The return of System.Net.Http assembly binding redirects

OpenId: Updating Microsoft.IdentityModel.Protocols packages to 5.7.0.0 too
OpenId: Updating Microsoft.IdentityModel.Tokens.* packages to version 5.7.0.0 to match Microsoft.IdentityModel.Tokens
2026-02-09 09:16:41 +08:00 · 2024-04-17 15:08:50 +02:00 · 2024-04-17 12:49:21 +02:00 · 2024-04-17 12:43:55 +02:00 · 2024-04-17 12:43:14 +02:00 · 2024-04-17 12:34:46 +02:00
339 changed files with 42173 additions and 49956 deletions
--- a/.github/workflows/compile.yml
+++ b/.github/workflows/compile.yml
@@ -1,4 +1,5 @@
 name: Compile
+# Compiles the solution and runs unit tests.

 on:
  workflow_dispatch:
@@ -9,22 +10,61 @@ on:
      - 1.10.x

 jobs:
-  compile:
-    name: Compile
+  compile-dotnet:
+    name: Compile .NET solution
    defaults:
      run:
        shell: pwsh
    runs-on: windows-latest
-
    steps:
      - name: Clone repository
-        uses: actions/checkout@v3.1.0
+        uses: actions/checkout@v4.1.1

      - name: Restore NuGet packages
        run: nuget restore src/Orchard.sln

      - name: Add msbuild to PATH
-        uses: microsoft/setup-msbuild@v1.3.1
+        uses: microsoft/setup-msbuild@v2

      - name: Compile
-        run: msbuild Orchard.proj /m /t:Compile /p:MvcBuildViews=true /p:TreatWarningsAsErrors=true -WarnAsError
+        run: msbuild Orchard.proj /m /v:minimal /t:Compile /p:MvcBuildViews=true /p:TreatWarningsAsErrors=true -WarnAsError
+
+      - name: Test
+        run: msbuild Orchard.proj /m /v:minimal /t:Test
+
+  compile-node:
+    name: Compile client-side assets
+    defaults:
+      run:
+        shell: pwsh
+    runs-on: windows-latest
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v4.1.1
+
+      - name: Setup NodeJS
+        uses: actions/setup-node@v4.0.2
+        with:
+          node-version: '7'
+
+      - name: Setup NPM packages
+        working-directory: ./src
+        run: |
+          npm install --loglevel warn
+
+          # Install gulp globally to be able to run the rebuild task, using the same version as in the project.
+          $gulpVersion = (Get-Content Package.json -Raw | ConvertFrom-Json).devDependencies.gulp
+          Start-Process npm -NoNewWindow -Wait -ArgumentList "install gulp@$gulpVersion -g --loglevel warn"
+
+      - name: Rebuild client-side assets
+        working-directory: ./src
+        run: |
+          gulp rebuild
+
+          git add . # To make line ending changes "disappear".
+          $gitStatus = (git status --porcelain)
+          if ($gitStatus)
+          {
+            throw ("Client-side assets are not up-to-date. Please run 'gulp rebuild' and commit the changes.`n" +
+              [System.String]::Join([System.Environment]::NewLine, $gitStatus))
+          }
--- a/.github/workflows/specflow.yml
+++ b/.github/workflows/specflow.yml
@@ -0,0 +1,39 @@
+name: SpecFlow tests
+# Compiles the solution and runs unit tests, as well the SpecFlow tests on the main development branches.
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron:  '0 0 * * *' # Every day at midnight.
+
+jobs:
+  compile:
+    name: SpecFlow tests
+    defaults:
+      run:
+        shell: pwsh
+    runs-on: windows-latest
+    strategy:
+      matrix:
+        branch: [dev, 1.10.x]
+
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+        with:
+          ref: ${{ matrix.branch }}
+
+      - name: Restore NuGet packages
+        run: nuget restore src/Orchard.sln
+
+      - name: Add msbuild to PATH
+        uses: microsoft/setup-msbuild@6fb02220983dee41ce7ae257b6f4d8f9bf5ed4ce # v2.0.0
+
+      - name: Compile
+        run: msbuild Orchard.proj /m /v:minimal /t:Compile /p:MvcBuildViews=true /p:TreatWarningsAsErrors=true -WarnAsError
+
+      - name: Test
+        run: msbuild Orchard.proj /m /v:minimal /t:Test
+
+      - name: Spec
+        run: msbuild Orchard.proj /m /v:minimal /t:Spec
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,7 @@
 ## Ignore Visual Studio temporary files, build results, and
 ## files generated by popular Visual Studio add-ons.
+**/.vs/**
+src/Rebracer.xml

 # User-specific files
 *.suo
@@ -190,5 +192,3 @@ src/Orchard.Azure/Orchard.Azure.CloudService/Staging/

 #enable all /lib artifacts
 !lib/**/*.*
-**/.vs/*
-src/Rebracer.xml
--- a/ClickToBuild.cmd
+++ b/ClickToBuild.cmd
@@ -3,36 +3,18 @@
 REM Necessary for the InstallDir variable to work inside the MsBuild-finding loop below.
 SETLOCAL ENABLEDELAYEDEXPANSION

-for /f "usebackq tokens=1* delims=: " %%i in (`lib\vswhere\vswhere -latest -version "[15.0,17.0)" -requires Microsoft.Component.MSBuild`) do (
+for /f "usebackq tokens=1* delims=: " %%i in (`lib\vswhere\vswhere -latest -version "[16.0,18.0)" -requires Microsoft.Component.MSBuild`) do (
  if /i "%%i"=="installationPath" (
 	set InstallDir=%%j
 	echo !InstallDir!
-	if exist "!InstallDir!\MSBuild\15.0\Bin\MSBuild.exe" (
-		echo "Using MSBuild from Visual Studio 2017"
-		set msbuild="!InstallDir!\MSBuild\15.0\Bin\MSBuild.exe"
-		goto build
-	)
 	if exist "!InstallDir!\MSBuild\Current\Bin\MSBuild.exe" (
-		echo "Using MSBuild from Visual Studio 2019"
+		echo "Using MSBuild from !InstallDir!"
 		set msbuild="!InstallDir!\MSBuild\Current\Bin\MSBuild.exe"
 		goto build
 	)
  )
 )

-FOR %%b in (
-       "%VS140COMNTOOLS%\vsvars32.bat"
-       "%VS120COMNTOOLS%\vsvars32.bat"
-       "%VS110COMNTOOLS%\vsvars32.bat"
-    ) do (
-    if exist %%b ( 
-		echo "Using MSBuild from %%b"
-		call %%b
-		set msbuild="msbuild"
-		goto build
-    )
-)
-
 echo "Unable to detect suitable environment. Build may not succeed."

 :build
--- a/Orchard.proj
+++ b/Orchard.proj
@@ -113,30 +113,26 @@
  </Target>
  
  <Target Name="Compile">
+    <CallTarget Targets="DevCompile"/>
    <!-- Compile to "OutputFolder" -->
    <MSBuild
      Projects="$(Solution)"
      Targets="Build"
-      Properties="Configuration=$(Configuration);OutputPath=$(CompileFolder);MvcBuildViews=false" />
+      Properties="Configuration=$(Configuration);OutputPath=$(CompileFolder)" />
+  </Target>
+  
+  <Target Name="DevCompile">
+    <!-- To make sure that Roslyn tools are available, since it's included with Orchard.Web, which is not referenced by
+    other projects, so it will be built towards the end. -->
+    <MSBuild
+      Projects="$(OrchardWebFolder)\Orchard.Web.csproj"
+      Targets="CopyRoslynCompilerFilesToOutputDirectory" />
    <!-- Compile to "regular" output folder for devs using VS locally -->
    <MSBuild
      Projects="$(Solution)"
      Targets="Build"
      Properties="Configuration=$(Configuration);MvcBuildViews=$(MvcBuildViews)" />
  </Target>
-  
-  <Target Name="BuildViews">
-    <!-- To make sure that Roslyn tools are available, even if the Compile task was not called before this. -->
-    <MSBuild
-      Projects="$(OrchardWebFolder)\Orchard.Web.csproj"
-      Targets="CopyRoslynFilesToOutputFolder"
-      Properties="Configuration=$(Configuration)" />
-    <!-- The actual compilation with views also compiled. -->
-    <MSBuild
-      Projects="$(Solution)"
-      Targets="Build"
-      Properties="Configuration=$(Configuration);MvcBuildViews=true" />
-  </Target>

  <Target Name="CompileMsBuildTasks">
    <MSBuild
@@ -195,7 +191,6 @@
      <Stage-Media Include="$(SrcFolder)\Orchard.Web\Media\OrchardLogo.png" />
      <Stage-PoFiles Include="$(SrcFolder)\Orchard.Web\**\*.po" />
      <Stage-Core Include="$(WebSitesFolder)\Orchard.Core\**\*" Exclude="$(WebSitesFolder)\Orchard.Core\**\bin\**\*" />
-      <Stage-Roslyn Include="$(SrcFolder)\Orchard.Web\bin\roslyn\*" />
     
      <!-- Get list of module names from the module definition files within ModulesSrcFolder -->
      <Stage-Modules-Definitions Include="$(ModulesSrcFolder)\**\Module.txt" />
@@ -237,7 +232,7 @@

    <!-- Copying module binaries is somewhat tricky: From a module "bin" directory, we
         only want to include the files that are _not_ already present in 
-         the "Orchard.Web\Bin" folder (except for "Orchard.Web\bin\roslyn"). -->
+         the "Orchard.Web\Bin" folder. -->
    <FilterModuleBinaries
      ModulesBinaries="@(Stage-Modules-Binaries)"
      OrchardWebBinaries="@(Stage-Orchard-Web-Bins)">
@@ -267,7 +262,6 @@
    <Copy SourceFiles="@(Stage-Themes-Custom)" DestinationFiles="@(Stage-Themes-Custom->'$(StageFolder)\Themes\%(ThemeName)\%(RecursiveDir)%(Filename)%(Extension)')"/>
    <Copy SourceFiles="@(Stage-Themes-Binaries-Unique)" DestinationFiles="@(Stage-Themes-Binaries-Unique->'$(StageFolder)\Themes\%(ThemeName)\%(RecursiveDir)%(Filename)%(Extension)')"/>
    <Copy SourceFiles="@(Stage-Themes-Sources)" DestinationFolder="$(StageFolder)\Themes\%(RecursiveDir)"/>
-    <Copy SourceFiles="@(Stage-Roslyn)" DestinationFolder="$(StageFolder)\bin\roslyn"/>

    <MakeDir Directories="$(StageFolder)\App_Data"/>
    <WriteLinesToFile File="$(StageFolder)\App_Data\_marker.txt" Lines="some_text" Overwrite="true"/>
--- a/lib/nuget/nuget.exe
+++ b/lib/nuget/nuget.exe
--- a/src/Gulpfile.js
+++ b/src/Gulpfile.js
@@ -222,7 +222,7 @@ function buildJsPipeline(assetGroup, doConcat, doRebuild) {
    // Source maps are useless if neither concatenating nor transpiling.
    if ((!doConcat || assetGroup.inputPaths.length < 2) && !assetGroup.inputPaths.some(function (inputPath) { return path.extname(inputPath).toLowerCase() === ".ts"; }))
        generateSourceMaps = false;
-    var typeScriptOptions = { allowJs: true, noImplicitAny: true, noEmitOnError: true };
+    var typeScriptOptions = { allowJs: true, noImplicitAny: true, noEmitOnError: true, module: 'amd' };
    if (assetGroup.typeScriptOptions)
        typeScriptOptions = Object.assign(typeScriptOptions, assetGroup.typeScriptOptions); // Merge override options from asset group if any.
    if (doConcat)
--- a/src/Orchard.Azure.Tests/Orchard.Azure.Tests.csproj
+++ b/src/Orchard.Azure.Tests/Orchard.Azure.Tests.csproj
@@ -11,6 +11,7 @@
    <RootNamespace>Orchard.Azure.Tests</RootNamespace>
    <AssemblyName>Orchard.Azure.Tests</AssemblyName>
    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
+    <LangVersion>7.3</LangVersion>
    <FileAlignment>512</FileAlignment>
    <FileUpgradeFlags>
    </FileUpgradeFlags>
@@ -41,7 +42,6 @@
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
@@ -52,7 +52,6 @@
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
--- a/src/Orchard.Core.Tests/Orchard.Core.Tests.csproj
+++ b/src/Orchard.Core.Tests/Orchard.Core.Tests.csproj
@@ -11,6 +11,7 @@
    <RootNamespace>Orchard.Core.Tests</RootNamespace>
    <AssemblyName>Orchard.Core.Tests</AssemblyName>
    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
+    <LangVersion>7.3</LangVersion>
    <FileAlignment>512</FileAlignment>
    <FileUpgradeFlags>
    </FileUpgradeFlags>
@@ -41,7 +42,6 @@
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>..\OrchardBasicCorrectness.ruleset</CodeAnalysisRuleSet>
    <PlatformTarget>AnyCPU</PlatformTarget>
    <Prefer32Bit>false</Prefer32Bit>
@@ -53,7 +53,6 @@
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
    <PlatformTarget>AnyCPU</PlatformTarget>
    <Prefer32Bit>false</Prefer32Bit>
--- a/src/Orchard.Profile/Orchard.Profile.csproj
+++ b/src/Orchard.Profile/Orchard.Profile.csproj
@@ -11,6 +11,7 @@
    <RootNamespace>Orchard.Profile</RootNamespace>
    <AssemblyName>Orchard.Profile</AssemblyName>
    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
+    <LangVersion>7.3</LangVersion>
    <FileAlignment>512</FileAlignment>
    <FileUpgradeFlags>
    </FileUpgradeFlags>
@@ -41,7 +42,6 @@
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <PlatformTarget>AnyCPU</PlatformTarget>
    <CodeAnalysisRuleSet>..\OrchardBasicCorrectness.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
@@ -53,7 +53,6 @@
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
--- a/src/Orchard.Specs/Hosting/Orchard.Web/Core/Web.config
+++ b/src/Orchard.Specs/Hosting/Orchard.Web/Core/Web.config
@@ -4,10 +4,9 @@
        <add key="webpages:Enabled" value="false" />
        <add key="aspnet:RoslynCompilerLocation" value="..\bin\roslyn" />
    </appSettings>
-    <!-- Registering Roslyn as a compiler for Razor IntelliSense. -->
    <system.codedom>
        <compilers>
-            <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:latest" />
+            <compiler language="c#;cs;csharp" extension=".cs" warningLevel="4" compilerOptions="/langversion:7.3 /nowarn:1659;1699;1701;612;618" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
        </compilers>
    </system.codedom>
    <system.web>
--- a/src/Orchard.Specs/Hosting/Orchard.Web/Themes/Web.config
+++ b/src/Orchard.Specs/Hosting/Orchard.Web/Themes/Web.config
@@ -4,10 +4,9 @@
        <add key="webpages:Enabled" value="false" />
        <add key="aspnet:RoslynCompilerLocation" value="..\bin\roslyn" />
    </appSettings>
-    <!-- Registering Roslyn as a compiler for Razor IntelliSense. -->
    <system.codedom>
        <compilers>
-            <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:latest" />
+            <compiler language="c#;cs;csharp" extension=".cs" warningLevel="4" compilerOptions="/langversion:7.3 /nowarn:1659;1699;1701;612;618" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
        </compilers>
    </system.codedom>
    <system.web>
--- a/src/Orchard.Specs/Hosting/Orchard.Web/Web.config
+++ b/src/Orchard.Specs/Hosting/Orchard.Web/Web.config
@@ -37,7 +37,7 @@
    <!-- Registering Roslyn as a compiler for Dynamic Compilation. -->
    <system.codedom>
        <compilers>
-            <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:latest" />
+            <compiler language="c#;cs;csharp" extension=".cs" warningLevel="4" compilerOptions="/langversion:7.3 /nowarn:1659;1699;1701;612;618" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
        </compilers>
    </system.codedom>
  <system.web>
@@ -164,7 +164,7 @@
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed" culture="neutral" />
-        <bindingRedirect oldVersion="0.0.0.0-12.0.0.0" newVersion="12.0.0.0" />
+        <bindingRedirect oldVersion="0.0.0.0-13.0.0.0" newVersion="13.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="NHibernate" publicKeyToken="aa95f207798dfdb4" culture="neutral" />
--- a/src/Orchard.Specs/Orchard.Specs.csproj
+++ b/src/Orchard.Specs/Orchard.Specs.csproj
@@ -11,6 +11,7 @@
    <RootNamespace>Orchard.Specs</RootNamespace>
    <AssemblyName>Orchard.Specs</AssemblyName>
    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
+    <LangVersion>7.3</LangVersion>
    <FileAlignment>512</FileAlignment>
    <FileUpgradeFlags>
    </FileUpgradeFlags>
@@ -41,7 +42,6 @@
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>..\OrchardBasicCorrectness.ruleset</CodeAnalysisRuleSet>
    <PlatformTarget>AnyCPU</PlatformTarget>
    <Prefer32Bit>false</Prefer32Bit>
@@ -53,7 +53,6 @@
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
    <PlatformTarget>AnyCPU</PlatformTarget>
    <Prefer32Bit>false</Prefer32Bit>
@@ -200,6 +199,11 @@
      <AutoGen>True</AutoGen>
      <DesignTime>True</DesignTime>
    </Compile>
+    <Compile Include="Settings.feature.cs">
+      <AutoGen>True</AutoGen>
+      <DesignTime>True</DesignTime>
+      <DependentUpon>Settings.feature</DependentUpon>
+    </Compile>
    <Compile Include="Text.feature.cs">
      <DependentUpon>Text.feature</DependentUpon>
      <AutoGen>True</AutoGen>
@@ -372,6 +376,10 @@
      <DependentUpon>HostComponents.config</DependentUpon>
    </None>
    <None Include="packages.config" />
+    <None Include="Settings.feature">
+      <Generator>SpecFlowSingleFileGenerator</Generator>
+      <LastGenOutput>Settings.feature.cs</LastGenOutput>
+    </None>
    <None Include="Text.feature">
      <Generator>SpecFlowSingleFileGenerator</Generator>
      <LastGenOutput>Text.feature.cs</LastGenOutput>
--- a/src/Orchard.Specs/Settings.feature
+++ b/src/Orchard.Specs/Settings.feature
@@ -0,0 +1,14 @@
+Feature: Settings
+
+In order to manage my site
+As a privileged user
+I want to be able to see and change site settings
+
+Scenario: Adding a new site culture and selecting it as the default works
+
+    Given I have installed Orchard
+    When I go to "Admin/Settings/Index"
+        Then I should not see "hu-HU"
+    When I have "hu-HU" as the default culture
+        And I go to "Admin/Settings/Index"
+        Then I should see "<option selected="selected">hu-HU</option>"
--- a/src/Orchard.Specs/Settings.feature.cs
+++ b/src/Orchard.Specs/Settings.feature.cs
@@ -0,0 +1,93 @@
+// ------------------------------------------------------------------------------
+//  <auto-generated>
+//      This code was generated by SpecFlow (http://www.specflow.org/).
+//      SpecFlow Version:1.9.0.77
+//      SpecFlow Generator Version:1.9.0.0
+//      Runtime Version:4.0.30319.42000
+// 
+//      Changes to this file may cause incorrect behavior and will be lost if
+//      the code is regenerated.
+//  </auto-generated>
+// ------------------------------------------------------------------------------
+#region Designer generated code
+#pragma warning disable
+namespace Orchard.Specs
+{
+    using TechTalk.SpecFlow;
+    
+    
+    [System.CodeDom.Compiler.GeneratedCodeAttribute("TechTalk.SpecFlow", "1.9.0.77")]
+    [System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    [NUnit.Framework.TestFixtureAttribute()]
+    [NUnit.Framework.DescriptionAttribute("Settings")]
+    public partial class SettingsFeature
+    {
+        
+        private static TechTalk.SpecFlow.ITestRunner testRunner;
+        
+#line 1 "Settings.feature"
+#line hidden
+        
+        [NUnit.Framework.TestFixtureSetUpAttribute()]
+        public virtual void FeatureSetup()
+        {
+            testRunner = TechTalk.SpecFlow.TestRunnerManager.GetTestRunner();
+            TechTalk.SpecFlow.FeatureInfo featureInfo = new TechTalk.SpecFlow.FeatureInfo(new System.Globalization.CultureInfo("en-US"), "Settings", "\r\nIn order to manage my site\r\nAs a privileged user\r\nI want to be able to see and " +
+                    "change site settings", ProgrammingLanguage.CSharp, ((string[])(null)));
+            testRunner.OnFeatureStart(featureInfo);
+        }
+        
+        [NUnit.Framework.TestFixtureTearDownAttribute()]
+        public virtual void FeatureTearDown()
+        {
+            testRunner.OnFeatureEnd();
+            testRunner = null;
+        }
+        
+        [NUnit.Framework.SetUpAttribute()]
+        public virtual void TestInitialize()
+        {
+        }
+        
+        [NUnit.Framework.TearDownAttribute()]
+        public virtual void ScenarioTearDown()
+        {
+            testRunner.OnScenarioEnd();
+        }
+        
+        public virtual void ScenarioSetup(TechTalk.SpecFlow.ScenarioInfo scenarioInfo)
+        {
+            testRunner.OnScenarioStart(scenarioInfo);
+        }
+        
+        public virtual void ScenarioCleanup()
+        {
+            testRunner.CollectScenarioErrors();
+        }
+        
+        [NUnit.Framework.TestAttribute()]
+        [NUnit.Framework.DescriptionAttribute("Adding a new site culture and selecting it as the default works")]
+        public virtual void AddingANewSiteCultureAndSelectingItAsTheDefaultWorks()
+        {
+            TechTalk.SpecFlow.ScenarioInfo scenarioInfo = new TechTalk.SpecFlow.ScenarioInfo("Adding a new site culture and selecting it as the default works", ((string[])(null)));
+#line 7
+this.ScenarioSetup(scenarioInfo);
+#line 9
+    testRunner.Given("I have installed Orchard", ((string)(null)), ((TechTalk.SpecFlow.Table)(null)), "Given ");
+#line 10
+    testRunner.When("I go to \"Admin/Settings/Index\"", ((string)(null)), ((TechTalk.SpecFlow.Table)(null)), "When ");
+#line 11
+        testRunner.Then("I should not see \"hu-HU\"", ((string)(null)), ((TechTalk.SpecFlow.Table)(null)), "Then ");
+#line 12
+    testRunner.When("I have \"hu-HU\" as the default culture", ((string)(null)), ((TechTalk.SpecFlow.Table)(null)), "When ");
+#line 13
+        testRunner.And("I go to \"Admin/Settings/Index\"", ((string)(null)), ((TechTalk.SpecFlow.Table)(null)), "And ");
+#line 14
+        testRunner.Then("I should see \"<option selected=\"selected\">hu-HU</option>\"", ((string)(null)), ((TechTalk.SpecFlow.Table)(null)), "Then ");
+#line hidden
+            this.ScenarioCleanup();
+        }
+    }
+}
+#pragma warning restore
+#endregion
--- a/src/Orchard.Tests.Modules/Email/EmailChannelTests.cs
+++ b/src/Orchard.Tests.Modules/Email/EmailChannelTests.cs
@@ -1,15 +1,9 @@
 using System.Collections.Generic;
 using Autofac;
-using Moq;
 using NUnit.Framework;
-using Orchard.ContentManagement.Records;
 using Orchard.DisplayManagement;
-using Orchard.Email.Services;
-using Orchard.Messaging.Events;
 using Orchard.Messaging.Services;
-using Orchard.Tests.Messaging;
 using Orchard.Tests.Modules.Stubs;
-using Orchard.Tests.Utility;

 namespace Orchard.Tests.Modules.Email {
    [TestFixture]
@@ -30,10 +24,10 @@ namespace Orchard.Tests.Modules.Email {
            var container = builder.Build();
            _messageService = container.Resolve<IMessageService>();
        }
-    
+
        [Test]
        public void CanSendEmailUsingAddresses() {
-            _messageService.Send("Email", new Dictionary<string, object>() { {"", null} });
+            _messageService.Send("Email", new Dictionary<string, object>() { { "", null } });
            Assert.That(_smtpChannel.Processed, Is.Not.Null);
        }

--- a/src/Orchard.Tests.Modules/Orchard.Tests.Modules.csproj
+++ b/src/Orchard.Tests.Modules/Orchard.Tests.Modules.csproj
@@ -11,6 +11,7 @@
    <RootNamespace>Orchard.Tests.Modules</RootNamespace>
    <AssemblyName>Orchard.Tests.Modules</AssemblyName>
    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
+    <LangVersion>7.3</LangVersion>
    <FileAlignment>512</FileAlignment>
    <FileUpgradeFlags>
    </FileUpgradeFlags>
@@ -41,7 +42,6 @@
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>..\OrchardBasicCorrectness.ruleset</CodeAnalysisRuleSet>
    <PlatformTarget>AnyCPU</PlatformTarget>
    <Prefer32Bit>false</Prefer32Bit>
@@ -53,7 +53,6 @@
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
    <PlatformTarget>AnyCPU</PlatformTarget>
    <Prefer32Bit>false</Prefer32Bit>
@@ -77,8 +76,8 @@
    <Reference Include="FluentPath, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
      <HintPath>..\packages\Orchard.FluentPath.1.0.0.1\lib\FluentPath.dll</HintPath>
    </Reference>
-    <Reference Include="ICSharpCode.SharpZipLib, Version=1.3.3.11, Culture=neutral, PublicKeyToken=1b03e6acf1164f73, processorArchitecture=MSIL">
-      <HintPath>..\packages\SharpZipLib.1.3.3\lib\net45\ICSharpCode.SharpZipLib.dll</HintPath>
+    <Reference Include="Iesi.Collections, Version=4.0.0.4000, Culture=neutral, PublicKeyToken=aa95f207798dfdb4, processorArchitecture=MSIL">
+      <HintPath>..\packages\Iesi.Collections.4.0.4\lib\net461\Iesi.Collections.dll</HintPath>
    </Reference>
    <Reference Include="IronRuby, Version=1.1.3.0, Culture=neutral, PublicKeyToken=7f709c5b713576e1, processorArchitecture=MSIL">
      <HintPath>..\packages\IronRuby.1.1.3\lib\IronRuby.dll</HintPath>
--- a/src/Orchard.Tests.Modules/Packaging/Services/Hello.World.csproj.txt
+++ b/src/Orchard.Tests.Modules/Packaging/Services/Hello.World.csproj.txt
@@ -13,7 +13,6 @@
    <RootNamespace>Hello.World</RootNamespace>
    <AssemblyName>Hello.World</AssemblyName>
    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
-    <MvcBuildViews>false</MvcBuildViews>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
    <DebugSymbols>true</DebugSymbols>
--- a/src/Orchard.Tests.Modules/Recipes/RecipeHandlers/ModuleStepTest.cs
+++ b/src/Orchard.Tests.Modules/Recipes/RecipeHandlers/ModuleStepTest.cs
@@ -19,6 +19,7 @@ using Orchard.Environment.Extensions.Models;
 using Orchard.Environment.Features;
 using Orchard.Environment.State;
 using Orchard.Events;
+using Orchard.Locking;
 using Orchard.Packaging.GalleryServer;
 using Orchard.Packaging.Models;
 using Orchard.Packaging.Services;
@@ -57,6 +58,7 @@ namespace Orchard.Tests.Modules.Recipes.RecipeHandlers {
            builder.RegisterType<RecipeExecutionLogger>().AsSelf();
            builder.RegisterType<ExtensionManager>().As<IExtensionManager>();
            builder.RegisterType<FeatureManager>().As<IFeatureManager>();
+            builder.RegisterType<LockingProvider>().As<ILockingProvider>();
            builder.RegisterType<StubCacheManager>().As<ICacheManager>();
            builder.RegisterType<StubParallelCacheContext>().As<IParallelCacheContext>();
            builder.RegisterType<StubAsyncTokenProvider>().As<IAsyncTokenProvider>();
@@ -65,6 +67,7 @@ namespace Orchard.Tests.Modules.Recipes.RecipeHandlers {
            builder.RegisterInstance(_packagesInRepository).As<IPackagingSourceManager>();
            builder.RegisterInstance(_packageManager).As<IPackageManager>();
            builder.RegisterType<ShellStateManager>().As<IShellStateManager>().SingleInstance();
+            builder.RegisterType<Signals>().As<ISignals>().SingleInstance();
            builder.RegisterType<StubEventBus>().As<IEventBus>().SingleInstance();
            builder.RegisterType<ModuleStep>();
            builder.RegisterSource(new EventsRegistrationSource());
--- a/src/Orchard.Tests.Modules/Recipes/RecipeHandlers/ThemeStepTest.cs
+++ b/src/Orchard.Tests.Modules/Recipes/RecipeHandlers/ThemeStepTest.cs
@@ -19,6 +19,7 @@ using Orchard.Environment.Features;
 using Orchard.Environment.State;
 using Orchard.Events;
 using Orchard.FileSystems.VirtualPath;
+using Orchard.Locking;
 using Orchard.Packaging.GalleryServer;
 using Orchard.Packaging.Services;
 using Orchard.Recipes.Models;
@@ -60,6 +61,7 @@ namespace Orchard.Tests.Modules.Recipes.RecipeHandlers {
            builder.RegisterType<RecipeExecutionLogger>().AsSelf();
            builder.RegisterType<ExtensionManager>().As<IExtensionManager>();
            builder.RegisterType<FeatureManager>().As<IFeatureManager>();
+            builder.RegisterType<LockingProvider>().As<ILockingProvider>();
            builder.RegisterType<StubCacheManager>().As<ICacheManager>();
            builder.RegisterType<StubParallelCacheContext>().As<IParallelCacheContext>();
            builder.RegisterType<StubAsyncTokenProvider>().As<IAsyncTokenProvider>();
@@ -71,6 +73,7 @@ namespace Orchard.Tests.Modules.Recipes.RecipeHandlers {
            builder.RegisterInstance(testVirtualPathProvider).As<IVirtualPathProvider>();
            builder.RegisterType<StubEventBus>().As<IEventBus>().SingleInstance();
            builder.RegisterType<ThemeService>().As<IThemeService>();
+            builder.RegisterType<Signals>().As<ISignals>().SingleInstance();
            builder.RegisterType<StubOrchardServices>().As<IOrchardServices>();
            builder.RegisterType<StubSiteThemeService>().As<ISiteThemeService>();
            builder.RegisterType<ThemeStep>();
--- a/src/Orchard.Tests.Modules/Settings/Blueprint/ShellDescriptorManagerTests.cs
+++ b/src/Orchard.Tests.Modules/Settings/Blueprint/ShellDescriptorManagerTests.cs
@@ -14,6 +14,7 @@ using Orchard.Environment.Descriptor.Models;
 using Orchard.Events;
 using Orchard.Caching;
 using Orchard.Core.Settings.State.Records;
+using Orchard.Locking;

 namespace Orchard.Tests.Modules.Settings.Blueprint {
    [TestFixture]
@@ -24,6 +25,8 @@ namespace Orchard.Tests.Modules.Settings.Blueprint {
            builder.RegisterType<DefaultCacheManager>().As<ICacheManager>();
            builder.RegisterType<DefaultCacheHolder>().As<ICacheHolder>().SingleInstance();
            builder.RegisterType<DefaultCacheContextAccessor>().As<ICacheContextAccessor>();
+            builder.RegisterType<LockingProvider>().As<ILockingProvider>();
+            builder.RegisterType<Signals>().As<ISignals>().SingleInstance();
            builder.RegisterType<ShellDescriptorManager>().As<IShellDescriptorManager>().SingleInstance();
            builder.RegisterType<ShellStateManager>().As<IShellStateManager>().SingleInstance();
            builder.RegisterType<StubEventBus>().As<IEventBus>().SingleInstance();
--- a/src/Orchard.Tests.Modules/Users/Controllers/AccountControllerTests.cs
+++ b/src/Orchard.Tests.Modules/Users/Controllers/AccountControllerTests.cs
@@ -71,6 +71,8 @@ namespace Orchard.Tests.Modules.Users.Controllers {
            builder.RegisterType<UserPartHandler>().As<IContentHandler>();
            builder.RegisterType<OrchardServices>().As<IOrchardServices>();
            builder.RegisterType<AccountValidationService>().As<IAccountValidationService>();
+            builder.RegisterType<PasswordService>().As<IPasswordService>();
+            builder.RegisterType<PasswordHistoryService>().As<IPasswordHistoryService>();

            builder.RegisterInstance(new Work<IEnumerable<IShapeTableEventHandler>>(resolve => _container.Resolve<IEnumerable<IShapeTableEventHandler>>())).AsSelf();
            builder.RegisterType<DefaultShapeTableManager>().As<IShapeTableManager>();
--- a/src/Orchard.Tests.Modules/Users/Services/MembershipServiceTests.cs
+++ b/src/Orchard.Tests.Modules/Users/Services/MembershipServiceTests.cs
@@ -68,6 +68,7 @@ namespace Orchard.Tests.Modules.Users.Services
            //builder.RegisterModule(new ImplicitCollectionSupportModule());
            builder.RegisterType<MembershipValidationService>().As<IMembershipValidationService>();
            builder.RegisterType<MembershipService>().As<IMembershipService>();
+            builder.RegisterType<PasswordService>().As<IPasswordService>();
            builder.RegisterType<DefaultContentQuery>().As<IContentQuery>();
            builder.RegisterType<DefaultContentManager>().As<IContentManager>();
            builder.RegisterType<StubCacheManager>().As<ICacheManager>();
@@ -77,7 +78,6 @@ namespace Orchard.Tests.Modules.Users.Services
            builder.RegisterType<DefaultContentManagerSession>().As<IContentManagerSession>();
            builder.RegisterInstance(new ShellSettings { Name = ShellSettings.DefaultName, DataProvider = "SqlCe" });
            builder.RegisterType<UserPartHandler>().As<IContentHandler>();
-            //builder.RegisterType<StubWorkContextAccessor>().As<IWorkContextAccessor>();
            builder.RegisterType<OrchardServices>().As<IOrchardServices>();
            builder.RegisterAutoMocking(MockBehavior.Loose);
            builder.RegisterGeneric(typeof(Repository<>)).As(typeof(IRepository<>));
@@ -135,11 +135,12 @@ namespace Orchard.Tests.Modules.Users.Services

        [Test]
        public void SaltAndPasswordShouldBeDifferentEvenWithSameSourcePassword() {
-            var user1 = _membershipService.CreateUser(new CreateUserParams("a", "b", "c", null, null, true, false));
+            var password = "Password1!";
+            var user1 = _membershipService.CreateUser(new CreateUserParams("user1", password, "user1@email.com", null, null, true, false));
            _session.Flush();
            _session.Clear();

-            var user2 = _membershipService.CreateUser(new CreateUserParams("d", "b", "e", null, null, true, false));
+            var user2 = _membershipService.CreateUser(new CreateUserParams("user2", password, "user2@email.com", null, null, true, false));
            _session.Flush();
            _session.Clear();

@@ -150,8 +151,8 @@ namespace Orchard.Tests.Modules.Users.Services
            Assert.That(user1Record.Password, Is.Not.EqualTo(user2Record.Password));

            List<LocalizedString> validationErrors;
-            Assert.That(_membershipService.ValidateUser("a", "b", out validationErrors), Is.Not.Null);
-            Assert.That(_membershipService.ValidateUser("d", "b", out validationErrors), Is.Not.Null);
+            Assert.That(_membershipService.ValidateUser("user1", password, out validationErrors), Is.Not.Null);
+            Assert.That(_membershipService.ValidateUser("user2", password, out validationErrors), Is.Not.Null);
        }

        [Test]
--- a/src/Orchard.Tests.Modules/packages.config
+++ b/src/Orchard.Tests.Modules/packages.config
@@ -20,5 +20,4 @@
  <package id="Orchard.NuGet.Core" version="1.1.0.0" targetFramework="net48" />
  <package id="Remotion.Linq" version="2.2.0" targetFramework="net48" />
  <package id="Remotion.Linq.EagerFetching" version="2.2.0" targetFramework="net48" />
-  <package id="SharpZipLib" version="1.3.1" targetFramework="net48" />
 </packages>
--- a/src/Orchard.Tests/ContentManagement/HqlExpressionTests.cs
+++ b/src/Orchard.Tests/ContentManagement/HqlExpressionTests.cs
@@ -106,7 +106,10 @@ namespace Orchard.Tests.ContentManagement {

        [Test]
        public void AllDataTypesCanBeQueried() {
-            var dt = DateTime.Now;
+            var now = DateTime.Now;
+            // NHibernate stores DateTime values with seconds-precision, so everything below that needs to be truncated
+            // so that the query works correctly. Thanks to https://stackoverflow.com/a/1005222 for elegant solution.
+            now = now.AddTicks(-(now.Ticks % TimeSpan.TicksPerSecond));

            _manager.Create<LambdaPart>("lambda", init => {
                init.Record.BooleanStuff = true;
@@ -116,7 +119,7 @@ namespace Orchard.Tests.ContentManagement {
                init.Record.IntegerStuff = 0;
                init.Record.LongStuff = 0;
                init.Record.StringStuff = "0";
-                init.Record.DateTimeStuff = dt;
+                init.Record.DateTimeStuff = now;
            });
            _session.Flush();

@@ -144,7 +147,7 @@ namespace Orchard.Tests.ContentManagement {
            lambda = _manager.HqlQuery().Where(alias => alias.ContentPartRecord<LambdaRecord>(), x => x.Eq("StringStuff", "0")).List();
            Assert.That(lambda.Count(), Is.EqualTo(1));

-            lambda = _manager.HqlQuery().Where(alias => alias.ContentPartRecord<LambdaRecord>(), x => x.Eq("DateTimeStuff", dt)).List();
+            lambda = _manager.HqlQuery().Where(alias => alias.ContentPartRecord<LambdaRecord>(), x => x.Eq("DateTimeStuff", now)).List();
            Assert.That(lambda.Count(), Is.EqualTo(1));
        }

@@ -940,31 +943,29 @@ namespace Orchard.Tests.ContentManagement {
        }

        [Test]
+        // This is a potentially flaky test, but failure due to randomness is extremely unlikely.
        public void ShouldSortRandomly() {
-            _manager.Create<LambdaPart>("lambda", init => {
-                init.Record.IntegerStuff = 1;
-            });
-
-            _manager.Create<LambdaPart>("lambda", init => {
-                init.Record.IntegerStuff = 2;
-            });
-
-            _manager.Create<LambdaPart>("lambda", init => {
-                init.Record.IntegerStuff = 3;
-            });
-            _session.Flush();
-
-            var result = _manager.HqlQuery().ForType("lambda").List();
-            Assert.That(result.Count(), Is.EqualTo(3));
-
-            var firstResults = new List<int>();
-
-            for (int i = 0; i < 10; i++) {
-                result = _manager.HqlQuery().Join(alias => alias.ContentPartRecord<LambdaRecord>()).OrderBy(x => x.Named("civ"), order => order.Random()).List();
-                firstResults.Add(result.First().As<LambdaPart>().Record.IntegerStuff);
+            var itemCount = 10;
+            for (int i = 0; i < itemCount; i++) {
+                _manager.Create<LambdaPart>("lambda", init => {
+                    init.Record.IntegerStuff = i;
+                });
            }

-            Assert.That(firstResults.Distinct().Count(), Is.GreaterThan(1));
+            _session.Flush();
+
+            var items = _manager.HqlQuery().ForType("lambda").List();
+            Assert.That(items.Count(), Is.EqualTo(itemCount));
+
+            var results = new List<string>();
+
+            for (int i = 0; i < 10; i++) {
+                items = _manager.HqlQuery().Join(alias =>
+                    alias.ContentPartRecord<LambdaRecord>()).OrderBy(x => x.Named("civ"), order => order.Random()).List();
+                results.Add(string.Join("", items.Select(item => item.As<LambdaPart>().Record.IntegerStuff)));
+            }
+
+            Assert.That(results.Distinct().Count(), Is.GreaterThan(1));
        }

        [Test]
--- a/src/Orchard.Tests/ContentManagement/XmlHelperTests.cs
+++ b/src/Orchard.Tests/ContentManagement/XmlHelperTests.cs
@@ -7,6 +7,8 @@ using Orchard.ContentManagement;
 namespace Orchard.Tests.ContentManagement {
    [TestFixture]
    public class XmlHelperTests {
+        private const string _testGuidString = "98f3dc0a-01c3-4975-bd52-1b4f5a678d73";
+
        [Test]
        public void AddEl() {
            var el = new XElement("data");
@@ -84,6 +86,14 @@ namespace Orchard.Tests.ContentManagement {
            Assert.That(el.Attribute("foo").Value, Is.EqualTo("1970-05-21T13:55:21.934Z"));
        }

+        [Test]
+        public void GuidToAttribute() {
+            var el = new XElement("data");
+            el.Attr("guid", new Guid(_testGuidString));
+
+            Assert.That(el.Attribute("guid").Value, Is.EqualTo(_testGuidString));
+        }
+
        [Test]
        public void DoubleFloatDecimalToAttribute() {
            var el = new XElement("data");
@@ -150,6 +160,14 @@ namespace Orchard.Tests.ContentManagement {
            Assert.That(el.Element("decimal").Value, Is.EqualTo("12.458"));
        }

+        [Test]
+        public void GuidToElement() {
+            var el = new XElement("data");
+            el.El("guid", new Guid(_testGuidString));
+
+            Assert.That(el.Element("guid").Value, Is.EqualTo(_testGuidString));
+        }
+
        [Test]
        public void ReadElement() {
            var el = XElement.Parse("<data><foo>bar</foo></data>");
@@ -168,12 +186,14 @@ namespace Orchard.Tests.ContentManagement {
                ADouble = 12.345D,
                AFloat = 23.456F,
                ADecimal = 34.567M,
+                AGuid = new Guid(_testGuidString),
                ANullableInt = 42,
                ANullableBoolean = true,
                ANullableDate = new DateTime(1970, 5, 21, 13, 55, 21, 934, DateTimeKind.Utc),
                ANullableDouble = 12.345D,
                ANullableFloat = 23.456F,
-                ANullableDecimal = 34.567M
+                ANullableDecimal = 34.567M,
+                ANullableGuid = new Guid(_testGuidString)
            };
            var el = new XElement("data");
            el.With(target)
@@ -184,12 +204,14 @@ namespace Orchard.Tests.ContentManagement {
                .ToAttr(t => t.ADouble)
                .ToAttr(t => t.AFloat)
                .ToAttr(t => t.ADecimal)
+                .ToAttr(t => t.AGuid)
                .ToAttr(t => t.ANullableInt)
                .ToAttr(t => t.ANullableBoolean)
                .ToAttr(t => t.ANullableDate)
                .ToAttr(t => t.ANullableDouble)
                .ToAttr(t => t.ANullableFloat)
-                .ToAttr(t => t.ANullableDecimal);
+                .ToAttr(t => t.ANullableDecimal)
+                .ToAttr(t => t.ANullableGuid);


            Assert.That(el.Attr("AString"), Is.EqualTo("foo"));
@@ -199,12 +221,14 @@ namespace Orchard.Tests.ContentManagement {
            Assert.That(el.Attr("ADouble"), Is.EqualTo("12.345"));
            Assert.That(el.Attr("AFloat"), Is.EqualTo("23.456"));
            Assert.That(el.Attr("ADecimal"), Is.EqualTo("34.567"));
+            Assert.That(el.Attr("AGuid"), Is.EqualTo(_testGuidString));
            Assert.That(el.Attr("ANullableInt"), Is.EqualTo("42"));
            Assert.That(el.Attr("ANullableBoolean"), Is.EqualTo("true"));
            Assert.That(el.Attr("ANullableDate"), Is.EqualTo("1970-05-21T13:55:21.934Z"));
            Assert.That(el.Attr("ANullableDouble"), Is.EqualTo("12.345"));
            Assert.That(el.Attr("ANullableFloat"), Is.EqualTo("23.456"));
            Assert.That(el.Attr("ANullableDecimal"), Is.EqualTo("34.567"));
+            Assert.That(el.Attr("ANullableGuid"), Is.EqualTo(_testGuidString));
        }

        [Test]
@@ -214,10 +238,10 @@ namespace Orchard.Tests.ContentManagement {
                XElement.Parse(
                    "<data AString=\"foo\" AnInt=\"42\" ABoolean=\"true\" " +
                    "ADate=\"1970-05-21T13:55:21.934Z\" ADouble=\"12.345\" " +
-                    "AFloat=\"23.456\" ADecimal=\"34.567\" " +
+                    $"AFloat=\"23.456\" ADecimal=\"34.567\" AGuid=\"{_testGuidString}\" " +
                    "ANullableInt=\"42\" ANullableBoolean=\"true\" " +
                    "ANullableDate=\"1970-05-21T13:55:21.934Z\" ANullableDouble=\"12.345\" " +
-                    "ANullableFloat=\"23.456\" ANullableDecimal=\"34.567\"/>");
+                    $"ANullableFloat=\"23.456\" ANullableDecimal=\"34.567\" ANullableGuid=\"{_testGuidString}\"/>");
            el.With(target)
                .FromAttr(t => t.AString)
                .FromAttr(t => t.AnInt)
@@ -226,12 +250,14 @@ namespace Orchard.Tests.ContentManagement {
                .FromAttr(t => t.ADouble)
                .FromAttr(t => t.AFloat)
                .FromAttr(t => t.ADecimal)
+                .FromAttr(t => t.AGuid)
                .FromAttr(t => t.ANullableInt)
                .FromAttr(t => t.ANullableBoolean)
                .FromAttr(t => t.ANullableDate)
                .FromAttr(t => t.ANullableDouble)
                .FromAttr(t => t.ANullableFloat)
-                .FromAttr(t => t.ANullableDecimal);
+                .FromAttr(t => t.ANullableDecimal)
+                .FromAttr(t => t.ANullableGuid);

            Assert.That(target.AString, Is.EqualTo("foo"));
            Assert.That(target.AnInt, Is.EqualTo(42));
@@ -240,12 +266,14 @@ namespace Orchard.Tests.ContentManagement {
            Assert.That(target.ADouble, Is.EqualTo(12.345D));
            Assert.That(target.AFloat, Is.EqualTo(23.456F));
            Assert.That(target.ADecimal, Is.EqualTo(34.567M));
+            Assert.That(target.AGuid, Is.EqualTo(new Guid(_testGuidString)));
            Assert.That(target.ANullableInt, Is.EqualTo(42));
            Assert.That(target.ANullableBoolean, Is.True);
            Assert.That(target.ANullableDate, Is.EqualTo(new DateTime(1970, 5, 21, 13, 55, 21, 934, DateTimeKind.Utc)));
            Assert.That(target.ANullableDouble, Is.EqualTo(12.345D));
            Assert.That(target.ANullableFloat, Is.EqualTo(23.456F));
            Assert.That(target.ANullableDecimal, Is.EqualTo(34.567M));
+            Assert.That(target.ANullableGuid, Is.EqualTo(new Guid(_testGuidString)));
        }

        [Test]
@@ -258,12 +286,14 @@ namespace Orchard.Tests.ContentManagement {
                ADouble = 12.345D,
                AFloat = 23.456F,
                ADecimal = 34.567M,
+                AGuid = new Guid(_testGuidString),
                ANullableInt = 42,
                ANullableBoolean = true,
                ANullableDate = new DateTime(1970, 5, 21, 13, 55, 21, 934, DateTimeKind.Utc),
                ANullableDouble = 12.345D,
                ANullableFloat = 23.456F,
-                ANullableDecimal = 34.567M
+                ANullableDecimal = 34.567M,
+                ANullableGuid = new Guid(_testGuidString)
            };
            var el = new XElement("data");
            el.With(target)
@@ -274,12 +304,14 @@ namespace Orchard.Tests.ContentManagement {
                .FromAttr(t => t.ADouble)
                .FromAttr(t => t.AFloat)
                .FromAttr(t => t.ADecimal)
+                .FromAttr(t => t.AGuid)
                .FromAttr(t => t.ANullableInt)
                .FromAttr(t => t.ANullableBoolean)
                .FromAttr(t => t.ANullableDate)
                .FromAttr(t => t.ANullableDouble)
                .FromAttr(t => t.ANullableFloat)
-                .FromAttr(t => t.ANullableDecimal);
+                .FromAttr(t => t.ANullableDecimal)
+                .FromAttr(t => t.ANullableGuid);

            Assert.That(target.AString, Is.EqualTo("foo"));
            Assert.That(target.AnInt, Is.EqualTo(42));
@@ -288,12 +320,14 @@ namespace Orchard.Tests.ContentManagement {
            Assert.That(target.ADouble, Is.EqualTo(12.345D));
            Assert.That(target.AFloat, Is.EqualTo(23.456F));
            Assert.That(target.ADecimal, Is.EqualTo(34.567M));
+            Assert.That(target.AGuid, Is.EqualTo(new Guid(_testGuidString)));
            Assert.That(target.ANullableInt, Is.EqualTo(42));
            Assert.That(target.ANullableBoolean, Is.True);
            Assert.That(target.ANullableDate, Is.EqualTo(new DateTime(1970, 5, 21, 13, 55, 21, 934, DateTimeKind.Utc)));
            Assert.That(target.ANullableDouble, Is.EqualTo(12.345D));
            Assert.That(target.ANullableFloat, Is.EqualTo(23.456F));
            Assert.That(target.ANullableDecimal, Is.EqualTo(34.567M));
+            Assert.That(target.ANullableGuid, Is.EqualTo(new Guid(_testGuidString)));
        }

        [Test]
@@ -339,7 +373,8 @@ namespace Orchard.Tests.ContentManagement {
                .ToAttr(t => t.ANullableDate)
                .ToAttr(t => t.ANullableDouble)
                .ToAttr(t => t.ANullableFloat)
-                .ToAttr(t => t.ANullableDecimal);
+                .ToAttr(t => t.ANullableDecimal)
+                .ToAttr(t => t.ANullableGuid);

            Assert.That(el.Attr("AString"), Is.EqualTo(""));
            Assert.That(el.Attr("ANullableInt"), Is.EqualTo("null"));
@@ -348,6 +383,7 @@ namespace Orchard.Tests.ContentManagement {
            Assert.That(el.Attr("ANullableDouble"), Is.EqualTo("null"));
            Assert.That(el.Attr("ANullableFloat"), Is.EqualTo("null"));
            Assert.That(el.Attr("ANullableDecimal"), Is.EqualTo("null"));
+            Assert.That(el.Attr("ANullableGuid"), Is.EqualTo("null"));
        }

        [Test]
@@ -357,7 +393,7 @@ namespace Orchard.Tests.ContentManagement {
                XElement.Parse(
                    "<data AString=\"null\" ANullableInt=\"null\" ANullableBoolean=\"null\" " +
                    "ANullableDate=\"null\" ANullableDouble=\"null\" " +
-                    "ANullableFloat=\"null\" ANullableDecimal=\"null\"/>");
+                    "ANullableFloat=\"null\" ANullableDecimal=\"null\" ANullableGuid=\"null\"/>");
            el.With(target)
                .FromAttr(t => t.AString)
                .FromAttr(t => t.ANullableInt)
@@ -365,7 +401,8 @@ namespace Orchard.Tests.ContentManagement {
                .FromAttr(t => t.ANullableDate)
                .FromAttr(t => t.ANullableDouble)
                .FromAttr(t => t.ANullableFloat)
-                .FromAttr(t => t.ANullableDecimal);
+                .FromAttr(t => t.ANullableDecimal)
+                .FromAttr(t => t.ANullableGuid);

            Assert.That(target.AString, Is.EqualTo("null"));
            Assert.That(target.ANullableInt, Is.Null);
@@ -374,6 +411,7 @@ namespace Orchard.Tests.ContentManagement {
            Assert.That(target.ANullableDouble, Is.Null);
            Assert.That(target.ANullableFloat, Is.Null);
            Assert.That(target.ANullableDecimal, Is.Null);
+            Assert.That(target.ANullableGuid, Is.Null);
        }

        private class Target {
@@ -384,12 +422,14 @@ namespace Orchard.Tests.ContentManagement {
            public double ADouble { get; set; }
            public float AFloat { get; set; }
            public decimal ADecimal { get; set; }
+            public Guid AGuid { get; set; }
            public int? ANullableInt { get; set; }
            public bool? ANullableBoolean { get; set; }
            public DateTime? ANullableDate { get; set; }
            public double? ANullableDouble { get; set; }
            public float? ANullableFloat { get; set; }
            public decimal? ANullableDecimal { get; set; }
+            public Guid? ANullableGuid { get; set; }
        }
    }
 }
--- a/src/Orchard.Tests/DisplayManagement/Descriptors/StylesheetBindingStrategyTests.cs
+++ b/src/Orchard.Tests/DisplayManagement/Descriptors/StylesheetBindingStrategyTests.cs
@@ -8,10 +8,13 @@ using NUnit.Framework;
 using Orchard.DisplayManagement.Descriptors;
 using Orchard.DisplayManagement.Descriptors.ResourceBindingStrategy;
 using Orchard.DisplayManagement.Descriptors.ShapeTemplateStrategy;
+using Orchard.Environment;
 using Orchard.Environment.Descriptor.Models;
 using Orchard.Environment.Extensions;
 using Orchard.Environment.Extensions.Models;
 using Orchard.FileSystems.VirtualPath;
+using Orchard.Tests.Localization;
+using Orchard.UI.Resources;

 namespace Orchard.Tests.DisplayManagement.Descriptors {
    [TestFixture]
@@ -29,8 +32,10 @@ namespace Orchard.Tests.DisplayManagement.Descriptors {

            builder.Register(ctx => _descriptor);
            builder.RegisterType<StylesheetBindingStrategy>().As<IShapeTableProvider>();
+            builder.RegisterType<ResourceFileHashProvider>().As<IResourceFileHashProvider>();
            builder.RegisterInstance(_testViewEngine).As<IShapeTemplateViewEngine>();
            builder.RegisterInstance(_testVirtualPathProvider).As<IVirtualPathProvider>();
+            builder.RegisterInstance(new Work<WorkContext>(resolve => new StubWorkContext())).AsSelf();

            var extensionManager = new Mock<IExtensionManager>();
            builder.Register(ctx => extensionManager);
--- a/src/Orchard.Tests/Environment/Features/FeatureManagerTests.cs
+++ b/src/Orchard.Tests/Environment/Features/FeatureManagerTests.cs
@@ -16,6 +16,7 @@ using Orchard.Environment.Extensions.Folders;
 using Orchard.Environment.Features;
 using Orchard.Environment.State;
 using Orchard.Events;
+using Orchard.Locking;
 using Orchard.Tests.Environment.Extensions;
 using Orchard.Tests.Stubs;

@@ -27,10 +28,10 @@ namespace Orchard.Tests.Environment.Features {
        protected override IEnumerable<Type> DatabaseTypes {
            get {
                return new[] {
-                                 typeof (ShellDescriptorRecord),
-                                 typeof (ShellFeatureRecord),
-                                 typeof (ShellParameterRecord),
-                             };
+                    typeof (ShellDescriptorRecord),
+                    typeof (ShellFeatureRecord),
+                    typeof (ShellParameterRecord),
+                };
            }
        }

@@ -39,11 +40,13 @@ namespace Orchard.Tests.Environment.Features {
            builder.RegisterInstance(_folders).As<IExtensionFolders>();
            builder.RegisterType<ExtensionManager>().As<IExtensionManager>();
            builder.RegisterType<FeatureManager>().As<IFeatureManager>();
+            builder.RegisterType<LockingProvider>().As<ILockingProvider>();
            builder.RegisterType<StubCacheManager>().As<ICacheManager>();
            builder.RegisterType<StubParallelCacheContext>().As<IParallelCacheContext>();
            builder.RegisterType<StubAsyncTokenProvider>().As<IAsyncTokenProvider>();
            builder.RegisterType<ShellDescriptorManager>().As<IShellDescriptorManager>().SingleInstance();
            builder.RegisterType<ShellStateManager>().As<IShellStateManager>().SingleInstance();
+            builder.RegisterType<Signals>().As<ISignals>().SingleInstance();
            builder.RegisterType<StubEventBus>().As<IEventBus>().SingleInstance();
            builder.RegisterSource(new EventsRegistrationSource());

--- a/src/Orchard.Tests/Localization/TextTests.cs
+++ b/src/Orchard.Tests/Localization/TextTests.cs
@@ -1,12 +1,11 @@
-using Autofac;
+using System.Collections.Generic;
+using System.Web;
+using Autofac;
 using Moq;
 using NUnit.Framework;
 using Orchard.Localization;
 using Orchard.Localization.Services;
-using Orchard.Mvc;
 using Orchard.Tests.Stubs;
-using System.Collections.Generic;
-using System.Web;

 namespace Orchard.Tests.Localization {
    [TestFixture]
@@ -18,7 +17,7 @@ namespace Orchard.Tests.Localization {
        public void Init() {
            var mockLocalizedManager = new Mock<ILocalizedStringManager>();
            mockLocalizedManager
-                .Setup(x => x.GetLocalizedString(new List<string> { It.IsAny<string>() }, It.IsAny<string>(), It.IsAny<string>()))
+                .Setup(x => x.GetLocalizedString(It.IsAny<IEnumerable<string>>(), It.IsAny<string>(), It.IsAny<string>()))
                .Returns(new FormatForScope("foo {0}", null));

            var builder = new ContainerBuilder();
@@ -38,8 +37,7 @@ namespace Orchard.Tests.Localization {
        }

        [Test]
-        public void TextDoesEncodeHtmlEncodedArguments()
-        {
+        public void TextDoesEncodeHtmlEncodedArguments() {
            Assert.That(_text.Get("foo {0}", new HtmlString("bar")).Text, Is.EqualTo("foo bar"));
            Assert.That(_text.Get("foo {0}", new HtmlString("<bar>")).Text, Is.EqualTo("foo <bar>"));
        }
--- a/src/Orchard.Tests/Orchard.Framework.Tests.csproj
+++ b/src/Orchard.Tests/Orchard.Framework.Tests.csproj
@@ -12,6 +12,7 @@
    <RootNamespace>Orchard.Tests</RootNamespace>
    <AssemblyName>Orchard.Framework.Tests</AssemblyName>
    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
+    <LangVersion>7.3</LangVersion>
    <FileAlignment>512</FileAlignment>
    <FileUpgradeFlags>
    </FileUpgradeFlags>
@@ -44,7 +45,6 @@
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>..\OrchardBasicCorrectness.ruleset</CodeAnalysisRuleSet>
    <PlatformTarget>AnyCPU</PlatformTarget>
    <Prefer32Bit>false</Prefer32Bit>
@@ -56,7 +56,6 @@
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
    <PlatformTarget>AnyCPU</PlatformTarget>
    <Prefer32Bit>false</Prefer32Bit>
@@ -142,7 +141,6 @@
      <HintPath>..\..\lib\sqlce\System.Data.SqlServerCe.dll</HintPath>
      <Private>True</Private>
    </Reference>
-    <Reference Include="System.Net.Http, Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
    <Reference Include="System.Net.Http.Formatting, Version=5.2.7.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
      <HintPath>..\packages\Microsoft.AspNet.WebApi.Client.5.2.7\lib\net45\System.Net.Http.Formatting.dll</HintPath>
    </Reference>
--- a/src/Orchard.Tests/UI/Resources/ResourceManagerTests.cs
+++ b/src/Orchard.Tests/UI/Resources/ResourceManagerTests.cs
@@ -13,7 +13,7 @@ namespace Orchard.Tests.UI.Resources {
        private IResourceManager _resourceManager;
        private IResourceFileHashProvider _resourceFileHashProvider;
        private TestManifestProvider _testManifest;
-        private string _appPath = "/AppPath/";
+        private readonly string _appPath = "/AppPath/";

        private class TestManifestProvider : IResourceManifestProvider {
            public Action<ResourceManifest> DefineManifest { get; set; }
@@ -30,10 +30,6 @@ namespace Orchard.Tests.UI.Resources {
        }

        private void VerifyPaths(string resourceType, RequireSettings defaultSettings, string expectedPaths) {
-            VerifyPaths(resourceType, defaultSettings, expectedPaths, false);
-        }
-
-        private void VerifyPaths(string resourceType, RequireSettings defaultSettings, string expectedPaths, bool ssl) {
            defaultSettings = defaultSettings ?? new RequireSettings();
            var requiredResources = _resourceManager.BuildRequiredResources(resourceType);
            var renderedResources = string.Join(",", requiredResources.Select(context => context
@@ -57,90 +53,68 @@ namespace Orchard.Tests.UI.Resources {

        [Test]
        public void ReleasePathIsTheDefaultPath() {
-            _testManifest.DefineManifest = m => {
-                m.DefineResource("script", "Script1").SetUrl("script1.min.js", "script1.js");
-            };
+            _testManifest.DefineManifest = m => m.DefineResource("script", "Script1").SetUrl("script1.min.js", "script1.js");
            _resourceManager.Require("script", "Script1");
            VerifyPaths("script", null, "script1.min.js");
        }

        [Test]
        public void DebugPathIsUsedWithDebugMode() {
-            _testManifest.DefineManifest = m => {
-                m.DefineResource("script", "Script1").SetUrl("script1.min.js", "script1.js");
-            };
+            _testManifest.DefineManifest = m => m.DefineResource("script", "Script1").SetUrl("script1.min.js", "script1.js");
            _resourceManager.Require("script", "Script1");
            VerifyPaths("script", new RequireSettings { DebugMode = true }, "script1.js");
        }

        [Test]
        public void ReleasePathIsUsedWhenNoDebugPath() {
-            _testManifest.DefineManifest = m => {
-                m.DefineResource("script", "Script1").SetUrl("script1.min.js");
-            };
+            _testManifest.DefineManifest = m => m.DefineResource("script", "Script1").SetUrl("script1.min.js");
            _resourceManager.Require("script", "Script1");
            VerifyPaths("script", new RequireSettings { DebugMode = true }, "script1.min.js");
        }

        [Test]
        public void DefaultSettingsAreOverriddenByUseDebugMode() {
-            _testManifest.DefineManifest = m => {
-                m.DefineResource("script", "Script1").SetUrl("script1.min.js", "script1.js");
-            };
+            _testManifest.DefineManifest = m => m.DefineResource("script", "Script1").SetUrl("script1.min.js", "script1.js");
            _resourceManager.Require("script", "Script1").UseDebugMode();
            VerifyPaths("script", new RequireSettings { DebugMode = false }, "script1.js");
        }

        [Test]
        public void CdnPathIsUsedInCdnMode() {
-            _testManifest.DefineManifest = m => {
-                m.DefineResource("script", "Script1").SetUrl("script1.js").SetCdn("http://cdn/script1.min.js");
-            };
+            _testManifest.DefineManifest = m => m
+                .DefineResource("script", "Script1")
+                .SetUrl("script1.js")
+                .SetCdn("http://cdn/script1.min.js");
            _resourceManager.Require("script", "Script1");
            VerifyPaths("script", new RequireSettings { CdnMode = true }, "http://cdn/script1.min.js");
        }

        [Test]
        public void CdnSslPathIsUsedInCdnMode() {
-            _testManifest.DefineManifest = m => {
-                m.DefineResource("script", "Script1").SetUrl("script1.js").SetCdn("https://cdn/script1.min.js");
-            };
+            _testManifest.DefineManifest = m => m
+                .DefineResource("script", "Script1")
+                .SetUrl("script1.js")
+                .SetCdn("https://cdn/script1.min.js");
            _resourceManager.Require("script", "Script1");
-            VerifyPaths("script", new RequireSettings { CdnMode = true }, "https://cdn/script1.min.js", true);
-        }
-
-        [Test]
-        public void LocalPathIsUsedInCdnModeNotSupportsSsl() {
-            _testManifest.DefineManifest = m => {
-                m.DefineResource("script", "Script1").SetUrl("script1.min.js", "script1.js").SetCdn("http://cdn/script1.min.js", "http://cdn/script1.js");
-            };
-            _resourceManager.Require("script", "Script1");
-            VerifyPaths("script", new RequireSettings { CdnMode = true }, "script1.min.js", true);
-        }
-
-        [Test]
-        public void LocalDebugPathIsUsedInCdnModeNotSupportsSslAndDebug() {
-            _testManifest.DefineManifest = m => {
-                m.DefineResource("script", "Script1").SetUrl("script1.min.js", "script1.js").SetCdn("http://cdn/script1.min.js", "http://cdn/script1.js");
-            };
-            _resourceManager.Require("script", "Script1");
-            VerifyPaths("script", new RequireSettings { CdnMode = true, DebugMode = true }, "script1.js", true);
+            VerifyPaths("script", new RequireSettings { CdnMode = true }, "https://cdn/script1.min.js");
        }

        [Test]
        public void CdnDebugPathIsUsedInCdnModeAndDebugMode() {
-            _testManifest.DefineManifest = m => {
-                m.DefineResource("script", "Script1").SetUrl("script1.js").SetCdn("http://cdn/script1.min.js", "http://cdn/script1.js");
-            };
+            _testManifest.DefineManifest = m => m
+                .DefineResource("script", "Script1")
+                .SetUrl("script1.js")
+                .SetCdn("http://cdn/script1.min.js", "http://cdn/script1.js");
            _resourceManager.Require("script", "Script1");
            VerifyPaths("script", new RequireSettings { CdnMode = true, DebugMode = true }, "http://cdn/script1.js");
        }

        [Test]
        public void DebugPathIsUsedInCdnModeAndDebugModeAndThereIsNoCdnDebugPath() {
-            _testManifest.DefineManifest = m => {
-                m.DefineResource("script", "Script1").SetUrl("script1.min.js", "script1.js").SetCdn("http://cdn/script1.min.js");
-            };
+            _testManifest.DefineManifest = m => m
+                .DefineResource("script", "Script1")
+                .SetUrl("script1.min.js", "script1.js")
+                .SetCdn("http://cdn/script1.min.js");
            _resourceManager.Require("script", "Script1");
            VerifyPaths("script", new RequireSettings { CdnMode = true, DebugMode = true }, "script1.js");
        }
--- a/src/Orchard.WarmupStarter/Orchard.WarmupStarter.csproj
+++ b/src/Orchard.WarmupStarter/Orchard.WarmupStarter.csproj
@@ -11,6 +11,7 @@
    <RootNamespace>Orchard.WarmupStarter</RootNamespace>
    <AssemblyName>Orchard.WarmupStarter</AssemblyName>
    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
+    <LangVersion>7.3</LangVersion>
    <FileAlignment>512</FileAlignment>
    <TargetFrameworkProfile />
  </PropertyGroup>
@@ -22,7 +23,6 @@
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <Prefer32Bit>false</Prefer32Bit>
    <UseVSHostingProcess>false</UseVSHostingProcess>
    <CodeAnalysisRuleSet>..\OrchardBasicCorrectness.ruleset</CodeAnalysisRuleSet>
@@ -34,7 +34,6 @@
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
  <ItemGroup>
--- a/src/Orchard.Web.Tests/Orchard.Web.Tests.csproj
+++ b/src/Orchard.Web.Tests/Orchard.Web.Tests.csproj
@@ -11,6 +11,7 @@
    <RootNamespace>Orchard.Web.Tests</RootNamespace>
    <AssemblyName>Orchard.Web.Tests</AssemblyName>
    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
+    <LangVersion>7.3</LangVersion>
    <FileAlignment>512</FileAlignment>
    <FileUpgradeFlags>
    </FileUpgradeFlags>
@@ -41,7 +42,6 @@
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>..\OrchardBasicCorrectness.ruleset</CodeAnalysisRuleSet>
    <PlatformTarget>AnyCPU</PlatformTarget>
    <Prefer32Bit>false</Prefer32Bit>
@@ -53,7 +53,6 @@
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
--- a/src/Orchard.Web/Core/Common/Drivers/TextFieldDriver.cs
+++ b/src/Orchard.Web/Core/Common/Drivers/TextFieldDriver.cs
@@ -10,6 +10,7 @@ using Orchard.Core.Common.Settings;
 using Orchard.Core.Common.ViewModels;
 using Orchard.Localization;
 using Orchard.Services;
+using Orchard.Utility.Extensions;

 namespace Orchard.Core.Common.Drivers {
    public class TextFieldDriver : ContentFieldDriver<TextField> {
@@ -71,6 +72,16 @@ namespace Orchard.Core.Common.Drivers {
                if (settings.Required && String.IsNullOrWhiteSpace(field.Value)) {
                    updater.AddModelError("Text", T("The {0} field is required.", T(field.DisplayName)));
                }
+
+                if (settings.MaxLength > 0) {
+
+                    var value = new HtmlString(_htmlFilters.Aggregate(field.Value, (text, filter) => filter.ProcessContent(text, settings.Flavor)))
+                        .ToString().RemoveTags();
+
+                    if (value.Length > settings.MaxLength) {
+                        updater.AddModelError("Text", T("The maximum allowed length for the field {0} is {1}", T(field.DisplayName), settings.MaxLength));
+                    }                    
+                }
            }

            return Editor(part, field, shapeHelper);
--- a/src/Orchard.Web/Core/Common/Settings/TextFieldSettings.cs
+++ b/src/Orchard.Web/Core/Common/Settings/TextFieldSettings.cs
@@ -1,4 +1,5 @@
-using System.ComponentModel.DataAnnotations;
+using System.ComponentModel;
+using System.ComponentModel.DataAnnotations;

 namespace Orchard.Core.Common.Settings {

@@ -9,5 +10,8 @@ namespace Orchard.Core.Common.Settings {
        public string Hint { get; set; }
        public string Placeholder { get; set; }
        public string DefaultValue { get; set; }
+        [Range(0, int.MaxValue)]
+        [DisplayName("Maximum Length")]
+        public int MaxLength { get; set; }
    }
 }
--- a/src/Orchard.Web/Core/Common/Settings/TextFieldSettingsEvents.cs
+++ b/src/Orchard.Web/Core/Common/Settings/TextFieldSettingsEvents.cs
@@ -35,9 +35,10 @@ namespace Orchard.Core.Common.Settings {
                builder.WithSetting("TextFieldSettings.Required", model.Settings.Required.ToString(CultureInfo.InvariantCulture));
                builder.WithSetting("TextFieldSettings.Placeholder", model.Settings.Placeholder);
                builder.WithSetting("TextFieldSettings.DefaultValue", model.Settings.DefaultValue);
-
-                yield return DefinitionTemplate(model);
+                builder.WithSetting("TextFieldSettings.MaxLength", model.Settings.MaxLength.ToString());               
            }
+
+            yield return DefinitionTemplate(model);
        }
    }
 }
--- a/src/Orchard.Web/Core/Common/Views/Body-Large.Editor.cshtml
+++ b/src/Orchard.Web/Core/Common/Views/Body-Large.Editor.cshtml
@@ -1,9 +1,12 @@
@{
    var propertyName = Model.PropertyName != null ? (string)Model.PropertyName : "Text";
+    var htmlAttributes = (Dictionary<string, object>)Model.HtmlAttributes;

-    var htmlAttributes = new Dictionary<string, object> {
-        {"class", "text large"}
-    };
+    if (htmlAttributes == null) {
+        htmlAttributes = new Dictionary<string, object> {
+            {"class", "text large"}
+        };
+    }

    if (Model.Required == true) {
        htmlAttributes["required"] = "required";
--- a/src/Orchard.Web/Core/Common/Views/Body-Small.Editor.cshtml
+++ b/src/Orchard.Web/Core/Common/Views/Body-Small.Editor.cshtml
@@ -1,9 +1,12 @@
@{
    var propertyName = Model.PropertyName != null ? (string)Model.PropertyName : "Text";
+    var htmlAttributes = (Dictionary<string, object>)Model.HtmlAttributes;

-    var htmlAttributes = new Dictionary<string, object> {
-        {"class", "text small"}
-    };
+    if (htmlAttributes == null) {
+        htmlAttributes = new Dictionary<string, object> {
+            {"class", "text small"}
+        };
+    }

    if (Model.Required == true) {
        htmlAttributes["required"] = "required";
--- a/src/Orchard.Web/Core/Common/Views/Body-Textarea.Editor.cshtml
+++ b/src/Orchard.Web/Core/Common/Views/Body-Textarea.Editor.cshtml
@@ -1,7 +1,10 @@
@{
    var propertyName = Model.PropertyName != null ? (string)Model.PropertyName : "Text";
+    var htmlAttributes = (Dictionary<string, object>)Model.HtmlAttributes;

-    var htmlAttributes = new Dictionary<string, object>();
+    if (htmlAttributes == null) {
+        htmlAttributes = new Dictionary<string, object>();
+    }

    if (Model.Required == true) {
        htmlAttributes["required"] = "required";
--- a/src/Orchard.Web/Core/Common/Views/Body-Wide.Editor.cshtml
+++ b/src/Orchard.Web/Core/Common/Views/Body-Wide.Editor.cshtml
@@ -1,9 +1,12 @@
@{
    var propertyName = Model.PropertyName != null ? (string)Model.PropertyName : "Text";
+    var htmlAttributes = (Dictionary<string, object>)Model.HtmlAttributes;

-    var htmlAttributes = new Dictionary<string, object> {
-        {"class", "text medium"}
-    };
+    if (htmlAttributes == null) {
+        htmlAttributes = new Dictionary<string, object> {
+            {"class", "text medium"}
+        };
+    }

    if (Model.Required == true) {
        htmlAttributes["required"] = "required";
--- a/src/Orchard.Web/Core/Common/Views/Body.Editor.cshtml
+++ b/src/Orchard.Web/Core/Common/Views/Body.Editor.cshtml
@@ -3,10 +3,16 @@
    var propertyName = Model.PropertyName != null ? (string)Model.PropertyName : "Text";

    string editorFlavor = Model.EditorFlavor;
+    var htmlAttributes = (Dictionary<string, object>)Model.HtmlAttributes;

-    var htmlAttributes = new Dictionary<string, object> {
-        {"class", editorFlavor.HtmlClassify()}
-    };
+    if (htmlAttributes == null) {
+        htmlAttributes = new Dictionary<string, object> {
+        {"class", editorFlavor.HtmlClassify()}};
+
+    }
+    else {
+        htmlAttributes["class"] = editorFlavor.HtmlClassify();
+    }

    if (Model.Required == true) {
        htmlAttributes["required"] = "required";
--- a/src/Orchard.Web/Core/Common/Views/DefinitionTemplates/TextFieldSettingsEventsViewModel.cshtml
+++ b/src/Orchard.Web/Core/Common/Views/DefinitionTemplates/TextFieldSettingsEventsViewModel.cshtml
@@ -7,6 +7,12 @@
        @Html.ValidationMessageFor(m => m.Settings.Flavor)
    </div>
 </fieldset>
+<fieldset>
+    <label for="@Html.FieldIdFor(m => m.Settings.MaxLength)">@T("Maximum length")</label>
+    @Html.EditorFor(m => m.Settings.MaxLength, new { htmlAttributes = new { min = 0 } })
+    <span class="hint">@T("Maximum length allowed for this field. Setting the value to 0 means unlimited length.")</span>
+    @Html.ValidationMessageFor(m => m.Settings.MaxLength)
+</fieldset>
 <fieldset>
    <div>
        @Html.CheckBoxFor(m => m.Settings.Required) <label for="@Html.FieldIdFor(m => m.Settings.Required)" class="forcheckbox">@T("Required")</label>
@@ -29,4 +35,4 @@
 </fieldset>
 <fieldset>
    @Display.DefinitionTemplate(TemplateName: "TextFieldDefaultValueEditor", Model: Model)
-</fieldset>
+</fieldset>
--- a/src/Orchard.Web/Core/Common/Views/EditorTemplates/Fields.Common.Text.Edit.cshtml
+++ b/src/Orchard.Web/Core/Common/Views/EditorTemplates/Fields.Common.Text.Edit.cshtml
@@ -1,17 +1,25 @@
@model Orchard.Core.Common.ViewModels.TextFieldDriverViewModel
+@{
+    var maxLength = Model.Settings.MaxLength > 0 ? Model.Settings.MaxLength.ToString() : "";
+}

 <fieldset>
-    <label for="@Html.FieldIdFor(m => m.Text)" @if(Model.Settings.Required) { <text>class="required"</text> }>@Model.Field.DisplayName</label>
+    <label for="@Html.FieldIdFor(m => m.Text)" @if (Model.Settings.Required) { <text> class="required" </text> }>@Model.Field.DisplayName</label>
    @if (String.IsNullOrWhiteSpace(Model.Settings.Flavor)) {
        @(Model.Settings.Required
-            ? Html.TextBoxFor(m => m.Text, new { @class = "text", required = "required", placeholder = Model.Settings.Placeholder })
-            : Html.TextBoxFor(m => m.Text, new { @class = "text", placeholder = Model.Settings.Placeholder }))
+            ? Html.TextBoxFor(m => m.Text, new { @class = "text", maxlength = maxLength, placeholder = Model.Settings.Placeholder, required = "required" })
+            : Html.TextBoxFor(m => m.Text, new { @class = "text", maxlength = maxLength, placeholder = Model.Settings.Placeholder }))
        @Html.ValidationMessageFor(m => m.Text)
    }
    else {
-       @Display.Body_Editor(Text: Model.Text, EditorFlavor: Model.Settings.Flavor, Required: Model.Settings.Required, ContentItem: Model.ContentItem, Placeholder: Model.Settings.Placeholder, Field: Model.Field)
+        var htmlAttributes = new Dictionary<string, object> {
+            {"maxlength", maxLength}
+        };
+
+        @Display.Body_Editor(Text: Model.Text, EditorFlavor: Model.Settings.Flavor, Required: Model.Settings.Required,
+            ContentItem: Model.ContentItem, Placeholder: Model.Settings.Placeholder, Field: Model.Field, HtmlAttributes: htmlAttributes)
    }
    @if (HasText(Model.Settings.Hint)) {
-    <span class="hint">@Model.Settings.Hint</span>
+        <span class="hint">@Model.Settings.Hint</span>
    }
 </fieldset>
--- a/src/Orchard.Web/Core/Navigation/Controllers/AdminController.cs
+++ b/src/Orchard.Web/Core/Navigation/Controllers/AdminController.cs
@@ -1,26 +1,26 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Linq;
 using System.Web.Mvc;
+using System.Web.Routing;
 using Orchard.ContentManagement;
+using Orchard.ContentManagement.Aspects;
+using Orchard.ContentManagement.Handlers;
+using Orchard.Core.Contents.Settings;
 using Orchard.Core.Navigation.Models;
 using Orchard.Core.Navigation.Services;
 using Orchard.Core.Navigation.ViewModels;
-using Orchard.Localization;
-using Orchard.Mvc.Extensions;
-using Orchard.UI;
-using Orchard.UI.Notify;
-using Orchard.UI.Navigation;
-using Orchard.Utility;
-using System;
-using Orchard.ContentManagement.Handlers;
-using Orchard.Logging;
-using Orchard.Exceptions;
-using Orchard.ContentManagement.Aspects;
-using Orchard.Utility.Extensions;
-using Orchard.Mvc.Html;
-using Orchard.Core.Contents.Settings;
 using Orchard.Data;
-using System.Web.Routing;
+using Orchard.Exceptions;
+using Orchard.Localization;
+using Orchard.Logging;
+using Orchard.Mvc.Extensions;
+using Orchard.Mvc.Html;
+using Orchard.UI;
+using Orchard.UI.Navigation;
+using Orchard.UI.Notify;
+using Orchard.Utility;
+using Orchard.Utility.Extensions;

 namespace Orchard.Core.Navigation.Controllers {
    [ValidateInput(false)]
@@ -249,13 +249,14 @@ namespace Orchard.Core.Navigation.Controllers {
        }

        [HttpPost, ActionName("Edit")]
-        [Mvc.FormValueRequired("submit.Save")]
+        [Mvc.FormValueRequired("submit.Publish")]
        public ActionResult EditPOST(int id, string returnUrl) {
            return EditPOST(id, returnUrl, contentItem => {
                if (!contentItem.Has<IPublishingControlAspect>() && !contentItem.TypeDefinition.Settings.GetModel<ContentTypeSettings>().Draftable)
                    _contentManager.Publish(contentItem);
            });
        }
+
        private ActionResult EditPOST(int id, string returnUrl, Action<ContentItem> conditionallyPublish) {
            var contentItem = _contentManager.Get(id, VersionOptions.DraftRequired);

--- a/src/Orchard.Web/Core/Navigation/ViewModels/MenuPartViewModel.cs
+++ b/src/Orchard.Web/Core/Navigation/ViewModels/MenuPartViewModel.cs
@@ -1,5 +1,7 @@
 using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
 using Orchard.ContentManagement;
+using Orchard.Core.Navigation.Models;

 namespace Orchard.Core.Navigation.ViewModels {
    public class MenuPartViewModel {
@@ -7,7 +9,8 @@ namespace Orchard.Core.Navigation.ViewModels {
        public int CurrentMenuId { get; set; }
        public bool OnMenu { get; set; }

-        public ContentItem ContentItem { get; set; } 
+        public ContentItem ContentItem { get; set; }
+        [StringLength(MenuPartRecord.DefaultMenuTextLength)]
        public string MenuText { get; set; }
    }
 }
--- a/src/Orchard.Web/Core/Orchard.Core.csproj
+++ b/src/Orchard.Web/Core/Orchard.Core.csproj
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props" Condition="Exists('..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props')" />
  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
  <PropertyGroup>
    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -14,7 +13,7 @@
    <RootNamespace>Orchard.Core</RootNamespace>
    <AssemblyName>Orchard.Core</AssemblyName>
    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
-    <MvcBuildViews>false</MvcBuildViews>
+    <LangVersion>7.3</LangVersion>
    <FileUpgradeFlags>
    </FileUpgradeFlags>
    <OldToolsVersion>4.0</OldToolsVersion>
@@ -39,7 +38,6 @@
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>..\..\OrchardBasicCorrectness.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
    <UseVSHostingProcess>false</UseVSHostingProcess>
@@ -51,13 +49,12 @@
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
  <ItemGroup>
-    <Reference Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
-      <HintPath>..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\lib\net45\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.dll</HintPath>
+    <Reference Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.4.1.0\lib\net472\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.dll</HintPath>
    </Reference>
    <Reference Include="Microsoft.CSharp" />
    <Reference Include="Microsoft.Web.Infrastructure, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
@@ -297,6 +294,8 @@
    <Compile Include="Title\Migrations.cs" />
    <Compile Include="Title\Models\TitlePart.cs" />
    <Compile Include="Title\Models\TitlePartRecord.cs" />
+    <Compile Include="Title\Settings\TitlePartSettings.cs" />
+    <Compile Include="Title\Settings\TitlePartSettingsEvents.cs" />
    <Compile Include="XmlRpc\Controllers\HomeController.cs" />
    <Compile Include="XmlRpc\Controllers\LiveWriterController.cs" />
    <Compile Include="XmlRpc\IXmlRpcDriver.cs" />
@@ -614,6 +613,7 @@
  </ItemGroup>
  <ItemGroup>
    <None Include="packages.config" />
+    <Content Include="Title\Views\DefinitionTemplates\TitlePartSettings.cshtml" />
  </ItemGroup>
  <PropertyGroup>
    <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">10.0</VisualStudioVersion>
@@ -659,10 +659,4 @@
      </FlavorProperties>
    </VisualStudio>
  </ProjectExtensions>
-  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
-    <PropertyGroup>
-      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
-    </PropertyGroup>
-    <Error Condition="!Exists('..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props'))" />
-  </Target>
 </Project>
--- a/src/Orchard.Web/Core/Title/Drivers/TitlePartDriver.cs
+++ b/src/Orchard.Web/Core/Title/Drivers/TitlePartDriver.cs
@@ -1,7 +1,9 @@
 using Orchard.ContentManagement;
 using Orchard.ContentManagement.Drivers;
 using Orchard.ContentManagement.Handlers;
+using Orchard.Core.Common.Settings;
 using Orchard.Core.Title.Models;
+using Orchard.Core.Title.Settings;
 using Orchard.Localization;

 namespace Orchard.Core.Title.Drivers {
@@ -33,7 +35,14 @@ namespace Orchard.Core.Title.Drivers {
        }

        protected override DriverResult Editor(TitlePart part, IUpdateModel updater, dynamic shapeHelper) {
-            updater.TryUpdateModel(part, Prefix, null, null);
+            if (updater.TryUpdateModel(part, Prefix, null, null)){
+
+                var settings = part.Settings.GetModel<TitlePartSettings>();
+
+                if (settings.MaxLength > 0 && part.Title.Length > settings.MaxLength) {
+                    updater.AddModelError("Title", T("The maximum allowed length for the title is {0}", settings.MaxLength));
+                }
+            }

            return Editor(part, shapeHelper);
        }
--- a/src/Orchard.Web/Core/Title/Migrations.cs
+++ b/src/Orchard.Web/Core/Title/Migrations.cs
@@ -1,6 +1,7 @@
 using Orchard.ContentManagement.MetaData;
 using Orchard.Core.Contents.Extensions;
 using Orchard.Data.Migration;
+using Orchard.Core.Title.Settings;

 namespace Orchard.Core.Title {
    public class Migrations : DataMigrationImpl {
@@ -9,7 +10,7 @@ namespace Orchard.Core.Title {
            SchemaBuilder.CreateTable("TitlePartRecord", 
                table => table
                    .ContentPartVersionRecord()
-                    .Column<string>("Title", column => column.WithLength(1024))
+                    .Column<string>("Title", column => column.WithLength(TitlePartSettings.MaxTitleLength))
                );

            ContentDefinitionManager.AlterPartDefinition("TitlePart", builder => builder
--- a/src/Orchard.Web/Core/Title/Settings/TitlePartSettings.cs
+++ b/src/Orchard.Web/Core/Title/Settings/TitlePartSettings.cs
@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel;
+using System.Linq;
+using System.Web;
+
+namespace Orchard.Core.Title.Settings {
+
+    
+    public class TitlePartSettings {
+        // Whenever this constant is changed a new migration step must be created to update the length of the field on the DB
+        public const int MaxTitleLength = 1024;
+        [Range(0, MaxTitleLength)]
+        [DisplayName("Maximum Length")]
+        public int MaxLength {get; set;}
+
+    }
+}
--- a/src/Orchard.Web/Core/Title/Settings/TitlePartSettingsEvents.cs
+++ b/src/Orchard.Web/Core/Title/Settings/TitlePartSettingsEvents.cs
@@ -0,0 +1,42 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Web;
+using Orchard.ContentManagement;
+using Orchard.ContentManagement.MetaData;
+using Orchard.ContentManagement.MetaData.Builders;
+using Orchard.ContentManagement.MetaData.Models;
+using Orchard.ContentManagement.ViewModels;
+
+namespace Orchard.Core.Title.Settings {
+    public class TitlePartSettingsEvents : ContentDefinitionEditorEventsBase {
+
+        public override IEnumerable<TemplateViewModel> TypePartEditor(ContentTypePartDefinition definition) {
+            if (definition.PartDefinition.Name != "TitlePart") {
+                yield break;
+            }
+
+            var settings = definition
+                .Settings
+                .GetModel<TitlePartSettings>()
+                ?? new TitlePartSettings();
+
+            yield return DefinitionTemplate(settings);
+        }
+
+        public override IEnumerable<TemplateViewModel> TypePartEditorUpdate(ContentTypePartDefinitionBuilder builder, IUpdateModel updateModel) {
+
+            if (builder.Name != "TitlePart") {
+                yield break;
+            }
+
+            var model = new TitlePartSettings();
+
+            if (updateModel.TryUpdateModel(model, "TitlePartSettings", null, null)) {
+                builder.WithSetting("TitlePartSettings.MaxLength", model.MaxLength.ToString());
+
+            }
+            yield return DefinitionTemplate(model);
+        }
+    }
+}
--- a/src/Orchard.Web/Core/Title/Views/DefinitionTemplates/TitlePartSettings.cshtml
+++ b/src/Orchard.Web/Core/Title/Views/DefinitionTemplates/TitlePartSettings.cshtml
@@ -0,0 +1,12 @@
+@using Orchard.Core.Title.Settings;
+@model TitlePartSettings
+@{
+    var maxLength = TitlePartSettings.MaxTitleLength;
+}
+
+<fieldset>
+    <label for="@Html.FieldIdFor(m => m.MaxLength)">@T("Maximum length")</label>
+    @Html.EditorFor(m => m.MaxLength, new { htmlAttributes = new { min = 0, max = maxLength } })
+    <span class="hint">@T("Maximum length allowed for the title. Setting the value to 0 means the maximum allowed length is {0} characters.", maxLength)</span>
+    @Html.ValidationMessageFor(m => m.MaxLength)
+</fieldset>
--- a/src/Orchard.Web/Core/Title/Views/EditorTemplates/Parts.Title.TitlePart.cshtml
+++ b/src/Orchard.Web/Core/Title/Views/EditorTemplates/Parts.Title.TitlePart.cshtml
@@ -1,7 +1,11 @@
-@model Orchard.Core.Title.Models.TitlePart
+@using Orchard.Core.Title.Settings
+@model Orchard.Core.Title.Models.TitlePart
+@{
+    var maxLength = Model.Settings.GetModel<TitlePartSettings>().MaxLength > 0 ? Model.Settings.GetModel<TitlePartSettings>().MaxLength.ToString() : "";
+}

 <fieldset>
-    <label for="@Html.FieldIdFor(m => m.Title)" class="required">@T("Title")</label>    
-    @Html.TextBoxFor(m => m.Title, new { @class = "text large", autofocus = "autofocus" })
+    <label for="@Html.FieldIdFor(m => m.Title)" class="required">@T("Title")</label>
+    @Html.TextBoxFor(m => m.Title, new { @class = "text large", autofocus = "autofocus", maxlength = maxLength })
    <span class="hint">@T("You must provide a title for this content item")</span>
 </fieldset>
--- a/src/Orchard.Web/Core/Web.config
+++ b/src/Orchard.Web/Core/Web.config
@@ -21,7 +21,6 @@
            </namespaces>
        </pages>
    </system.web.webPages.razor>
-    <!-- Registering Roslyn as a compiler for Razor IntelliSense. -->
    <appSettings>
        <add key="aspnet:RoslynCompilerLocation" value="..\bin\roslyn" />
    </appSettings>
@@ -73,8 +72,7 @@
  </runtime>
  <system.codedom>
    <compilers>
-      <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:1659;1699;1701" />
-      <compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:41008 /define:_MYTYPE=\&quot;Web\&quot; /optionInfer+" />
+      <compiler language="c#;cs;csharp" extension=".cs" warningLevel="4" compilerOptions="/langversion:7.3 /nowarn:1659;1699;1701;612;618" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
    </compilers>
  </system.codedom>
 </configuration>
--- a/src/Orchard.Web/Core/packages.config
+++ b/src/Orchard.Web/Core/packages.config
@@ -3,7 +3,7 @@
  <package id="Microsoft.AspNet.Mvc" version="5.2.7" targetFramework="net48" />
  <package id="Microsoft.AspNet.Razor" version="3.2.7" targetFramework="net48" />
  <package id="Microsoft.AspNet.WebPages" version="3.2.7" targetFramework="net48" />
-  <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="2.0.1" targetFramework="net48" />
+  <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="4.1.0" targetFramework="net48" />
  <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net48" />
  <package id="NHibernate" version="5.3.10" targetFramework="net48" />
 </packages>
--- a/src/Orchard.Web/Modules/Lucene/Lucene.csproj
+++ b/src/Orchard.Web/Modules/Lucene/Lucene.csproj
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props" Condition="Exists('..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props')" />
  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
  <PropertyGroup>
    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -15,7 +14,7 @@
    <RootNamespace>Lucene</RootNamespace>
    <AssemblyName>Lucene</AssemblyName>
    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
-    <MvcBuildViews>false</MvcBuildViews>
+    <LangVersion>7.3</LangVersion>
    <UseIISExpress>false</UseIISExpress>
    <FileUpgradeFlags>
    </FileUpgradeFlags>
@@ -40,7 +39,6 @@
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>..\..\..\OrchardBasicCorrectness.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
@@ -51,18 +49,14 @@
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
  <ItemGroup>
-    <Reference Include="ICSharpCode.SharpZipLib, Version=1.3.3.11, Culture=neutral, PublicKeyToken=1b03e6acf1164f73, processorArchitecture=MSIL">
-      <HintPath>..\..\..\packages\SharpZipLib.1.3.3\lib\net45\ICSharpCode.SharpZipLib.dll</HintPath>
-    </Reference>
    <Reference Include="Lucene.Net, Version=3.0.3.0, Culture=neutral, PublicKeyToken=85089178b9ac3181, processorArchitecture=MSIL">
      <HintPath>..\..\..\packages\Lucene.Net.3.0.3\lib\NET40\Lucene.Net.dll</HintPath>
    </Reference>
-    <Reference Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
-      <HintPath>..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\lib\net45\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.dll</HintPath>
+    <Reference Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.4.1.0\lib\net472\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.dll</HintPath>
    </Reference>
    <Reference Include="Microsoft.CSharp" />
    <Reference Include="Microsoft.Web.Infrastructure, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
@@ -170,10 +164,4 @@
      </FlavorProperties>
    </VisualStudio>
  </ProjectExtensions>
-  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
-    <PropertyGroup>
-      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
-    </PropertyGroup>
-    <Error Condition="!Exists('..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props'))" />
-  </Target>
 </Project>
--- a/src/Orchard.Web/Modules/Lucene/Web.config
+++ b/src/Orchard.Web/Modules/Lucene/Web.config
@@ -21,7 +21,6 @@
            </namespaces>
        </pages>
    </system.web.webPages.razor>
-    <!-- Registering Roslyn as a compiler for Razor IntelliSense. -->
    <appSettings>
        <add key="aspnet:RoslynCompilerLocation" value="..\..\bin\roslyn" />
    </appSettings>
@@ -72,8 +71,7 @@
  </runtime>
  <system.codedom>
    <compilers>
-      <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:1659;1699;1701" />
-      <compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:41008 /define:_MYTYPE=\&quot;Web\&quot; /optionInfer+" />
+      <compiler language="c#;cs;csharp" extension=".cs" warningLevel="4" compilerOptions="/langversion:7.3 /nowarn:1659;1699;1701;612;618" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
    </compilers>
  </system.codedom>
 </configuration>
--- a/src/Orchard.Web/Modules/Lucene/packages.config
+++ b/src/Orchard.Web/Modules/Lucene/packages.config
@@ -4,7 +4,6 @@
  <package id="Microsoft.AspNet.Mvc" version="5.2.7" targetFramework="net48" />
  <package id="Microsoft.AspNet.Razor" version="3.2.7" targetFramework="net48" />
  <package id="Microsoft.AspNet.WebPages" version="3.2.7" targetFramework="net48" />
-  <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="2.0.1" targetFramework="net48" />
+  <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="4.1.0" targetFramework="net48" />
  <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net48" />
-  <package id="SharpZipLib" version="1.3.3" targetFramework="net48" />
 </packages>
--- a/src/Orchard.Web/Modules/Markdown/Markdown.csproj
+++ b/src/Orchard.Web/Modules/Markdown/Markdown.csproj
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props" Condition="Exists('..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props')" />
  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
  <PropertyGroup>
    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -14,7 +13,7 @@
    <RootNamespace>Markdown</RootNamespace>
    <AssemblyName>Markdown</AssemblyName>
    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
-    <MvcBuildViews>false</MvcBuildViews>
+    <LangVersion>7.3</LangVersion>
    <FileUpgradeFlags>
    </FileUpgradeFlags>
    <OldToolsVersion>4.0</OldToolsVersion>
@@ -39,7 +38,6 @@
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>..\..\..\OrchardBasicCorrectness.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
@@ -50,7 +48,6 @@
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
@@ -58,8 +55,8 @@
    <Reference Include="Markdig.Signed, Version=0.22.1.0, Culture=neutral, PublicKeyToken=870da25a133885f8, processorArchitecture=MSIL">
      <HintPath>..\..\..\packages\Markdig.Signed.0.22.1\lib\net452\Markdig.Signed.dll</HintPath>
    </Reference>
-    <Reference Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
-      <HintPath>..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\lib\net45\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.dll</HintPath>
+    <Reference Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.4.1.0\lib\net472\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.dll</HintPath>
    </Reference>
    <Reference Include="Microsoft.Web.Infrastructure, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
      <HintPath>..\..\..\packages\Microsoft.Web.Infrastructure.1.0.0.0\lib\net40\Microsoft.Web.Infrastructure.dll</HintPath>
@@ -234,10 +231,4 @@
      </FlavorProperties>
    </VisualStudio>
  </ProjectExtensions>
-  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
-    <PropertyGroup>
-      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
-    </PropertyGroup>
-    <Error Condition="!Exists('..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props'))" />
-  </Target>
 </Project>
--- a/src/Orchard.Web/Modules/Markdown/Web.config
+++ b/src/Orchard.Web/Modules/Markdown/Web.config
@@ -21,7 +21,6 @@
            </namespaces>
        </pages>
    </system.web.webPages.razor>
-    <!-- Registering Roslyn as a compiler for Razor IntelliSense. -->
    <appSettings>
        <add key="aspnet:RoslynCompilerLocation" value="..\..\bin\roslyn" />
    </appSettings>
@@ -73,8 +72,7 @@
  </runtime>
  <system.codedom>
    <compilers>
-      <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:1659;1699;1701" />
-      <compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:41008 /define:_MYTYPE=\&quot;Web\&quot; /optionInfer+" />
+      <compiler language="c#;cs;csharp" extension=".cs" warningLevel="4" compilerOptions="/langversion:7.3 /nowarn:1659;1699;1701;612;618" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
    </compilers>
  </system.codedom>
 </configuration>
--- a/src/Orchard.Web/Modules/Markdown/packages.config
+++ b/src/Orchard.Web/Modules/Markdown/packages.config
@@ -4,7 +4,7 @@
  <package id="Microsoft.AspNet.Mvc" version="5.2.7" targetFramework="net48" />
  <package id="Microsoft.AspNet.Razor" version="3.2.7" targetFramework="net48" />
  <package id="Microsoft.AspNet.WebPages" version="3.2.7" targetFramework="net48" />
-  <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="2.0.1" targetFramework="net48" />
+  <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="4.1.0" targetFramework="net48" />
  <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net48" />
  <package id="System.Buffers" version="4.5.1" targetFramework="net48" />
  <package id="System.Memory" version="4.5.4" targetFramework="net48" />
--- a/src/Orchard.Web/Modules/Orchard.Alias/Orchard.Alias.csproj
+++ b/src/Orchard.Web/Modules/Orchard.Alias/Orchard.Alias.csproj
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props" Condition="Exists('..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props')" />
  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
  <PropertyGroup>
    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -14,7 +13,7 @@
    <RootNamespace>Orchard.Alias</RootNamespace>
    <AssemblyName>Orchard.Alias</AssemblyName>
    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
-    <MvcBuildViews>false</MvcBuildViews>
+    <LangVersion>7.3</LangVersion>
    <FileUpgradeFlags>
    </FileUpgradeFlags>
    <OldToolsVersion>4.0</OldToolsVersion>
@@ -39,7 +38,6 @@
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>..\..\..\OrchardBasicCorrectness.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
@@ -50,13 +48,12 @@
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
  <ItemGroup>
-    <Reference Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
-      <HintPath>..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\lib\net45\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.dll</HintPath>
+    <Reference Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.4.1.0\lib\net472\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.dll</HintPath>
    </Reference>
    <Reference Include="Microsoft.CSharp" />
    <Reference Include="Microsoft.Web.Infrastructure, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
@@ -196,10 +193,4 @@
      </FlavorProperties>
    </VisualStudio>
  </ProjectExtensions>
-  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
-    <PropertyGroup>
-      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
-    </PropertyGroup>
-    <Error Condition="!Exists('..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props'))" />
-  </Target>
 </Project>
--- a/src/Orchard.Web/Modules/Orchard.Alias/Views/Admin/IndexManaged.cshtml
+++ b/src/Orchard.Web/Modules/Orchard.Alias/Views/Admin/IndexManaged.cshtml
@@ -6,8 +6,6 @@
@using Orchard.Utility.Extensions

@{
-    var urlPrefix = WorkContext.Resolve<ShellSettings>().RequestUrlPrefix;
-
    Layout.Title = T("Manage Aliases").Text;
    var aliasService = WorkContext.Resolve<IAliasService>();
    AdminIndexOptions options = Model.Options;
@@ -59,10 +57,10 @@
                <tr>
                    <td>
                        <input type="hidden" value="@alias.Path" name="@Html.FieldNameFor(m => Model.AliasEntries[index].Alias.Path)" />
-                        @Html.Link(alias.Path == String.Empty ? "/" : alias.Path, Href("~/" + urlPrefix + alias.Path))
+                        @Html.Link(alias.Path == String.Empty ? "/" : alias.Path, Href("~/" + alias.Path))
                    </td>
                    <td>
-                        @Html.Link(url, Href("~/" + urlPrefix + "/" + url))
+                        @Html.Link(url, Href("~/" + url))
                    </td>                   
                </tr>
            }
--- a/src/Orchard.Web/Modules/Orchard.Alias/Views/Admin/IndexUnmanaged.cshtml
+++ b/src/Orchard.Web/Modules/Orchard.Alias/Views/Admin/IndexUnmanaged.cshtml
@@ -6,8 +6,6 @@
@using Orchard.Utility.Extensions

@{
-    var urlPrefix = WorkContext.Resolve<ShellSettings>().RequestUrlPrefix;
-
    Layout.Title = T("Manage Aliases").Text;
    var aliasService = WorkContext.Resolve<IAliasService>();
    AdminIndexOptions options = Model.Options;
@@ -73,10 +71,10 @@
                        <input type="checkbox" value="true" name="@Html.FieldNameFor(m => Model.AliasEntries[index].IsChecked)" />
                    </td>
                    <td>
-                        @Html.Link(alias.Path == String.Empty ? "/" : alias.Path, Href("~/" + urlPrefix + alias.Path))
+                        @Html.Link(alias.Path == String.Empty ? "/" : alias.Path, Href("~/" + alias.Path))
                    </td>
                    <td>
-                        @Html.Link(url, Href("~/" + urlPrefix + "/" + url))
+                        @Html.Link(url, Href("~/" + url))
                    </td>
                    <td>
                        <ul class="action-links">
--- a/src/Orchard.Web/Modules/Orchard.Alias/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Alias/Web.config
@@ -21,7 +21,6 @@
            </namespaces>
        </pages>
    </system.web.webPages.razor>
-    <!-- Registering Roslyn as a compiler for Razor IntelliSense. -->
    <appSettings>
        <add key="aspnet:RoslynCompilerLocation" value="..\..\bin\roslyn" />
    </appSettings>
@@ -73,8 +72,7 @@
  </runtime>
  <system.codedom>
    <compilers>
-      <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:1659;1699;1701" />
-      <compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:41008 /define:_MYTYPE=\&quot;Web\&quot; /optionInfer+" />
+      <compiler language="c#;cs;csharp" extension=".cs" warningLevel="4" compilerOptions="/langversion:7.3 /nowarn:1659;1699;1701;612;618" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
    </compilers>
  </system.codedom>
 </configuration>
--- a/src/Orchard.Web/Modules/Orchard.Alias/packages.config
+++ b/src/Orchard.Web/Modules/Orchard.Alias/packages.config
@@ -3,6 +3,6 @@
  <package id="Microsoft.AspNet.Mvc" version="5.2.7" targetFramework="net48" />
  <package id="Microsoft.AspNet.Razor" version="3.2.7" targetFramework="net48" />
  <package id="Microsoft.AspNet.WebPages" version="3.2.7" targetFramework="net48" />
-  <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="2.0.1" targetFramework="net48" />
+  <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="4.1.0" targetFramework="net48" />
  <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net48" />
 </packages>
--- a/src/Orchard.Web/Modules/Orchard.AntiSpam/Orchard.AntiSpam.csproj
+++ b/src/Orchard.Web/Modules/Orchard.AntiSpam/Orchard.AntiSpam.csproj
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props" Condition="Exists('..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props')" />
  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
  <PropertyGroup>
    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -14,7 +13,7 @@
    <RootNamespace>Orchard.AntiSpam</RootNamespace>
    <AssemblyName>Orchard.AntiSpam</AssemblyName>
    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
-    <MvcBuildViews>false</MvcBuildViews>
+    <LangVersion>7.3</LangVersion>
    <FileUpgradeFlags>
    </FileUpgradeFlags>
    <OldToolsVersion>4.0</OldToolsVersion>
@@ -39,7 +38,6 @@
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>..\..\..\OrchardBasicCorrectness.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
@@ -50,13 +48,12 @@
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
  <ItemGroup>
-    <Reference Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
-      <HintPath>..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\lib\net45\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.dll</HintPath>
+    <Reference Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.4.1.0\lib\net472\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.dll</HintPath>
    </Reference>
    <Reference Include="Microsoft.CSharp" />
    <Reference Include="Microsoft.Web.Infrastructure, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
@@ -253,10 +250,4 @@
      </FlavorProperties>
    </VisualStudio>
  </ProjectExtensions>
-  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
-    <PropertyGroup>
-      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
-    </PropertyGroup>
-    <Error Condition="!Exists('..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props'))" />
-  </Target>
 </Project>
--- a/src/Orchard.Web/Modules/Orchard.AntiSpam/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.AntiSpam/Web.config
@@ -21,7 +21,6 @@
            </namespaces>
        </pages>
    </system.web.webPages.razor>
-    <!-- Registering Roslyn as a compiler for Razor IntelliSense. -->
    <appSettings>
        <add key="aspnet:RoslynCompilerLocation" value="..\..\bin\roslyn" />
    </appSettings>
@@ -73,8 +72,7 @@
  </runtime>
  <system.codedom>
    <compilers>
-      <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:1659;1699;1701" />
-      <compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:41008 /define:_MYTYPE=\&quot;Web\&quot; /optionInfer+" />
+      <compiler language="c#;cs;csharp" extension=".cs" warningLevel="4" compilerOptions="/langversion:7.3 /nowarn:1659;1699;1701;612;618" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
    </compilers>
  </system.codedom>
 </configuration>
--- a/src/Orchard.Web/Modules/Orchard.AntiSpam/packages.config
+++ b/src/Orchard.Web/Modules/Orchard.AntiSpam/packages.config
@@ -3,7 +3,7 @@
  <package id="Microsoft.AspNet.Mvc" version="5.2.7" targetFramework="net48" />
  <package id="Microsoft.AspNet.Razor" version="3.2.7" targetFramework="net48" />
  <package id="Microsoft.AspNet.WebPages" version="3.2.7" targetFramework="net48" />
-  <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="2.0.1" targetFramework="net48" />
+  <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="4.1.0" targetFramework="net48" />
  <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net48" />
  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net48" />
 </packages>
--- a/src/Orchard.Web/Modules/Orchard.ArchiveLater/Orchard.ArchiveLater.csproj
+++ b/src/Orchard.Web/Modules/Orchard.ArchiveLater/Orchard.ArchiveLater.csproj
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props" Condition="Exists('..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props')" />
  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
  <PropertyGroup>
    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -15,7 +14,7 @@
    <RootNamespace>Orchard.ArchiveLater</RootNamespace>
    <AssemblyName>Orchard.ArchiveLater</AssemblyName>
    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
-    <MvcBuildViews>false</MvcBuildViews>
+    <LangVersion>7.3</LangVersion>
    <FileUpgradeFlags>
    </FileUpgradeFlags>
    <UpgradeBackupLocation>
@@ -40,7 +39,6 @@
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>..\..\..\OrchardBasicCorrectness.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
@@ -51,12 +49,11 @@
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
  <ItemGroup>
-    <Reference Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
-      <HintPath>..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\lib\net45\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.dll</HintPath>
+    <Reference Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.4.1.0\lib\net472\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.dll</HintPath>
    </Reference>
    <Reference Include="Microsoft.CSharp" />
    <Reference Include="Microsoft.Web.Infrastructure, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
@@ -169,10 +166,4 @@
      </FlavorProperties>
    </VisualStudio>
  </ProjectExtensions>
-  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
-    <PropertyGroup>
-      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
-    </PropertyGroup>
-    <Error Condition="!Exists('..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props'))" />
-  </Target>
 </Project>
--- a/src/Orchard.Web/Modules/Orchard.ArchiveLater/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.ArchiveLater/Web.config
@@ -21,7 +21,6 @@
            </namespaces>
        </pages>
    </system.web.webPages.razor>
-    <!-- Registering Roslyn as a compiler for Razor IntelliSense. -->
    <appSettings>
        <add key="aspnet:RoslynCompilerLocation" value="..\..\bin\roslyn" />
    </appSettings>
@@ -73,8 +72,7 @@
  </runtime>
  <system.codedom>
    <compilers>
-      <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:1659;1699;1701" />
-      <compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:41008 /define:_MYTYPE=\&quot;Web\&quot; /optionInfer+" />
+      <compiler language="c#;cs;csharp" extension=".cs" warningLevel="4" compilerOptions="/langversion:7.3 /nowarn:1659;1699;1701;612;618" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
    </compilers>
  </system.codedom>
 </configuration>
--- a/src/Orchard.Web/Modules/Orchard.ArchiveLater/packages.config
+++ b/src/Orchard.Web/Modules/Orchard.ArchiveLater/packages.config
@@ -3,6 +3,6 @@
  <package id="Microsoft.AspNet.Mvc" version="5.2.7" targetFramework="net48" />
  <package id="Microsoft.AspNet.Razor" version="3.2.7" targetFramework="net48" />
  <package id="Microsoft.AspNet.WebPages" version="3.2.7" targetFramework="net48" />
-  <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="2.0.1" targetFramework="net48" />
+  <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="4.1.0" targetFramework="net48" />
  <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net48" />
 </packages>
--- a/src/Orchard.Web/Modules/Orchard.AuditTrail/Orchard.AuditTrail.csproj
+++ b/src/Orchard.Web/Modules/Orchard.AuditTrail/Orchard.AuditTrail.csproj
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props" Condition="Exists('..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props')" />
  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
  <PropertyGroup>
    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -14,7 +13,7 @@
    <RootNamespace>Orchard.AuditTrail</RootNamespace>
    <AssemblyName>Orchard.AuditTrail</AssemblyName>
    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
-    <MvcBuildViews>false</MvcBuildViews>
+    <LangVersion>7.3</LangVersion>
    <FileUpgradeFlags>
    </FileUpgradeFlags>
    <OldToolsVersion>4.0</OldToolsVersion>
@@ -38,7 +37,6 @@
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>..\..\..\OrchardBasicCorrectness.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
@@ -49,7 +47,6 @@
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
@@ -60,8 +57,8 @@
    <Reference Include="Iesi.Collections, Version=4.0.0.4000, Culture=neutral, PublicKeyToken=aa95f207798dfdb4, processorArchitecture=MSIL">
      <HintPath>..\..\..\packages\Iesi.Collections.4.0.4\lib\net461\Iesi.Collections.dll</HintPath>
    </Reference>
-    <Reference Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
-      <HintPath>..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\lib\net45\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.dll</HintPath>
+    <Reference Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.4.1.0\lib\net472\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.dll</HintPath>
    </Reference>
    <Reference Include="Microsoft.CSharp" />
    <Reference Include="Microsoft.Web.Infrastructure, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
@@ -412,10 +409,4 @@
      </FlavorProperties>
    </VisualStudio>
  </ProjectExtensions>
-  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
-    <PropertyGroup>
-      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
-    </PropertyGroup>
-    <Error Condition="!Exists('..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props'))" />
-  </Target>
 </Project>
--- a/src/Orchard.Web/Modules/Orchard.AuditTrail/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.AuditTrail/Web.config
@@ -21,7 +21,6 @@
            </namespaces>
        </pages>
    </system.web.webPages.razor>
-    <!-- Registering Roslyn as a compiler for Razor IntelliSense. -->
    <appSettings>
        <add key="aspnet:RoslynCompilerLocation" value="..\..\bin\roslyn" />
    </appSettings>
@@ -75,8 +74,7 @@
  </runtime>
  <system.codedom>
    <compilers>
-      <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:1659;1699;1701" />
-      <compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:41008 /define:_MYTYPE=\&quot;Web\&quot; /optionInfer+" />
+      <compiler language="c#;cs;csharp" extension=".cs" warningLevel="4" compilerOptions="/langversion:7.3 /nowarn:1659;1699;1701;612;618" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
    </compilers>
  </system.codedom>
 </configuration>
--- a/src/Orchard.Web/Modules/Orchard.AuditTrail/packages.config
+++ b/src/Orchard.Web/Modules/Orchard.AuditTrail/packages.config
@@ -5,7 +5,7 @@
  <package id="Microsoft.AspNet.Mvc" version="5.2.7" targetFramework="net48" />
  <package id="Microsoft.AspNet.Razor" version="3.2.7" targetFramework="net48" />
  <package id="Microsoft.AspNet.WebPages" version="3.2.7" targetFramework="net48" />
-  <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="2.0.1" targetFramework="net48" />
+  <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="4.1.0" targetFramework="net48" />
  <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net48" />
  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net48" />
  <package id="NHibernate" version="5.3.10" targetFramework="net48" />
--- a/src/Orchard.Web/Modules/Orchard.Autoroute/Orchard.Autoroute.csproj
+++ b/src/Orchard.Web/Modules/Orchard.Autoroute/Orchard.Autoroute.csproj
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props" Condition="Exists('..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props')" />
  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
  <PropertyGroup>
    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -14,7 +13,7 @@
    <RootNamespace>Orchard.Autoroute</RootNamespace>
    <AssemblyName>Orchard.Autoroute</AssemblyName>
    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
-    <MvcBuildViews>false</MvcBuildViews>
+    <LangVersion>7.3</LangVersion>
    <FileUpgradeFlags>
    </FileUpgradeFlags>
    <OldToolsVersion>4.0</OldToolsVersion>
@@ -39,7 +38,6 @@
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>..\..\..\OrchardBasicCorrectness.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
@@ -50,13 +48,12 @@
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
  <ItemGroup>
-    <Reference Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
-      <HintPath>..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\lib\net45\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.dll</HintPath>
+    <Reference Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.4.1.0\lib\net472\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.dll</HintPath>
    </Reference>
    <Reference Include="Microsoft.CSharp" />
    <Reference Include="Microsoft.Web.Infrastructure, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
@@ -217,10 +214,4 @@
      </FlavorProperties>
    </VisualStudio>
  </ProjectExtensions>
-  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
-    <PropertyGroup>
-      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
-    </PropertyGroup>
-    <Error Condition="!Exists('..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props'))" />
-  </Target>
 </Project>
--- a/src/Orchard.Web/Modules/Orchard.Autoroute/Providers/SlugTokens.cs
+++ b/src/Orchard.Web/Modules/Orchard.Autoroute/Providers/SlugTokens.cs
@@ -41,6 +41,7 @@ namespace Orchard.Autoroute.Providers {
            context.For<IContent>("Content")
                // {Content.Slug}
                .Token("Slug", (content => content == null ? String.Empty : _slugService.Slugify(content)))
+                .Chain("Slug", "Text", (content => content == null ? String.Empty : _slugService.Slugify(content)))
                .Token("Path", (content => {
                    var autoroutePart = content.As<AutoroutePart>();
                    if (autoroutePart == null) {
--- a/src/Orchard.Web/Modules/Orchard.Autoroute/Services/AutorouteService.cs
+++ b/src/Orchard.Web/Modules/Orchard.Autoroute/Services/AutorouteService.cs
@@ -186,7 +186,7 @@ namespace Orchard.Autoroute.Services {
        }

        public string GenerateUniqueSlug(AutoroutePart part, IEnumerable<string> existingPaths) {
-            if (existingPaths == null || !existingPaths.Contains(part.Path))
+            if (existingPaths == null || !existingPaths.Contains(part.Path, StringComparer.OrdinalIgnoreCase))
                return part.Path;

            var version = existingPaths.Select(s => GetSlugVersion(part.Path, s)).OrderBy(i => i).LastOrDefault();
@@ -287,7 +287,8 @@ namespace Orchard.Autoroute.Services {

        private static int? GetSlugVersion(string path, string potentialConflictingPath) {
            int v;
-            var slugParts = potentialConflictingPath.Split(new[] { path }, StringSplitOptions.RemoveEmptyEntries);
+            // Matching needs to ignore case, so both paths are forced to lowercase.
+            var slugParts = potentialConflictingPath.ToLower().Split(new[] { path.ToLower() }, StringSplitOptions.RemoveEmptyEntries);

            if (slugParts.Length == 0)
                return 2;
--- a/src/Orchard.Web/Modules/Orchard.Autoroute/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Autoroute/Web.config
@@ -20,7 +20,6 @@
            </namespaces>
        </pages>
    </system.web.webPages.razor>
-    <!-- Registering Roslyn as a compiler for Razor IntelliSense. -->
    <appSettings>
        <add key="aspnet:RoslynCompilerLocation" value="..\..\bin\roslyn" />
    </appSettings>
@@ -72,8 +71,7 @@
  </runtime>
  <system.codedom>
    <compilers>
-      <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:1659;1699;1701" />
-      <compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:41008 /define:_MYTYPE=\&quot;Web\&quot; /optionInfer+" />
+      <compiler language="c#;cs;csharp" extension=".cs" warningLevel="4" compilerOptions="/langversion:7.3 /nowarn:1659;1699;1701;612;618" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
    </compilers>
  </system.codedom>
 </configuration>
--- a/src/Orchard.Web/Modules/Orchard.Autoroute/packages.config
+++ b/src/Orchard.Web/Modules/Orchard.Autoroute/packages.config
@@ -3,6 +3,6 @@
  <package id="Microsoft.AspNet.Mvc" version="5.2.7" targetFramework="net48" />
  <package id="Microsoft.AspNet.Razor" version="3.2.7" targetFramework="net48" />
  <package id="Microsoft.AspNet.WebPages" version="3.2.7" targetFramework="net48" />
-  <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="2.0.1" targetFramework="net48" />
+  <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="4.1.0" targetFramework="net48" />
  <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net48" />
 </packages>
--- a/src/Orchard.Web/Modules/Orchard.Azure.MediaServices/Orchard.Azure.MediaServices.csproj
+++ b/src/Orchard.Web/Modules/Orchard.Azure.MediaServices/Orchard.Azure.MediaServices.csproj
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props" Condition="Exists('..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props')" />
  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
  <PropertyGroup>
    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -14,7 +13,7 @@
    <RootNamespace>Orchard.Azure.MediaServices</RootNamespace>
    <AssemblyName>Orchard.Azure.MediaServices</AssemblyName>
    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
-    <MvcBuildViews>false</MvcBuildViews>
+    <LangVersion>7.3</LangVersion>
    <FileUpgradeFlags>
    </FileUpgradeFlags>
    <OldToolsVersion>4.0</OldToolsVersion>
@@ -38,7 +37,6 @@
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>..\..\..\OrchardBasicCorrectness.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
@@ -49,7 +47,6 @@
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
@@ -69,8 +66,8 @@
    <Reference Include="Microsoft.Azure.KeyVault.Core, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
      <HintPath>..\..\..\packages\Microsoft.Azure.KeyVault.Core.1.0.0\lib\net40\Microsoft.Azure.KeyVault.Core.dll</HintPath>
    </Reference>
-    <Reference Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
-      <HintPath>..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\lib\net45\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.dll</HintPath>
+    <Reference Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.4.1.0\lib\net472\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.dll</HintPath>
    </Reference>
    <Reference Include="Microsoft.CSharp" />
    <Reference Include="Microsoft.Data.Edm, Version=5.8.4.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
@@ -82,14 +79,14 @@
    <Reference Include="Microsoft.Data.Services.Client, Version=5.8.4.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
      <HintPath>..\..\..\packages\Microsoft.Data.Services.Client.5.8.4\lib\net40\Microsoft.Data.Services.Client.dll</HintPath>
    </Reference>
-    <Reference Include="Microsoft.IdentityModel.JsonWebTokens, Version=5.2.4.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
-      <HintPath>..\..\..\packages\Microsoft.IdentityModel.JsonWebTokens.5.2.4\lib\net451\Microsoft.IdentityModel.JsonWebTokens.dll</HintPath>
+    <Reference Include="Microsoft.IdentityModel.JsonWebTokens, Version=5.7.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\..\..\packages\Microsoft.IdentityModel.JsonWebTokens.5.7.0\lib\net461\Microsoft.IdentityModel.JsonWebTokens.dll</HintPath>
    </Reference>
-    <Reference Include="Microsoft.IdentityModel.Logging, Version=5.2.4.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
-      <HintPath>..\..\..\packages\Microsoft.IdentityModel.Logging.5.2.4\lib\net451\Microsoft.IdentityModel.Logging.dll</HintPath>
+    <Reference Include="Microsoft.IdentityModel.Logging, Version=5.7.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\..\..\packages\Microsoft.IdentityModel.Logging.5.7.0\lib\net461\Microsoft.IdentityModel.Logging.dll</HintPath>
    </Reference>
-    <Reference Include="Microsoft.IdentityModel.Tokens, Version=5.2.4.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
-      <HintPath>..\..\..\packages\Microsoft.IdentityModel.Tokens.5.2.4\lib\net451\Microsoft.IdentityModel.Tokens.dll</HintPath>
+    <Reference Include="Microsoft.IdentityModel.Tokens, Version=5.7.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\..\..\packages\Microsoft.IdentityModel.Tokens.5.7.0\lib\net461\Microsoft.IdentityModel.Tokens.dll</HintPath>
    </Reference>
    <Reference Include="Microsoft.Practices.TransientFaultHandling.Core, Version=5.1.1209.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
      <HintPath>..\..\..\packages\TransientFaultHandling.Core.5.1.1209.1\lib\NET4\Microsoft.Practices.TransientFaultHandling.Core.dll</HintPath>
@@ -133,8 +130,8 @@
      <RequiredTargetFramework>3.5</RequiredTargetFramework>
    </Reference>
    <Reference Include="System.Data.DataSetExtensions" />
-    <Reference Include="System.IdentityModel.Tokens.Jwt, Version=5.2.4.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
-      <HintPath>..\..\..\packages\System.IdentityModel.Tokens.Jwt.5.2.4\lib\net451\System.IdentityModel.Tokens.Jwt.dll</HintPath>
+    <Reference Include="System.IdentityModel.Tokens.Jwt, Version=5.7.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\..\..\packages\System.IdentityModel.Tokens.Jwt.5.7.0\lib\net461\System.IdentityModel.Tokens.Jwt.dll</HintPath>
    </Reference>
    <Reference Include="System.Runtime.Serialization" />
    <Reference Include="System.ServiceModel" />
@@ -601,10 +598,4 @@
      </FlavorProperties>
    </VisualStudio>
  </ProjectExtensions>
-  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
-    <PropertyGroup>
-      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
-    </PropertyGroup>
-    <Error Condition="!Exists('..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props'))" />
-  </Target>
 </Project>
--- a/src/Orchard.Web/Modules/Orchard.Azure.MediaServices/Scripts/Lib/dash.all.js
+++ b/src/Orchard.Web/Modules/Orchard.Azure.MediaServices/Scripts/Lib/dash.all.js
--- a/src/Orchard.Web/Modules/Orchard.Azure.MediaServices/Scripts/Lib/swfobject.js
+++ b/src/Orchard.Web/Modules/Orchard.Azure.MediaServices/Scripts/Lib/swfobject.js
--- a/src/Orchard.Web/Modules/Orchard.Azure.MediaServices/Tests/Microsoft.CloudMedia.Tests/Microsoft.CloudMedia.Tests.csproj
+++ b/src/Orchard.Web/Modules/Orchard.Azure.MediaServices/Tests/Microsoft.CloudMedia.Tests/Microsoft.CloudMedia.Tests.csproj
@@ -41,7 +41,6 @@
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>..\OrchardBasicCorrectness.ruleset</CodeAnalysisRuleSet>
    <PlatformTarget>AnyCPU</PlatformTarget>
    <Prefer32Bit>false</Prefer32Bit>
@@ -53,7 +52,6 @@
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
    <PlatformTarget>AnyCPU</PlatformTarget>
    <Prefer32Bit>false</Prefer32Bit>
--- a/src/Orchard.Web/Modules/Orchard.Azure.MediaServices/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Azure.MediaServices/Web.config
@@ -21,7 +21,6 @@
            </namespaces>
        </pages>
    </system.web.webPages.razor>
-    <!-- Registering Roslyn as a compiler for Razor IntelliSense. -->
    <appSettings>
        <add key="aspnet:RoslynCompilerLocation" value="..\..\bin\roslyn" />
    </appSettings>
@@ -90,8 +89,7 @@
  </runtime>
  <system.codedom>
    <compilers>
-      <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:1659;1699;1701" />
-      <compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:41008 /define:_MYTYPE=\&quot;Web\&quot; /optionInfer+" />
+      <compiler language="c#;cs;csharp" extension=".cs" warningLevel="4" compilerOptions="/langversion:7.3 /nowarn:1659;1699;1701;612;618" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
    </compilers>
  </system.codedom>
 </configuration>
--- a/src/Orchard.Web/Modules/Orchard.Azure.MediaServices/packages.config
+++ b/src/Orchard.Web/Modules/Orchard.Azure.MediaServices/packages.config
@@ -8,13 +8,13 @@
  <package id="Microsoft.AspNet.Razor" version="3.2.7" targetFramework="net48" />
  <package id="Microsoft.AspNet.WebPages" version="3.2.7" targetFramework="net48" />
  <package id="Microsoft.Azure.KeyVault.Core" version="1.0.0" targetFramework="net48" />
-  <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="2.0.1" targetFramework="net48" />
+  <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="4.1.0" targetFramework="net48" />
  <package id="Microsoft.Data.Edm" version="5.8.4" targetFramework="net48" />
  <package id="Microsoft.Data.OData" version="5.8.4" targetFramework="net48" />
  <package id="Microsoft.Data.Services.Client" version="5.8.4" targetFramework="net48" />
-  <package id="Microsoft.IdentityModel.JsonWebTokens" version="5.2.4" targetFramework="net48" />
-  <package id="Microsoft.IdentityModel.Logging" version="5.2.4" targetFramework="net48" />
-  <package id="Microsoft.IdentityModel.Tokens" version="5.2.4" targetFramework="net48" />
+  <package id="Microsoft.IdentityModel.JsonWebTokens" version="5.7.0" targetFramework="net48" />
+  <package id="Microsoft.IdentityModel.Logging" version="5.7.0" targetFramework="net48" />
+  <package id="Microsoft.IdentityModel.Tokens" version="5.7.0" targetFramework="net48" />
  <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net48" />
  <package id="Microsoft.WindowsAzure.ConfigurationManager" version="3.1.0" targetFramework="net48" />
  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net48" />
@@ -22,7 +22,7 @@
  <package id="Orchard.WindowsAzure.Diagnostics" version="2.7.0.0" targetFramework="net48" />
  <package id="Remotion.Linq" version="2.2.0" targetFramework="net48" />
  <package id="Remotion.Linq.EagerFetching" version="2.2.0" targetFramework="net48" />
-  <package id="System.IdentityModel.Tokens.Jwt" version="5.2.4" targetFramework="net48" />
+  <package id="System.IdentityModel.Tokens.Jwt" version="5.7.0" targetFramework="net48" />
  <package id="System.Spatial" version="5.8.4" targetFramework="net48" />
  <package id="TransientFaultHandling.Core" version="5.1.1209.1" targetFramework="net48" />
  <package id="windowsazure.mediaservices" version="3.4.0.0" targetFramework="net48" />
--- a/src/Orchard.Web/Modules/Orchard.Azure/Orchard.Azure.csproj
+++ b/src/Orchard.Web/Modules/Orchard.Azure/Orchard.Azure.csproj
@@ -13,7 +13,7 @@
    <RootNamespace>Orchard.Azure</RootNamespace>
    <AssemblyName>Orchard.Azure</AssemblyName>
    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
-    <MvcBuildViews>false</MvcBuildViews>
+    <LangVersion>7.3</LangVersion>
    <FileUpgradeFlags>
    </FileUpgradeFlags>
    <OldToolsVersion>4.0</OldToolsVersion>
@@ -35,7 +35,6 @@
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>..\..\..\OrchardBasicCorrectness.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
@@ -46,7 +45,6 @@
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
--- a/src/Orchard.Web/Modules/Orchard.Blogs/BlogsLocalizationExtensions/Handlers/BlogPostPartHandler.cs
+++ b/src/Orchard.Web/Modules/Orchard.Blogs/BlogsLocalizationExtensions/Handlers/BlogPostPartHandler.cs
@@ -64,7 +64,8 @@ namespace Orchard.Blogs.BlogsLocalizationExtensions.Handlers {
                var blogids = new HashSet<int> { blog.As<BlogPart>().ContentItem.Id };

                //seek for same culture blog
-                var realBlog = _localizationService.GetLocalizations(blog).SingleOrDefault(w => w.As<LocalizationPart>().Culture == blogPostCulture);
+                var realBlog = _localizationService.GetLocalizations(blog)
+                    .SingleOrDefault(w => w.Culture?.Culture == blogPostCulture.Culture);
                if (realBlog.Has<LocalizationPart>() && realBlog.As<LocalizationPart>().Culture.Id == blogPostCulture.Id) {
                    blogPost.As<ICommonPart>().Container = realBlog;
                    if (blogPost.Has<AutoroutePart>()) {
--- a/src/Orchard.Web/Modules/Orchard.Blogs/Orchard.Blogs.csproj
+++ b/src/Orchard.Web/Modules/Orchard.Blogs/Orchard.Blogs.csproj
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props" Condition="Exists('..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props')" />
  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
  <PropertyGroup>
    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -14,7 +13,7 @@
    <RootNamespace>Orchard.Blogs</RootNamespace>
    <AssemblyName>Orchard.Blogs</AssemblyName>
    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
-    <MvcBuildViews>false</MvcBuildViews>
+    <LangVersion>7.3</LangVersion>
    <FileUpgradeFlags>
    </FileUpgradeFlags>
    <OldToolsVersion>4.0</OldToolsVersion>
@@ -39,7 +38,6 @@
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>..\..\..\OrchardBasicCorrectness.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
@@ -50,13 +48,12 @@
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
  <ItemGroup>
-    <Reference Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
-      <HintPath>..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\lib\net45\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.dll</HintPath>
+    <Reference Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.4.1.0\lib\net472\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.dll</HintPath>
    </Reference>
    <Reference Include="Microsoft.CSharp" />
    <Reference Include="Microsoft.Web.Infrastructure, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
@@ -280,10 +277,4 @@
      </FlavorProperties>
    </VisualStudio>
  </ProjectExtensions>
-  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
-    <PropertyGroup>
-      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
-    </PropertyGroup>
-    <Error Condition="!Exists('..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props'))" />
-  </Target>
 </Project>
--- a/src/Orchard.Web/Modules/Orchard.Blogs/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Blogs/Web.config
@@ -21,7 +21,6 @@
            </namespaces>
        </pages>
    </system.web.webPages.razor>
-    <!-- Registering Roslyn as a compiler for Razor IntelliSense. -->
    <appSettings>
        <add key="aspnet:RoslynCompilerLocation" value="..\..\bin\roslyn" />
    </appSettings>
@@ -73,8 +72,7 @@
  </runtime>
  <system.codedom>
    <compilers>
-      <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:1659;1699;1701" />
-      <compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:41008 /define:_MYTYPE=\&quot;Web\&quot; /optionInfer+" />
+      <compiler language="c#;cs;csharp" extension=".cs" warningLevel="4" compilerOptions="/langversion:7.3 /nowarn:1659;1699;1701;612;618" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
    </compilers>
  </system.codedom>
 </configuration>
--- a/src/Orchard.Web/Modules/Orchard.Blogs/packages.config
+++ b/src/Orchard.Web/Modules/Orchard.Blogs/packages.config
@@ -3,6 +3,6 @@
  <package id="Microsoft.AspNet.Mvc" version="5.2.7" targetFramework="net48" />
  <package id="Microsoft.AspNet.Razor" version="3.2.7" targetFramework="net48" />
  <package id="Microsoft.AspNet.WebPages" version="3.2.7" targetFramework="net48" />
-  <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="2.0.1" targetFramework="net48" />
+  <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="4.1.0" targetFramework="net48" />
  <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net48" />
 </packages>
--- a/src/Orchard.Web/Modules/Orchard.Caching/Orchard.Caching.csproj
+++ b/src/Orchard.Web/Modules/Orchard.Caching/Orchard.Caching.csproj
@@ -13,7 +13,7 @@
    <RootNamespace>Orchard.Caching</RootNamespace>
    <AssemblyName>Orchard.Caching</AssemblyName>
    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
-    <MvcBuildViews>false</MvcBuildViews>
+    <LangVersion>7.3</LangVersion>
    <FileUpgradeFlags>
    </FileUpgradeFlags>
    <OldToolsVersion>4.0</OldToolsVersion>
@@ -35,7 +35,6 @@
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>..\..\..\OrchardBasicCorrectness.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
@@ -46,7 +45,6 @@
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
--- a/src/Orchard.Web/Modules/Orchard.CodeGeneration/CodeGenerationTemplates/ModuleCsProj.txt
+++ b/src/Orchard.Web/Modules/Orchard.CodeGeneration/CodeGenerationTemplates/ModuleCsProj.txt
@@ -13,7 +13,7 @@
    <RootNamespace>$$ModuleName$$</RootNamespace>
    <AssemblyName>$$ModuleName$$</AssemblyName>
    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
-    <MvcBuildViews>false</MvcBuildViews>
+    <LangVersion>7.3</LangVersion>
    <FileUpgradeFlags>
    </FileUpgradeFlags>
    <OldToolsVersion>4.0</OldToolsVersion>
@@ -33,7 +33,6 @@
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>..\..\..\OrchardBasicCorrectness.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
@@ -44,13 +43,12 @@
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
 <ItemGroup>
-    <Reference Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
-      <HintPath>..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\lib\net45\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.dll</HintPath>
+    <Reference Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.4.1.0\lib\net472\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.dll</HintPath>
      <Private>True</Private>
    </Reference>
    <Reference Include="Microsoft.CSharp" />
--- a/src/Orchard.Web/Modules/Orchard.CodeGeneration/CodeGenerationTemplates/ModulePackagesConfig.txt
+++ b/src/Orchard.Web/Modules/Orchard.CodeGeneration/CodeGenerationTemplates/ModulePackagesConfig.txt
@@ -3,6 +3,6 @@
  <package id="Microsoft.AspNet.Mvc" version="5.2.7" targetFramework="net48" />
  <package id="Microsoft.AspNet.Razor" version="3.2.7" targetFramework="net48" />
  <package id="Microsoft.AspNet.WebPages" version="3.2.7" targetFramework="net48" />
-  <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="2.0.1" targetFramework="net48" />
+  <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="4.1.0" targetFramework="net48" />
  <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net48" />
 </packages>
--- a/src/Orchard.Web/Modules/Orchard.CodeGeneration/CodeGenerationTemplates/ModuleRootWebConfig.txt
+++ b/src/Orchard.Web/Modules/Orchard.CodeGeneration/CodeGenerationTemplates/ModuleRootWebConfig.txt
@@ -21,13 +21,12 @@
            </namespaces>
        </pages>
    </system.web.webPages.razor>
-    <!-- Registering Roslyn as a compiler for Razor IntelliSense. -->
    <appSettings>
        <add key="aspnet:RoslynCompilerLocation" value="..\..\bin\roslyn" />
    </appSettings>
    <system.codedom>
        <compilers>
-            <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:latest" />
+            <compiler language="c#;cs;csharp" extension=".cs" warningLevel="4" compilerOptions="/langversion:7.3 /nowarn:1659;1699;1701;612;618" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
        </compilers>
    </system.codedom>
    <system.web>
--- a/src/Orchard.Web/Modules/Orchard.CodeGeneration/CodeGenerationTemplates/ModuleTestsCsProj.txt
+++ b/src/Orchard.Web/Modules/Orchard.CodeGeneration/CodeGenerationTemplates/ModuleTestsCsProj.txt
@@ -10,6 +10,7 @@
    <RootNamespace>$$ProjectName$$</RootNamespace>
    <AssemblyName>$$ProjectName$$</AssemblyName>
    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
+    <LangVersion>7.3</LangVersion>
    <OldToolsVersion>4.0</OldToolsVersion>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
@@ -20,7 +21,6 @@
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>..\..\..\OrchardBasicCorrectness.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
@@ -31,7 +31,6 @@
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
--- a/src/Orchard.Web/Modules/Orchard.CodeGeneration/Orchard.CodeGeneration.csproj
+++ b/src/Orchard.Web/Modules/Orchard.CodeGeneration/Orchard.CodeGeneration.csproj
@@ -14,7 +14,7 @@
    <RootNamespace>Orchard.CodeGeneration</RootNamespace>
    <AssemblyName>Orchard.CodeGeneration</AssemblyName>
    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
-    <MvcBuildViews>false</MvcBuildViews>
+    <LangVersion>7.3</LangVersion>
    <UseIISExpress>false</UseIISExpress>
    <FileUpgradeFlags>
    </FileUpgradeFlags>
@@ -37,7 +37,6 @@
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>..\..\..\OrchardBasicCorrectness.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
@@ -48,7 +47,6 @@
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
  <ItemGroup>
--- a/src/Orchard.Web/Modules/Orchard.Comments/Orchard.Comments.csproj
+++ b/src/Orchard.Web/Modules/Orchard.Comments/Orchard.Comments.csproj
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props" Condition="Exists('..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props')" />
  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
  <PropertyGroup>
    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -14,7 +13,7 @@
    <RootNamespace>Orchard.Comments</RootNamespace>
    <AssemblyName>Orchard.Comments</AssemblyName>
    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
-    <MvcBuildViews>false</MvcBuildViews>
+    <LangVersion>7.3</LangVersion>
    <FileUpgradeFlags>
    </FileUpgradeFlags>
    <OldToolsVersion>4.0</OldToolsVersion>
@@ -39,7 +38,6 @@
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>..\..\..\OrchardBasicCorrectness.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
@@ -50,13 +48,12 @@
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
-    <LangVersion>latest</LangVersion>
    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
    <Prefer32Bit>false</Prefer32Bit>
  </PropertyGroup>
  <ItemGroup>
-    <Reference Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
-      <HintPath>..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\lib\net45\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.dll</HintPath>
+    <Reference Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.4.1.0\lib\net472\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.dll</HintPath>
    </Reference>
    <Reference Include="Microsoft.CSharp" />
    <Reference Include="Microsoft.Web.Infrastructure, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
@@ -271,10 +268,4 @@
      </FlavorProperties>
    </VisualStudio>
  </ProjectExtensions>
-  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
-    <PropertyGroup>
-      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
-    </PropertyGroup>
-    <Error Condition="!Exists('..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props'))" />
-  </Target>
 </Project>
--- a/src/Orchard.Web/Modules/Orchard.Comments/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Comments/Web.config
@@ -21,7 +21,6 @@
            </namespaces>
        </pages>
    </system.web.webPages.razor>
-    <!-- Registering Roslyn as a compiler for Razor IntelliSense. -->
    <appSettings>
        <add key="aspnet:RoslynCompilerLocation" value="..\..\bin\roslyn" />
    </appSettings>
@@ -73,8 +72,7 @@
  </runtime>
  <system.codedom>
    <compilers>
-      <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:1659;1699;1701" />
-      <compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:41008 /define:_MYTYPE=\&quot;Web\&quot; /optionInfer+" />
+      <compiler language="c#;cs;csharp" extension=".cs" warningLevel="4" compilerOptions="/langversion:7.3 /nowarn:1659;1699;1701;612;618" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
    </compilers>
  </system.codedom>
 </configuration>
--- a/src/Orchard.Web/Modules/Orchard.Comments/packages.config
+++ b/src/Orchard.Web/Modules/Orchard.Comments/packages.config
@@ -3,6 +3,6 @@
  <package id="Microsoft.AspNet.Mvc" version="5.2.7" targetFramework="net48" />
  <package id="Microsoft.AspNet.Razor" version="3.2.7" targetFramework="net48" />
  <package id="Microsoft.AspNet.WebPages" version="3.2.7" targetFramework="net48" />
-  <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="2.0.1" targetFramework="net48" />
+  <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="4.1.0" targetFramework="net48" />
  <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net48" />
 </packages>
--- a/Show More
+++ b/Show More