From 3bcbcb4f048585be149865630ccae44b93b897c5 Mon Sep 17 00:00:00 2001
From: Renaud Paquay <rpaquay@microsoft.com>
Date: Thu, 9 Jun 2011 08:38:16 -0700
Subject: [PATCH] #17920: Fix multi-threading issue

Work Item: 17920

--HG--
branch : 1.x
---
 .../Orchard/HostContext/CommandHostContextProvider.cs      | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/Tools/Orchard/HostContext/CommandHostContextProvider.cs b/src/Tools/Orchard/HostContext/CommandHostContextProvider.cs
index 082bc3c84..12505b9db 100644
--- a/src/Tools/Orchard/HostContext/CommandHostContextProvider.cs
+++ b/src/Tools/Orchard/HostContext/CommandHostContextProvider.cs
@@ -113,7 +113,12 @@ namespace Orchard.HostContext {
         }
 
         private static CommandHost CreateWorkerAppDomainWithHost(string virtualPath, string physicalPath, Type hostType) {
-            ClientBuildManager clientBuildManager = new ClientBuildManager(virtualPath, physicalPath);
+            var clientBuildManager = new ClientBuildManager(virtualPath, physicalPath);
+            // Fix for http://orchard.codeplex.com/workitem/17920
+            // By forcing the CBM to build App_Code, etc, we ensure that the ASP.NET BuildManager
+            // is in a state where it can safely (i.e. in a multi-threaded safe way) process
+            // multiple concurrent calls to "GetCompiledAssembly".
+            clientBuildManager.CompileApplicationDependencies();
             return (CommandHost)clientBuildManager.CreateObject(hostType, false);
         }
     }