1

CPF.Toolkit.Demo/MainView.cs

@@ -6,6 +6,7 @@ using CPF.Drawing;
 using CPF.Shapes;
 using CPF.Styling;
 using CPF.Svg;
+using CPF.Toolkit.Controls;
 using CPF.Toolkit.Dialogs;
 using System;
 using System.Collections.Generic;
@@ -70,6 +71,11 @@ namespace CPF.Toolkit.Demo
                         Content = "loading",
                         Commands = { { nameof(Button.Click),(s,e) => vm.LoadingTest() } }
                     },
+                    new AsyncButton
+                    {
+                        Content = "AsyncButton",
+                        Command = vm.AsyncClick,
+                    },
                 }
             }));
         }

CPF.Toolkit.Demo/MainViewModel.cs

@@ -1,4 +1,5 @@
 using CPF.Controls;
+using CPF.Toolkit.Input;
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
@@ -47,5 +48,11 @@ namespace CPF.Toolkit.Demo
             //});
             //this.Dialog.Sucess(result);
         }
+
+        public IAsyncCommand AsyncClick => new AsyncCommand(async () =>
+        {
+            await Task.Delay(5000);
+            this.Dialog.Alert("test");
+        });
     }
 }

CPF.Toolkit/CPF.Toolkit.csproj

@@ -21,7 +21,5 @@
   <ItemGroup>
     <ProjectReference Include="..\CPF\CPF.csproj" />
   </ItemGroup>
-	<ItemGroup>
+
-		<PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
-	</ItemGroup>
 </Project>

CPF.Toolkit/Controls/AsyncButton.cs

@@ -0,0 +1,31 @@
+using CPF.Controls;
+using CPF.Toolkit.Input;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace CPF.Toolkit.Controls
+{
+    public class AsyncButton : Button
+    {
+
+        protected override void InitializeComponent()
+        {
+            base.InitializeComponent();
+            this.Triggers.Add(nameof(IsEnabled), Relation.Me, null, (nameof(Background), "224,224,224"));
+        }
+
+        public IAsyncCommand Command { get; set; }
+
+        protected override async void OnClick(RoutedEventArgs e)
+        {
+            this.IsEnabled = false;
+            base.OnClick(e);
+            if (this.Command != null)
+            {
+                await this.Command.ExecuteAsync();
+            }
+            this.IsEnabled = true;
+        }
+    }
+}

CPF.Toolkit/Input/AsyncCommand.cs

@@ -0,0 +1,51 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace CPF.Toolkit.Input
+{
+    public class AsyncCommand : IAsyncCommand
+    {
+        public AsyncCommand(Func<Task> execute)
+        {
+            this.execute = execute;
+        }
+
+        private readonly Func<Task> execute;
+        private Task executionTask;
+
+        public Task ExecutionTask
+        {
+            get => this.executionTask;
+            private set
+            {
+                if (ReferenceEquals(this.executionTask, value))
+                {
+                    return;
+                }
+
+                this.executionTask = value;
+                bool isAlreadyCompletedOrNull = value?.IsCompleted ?? true;
+                if (isAlreadyCompletedOrNull)
+                {
+                    return;
+                }
+            }
+        }
+
+        public bool IsRunning => ExecutionTask is { IsCompleted: false };
+
+
+        public Task ExecuteAsync()
+        {
+            Task executionTask = ExecutionTask;
+            if (this.execute is not null)
+            {
+                executionTask = ExecutionTask = this.execute();
+            }
+            return executionTask;
+        }
+    }
+}

CPF.Toolkit/Input/IAsyncCommand.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CPF.Toolkit.Input
+{
+    public interface IAsyncCommand
+    {
+        Task ExecutionTask { get; }
+        bool IsRunning { get; }
+        Task ExecuteAsync();
+    }
+}

ConsoleApp1.sln

@@ -65,6 +65,11 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CPF.Toolkit", "CPF.Toolkit\
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CPF.Toolkit.Demo", "CPF.Toolkit.Demo\CPF.Toolkit.Demo.csproj", "{AEA7FF33-1621-4A0A-9C08-6C4CB10C76FF}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "解决方案项", "解决方案项", "{C2358108-0235-4151-97F6-0283CFF98093}"
+	ProjectSection(SolutionItems) = preProject
+		Directory.Build.props = Directory.Build.props
+	EndProjectSection
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU

Directory.Build.props

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project>
+	<PropertyGroup>
+		<LangVersion>preview</LangVersion>
+	</PropertyGroup>
+</Project>