Merge pull request #42928 from JoeRobich/workaround-platformexception

Use the Trivial temporary storage service on non-windows platforms

src/Workspaces/Core/Portable/TemporaryStorage/TemporaryStorageServiceFactory.cs

@@ -19,7 +19,7 @@
 
 namespace Microsoft.CodeAnalysis.Host
 {
-    [ExportWorkspaceServiceFactory(typeof(ITemporaryStorageService), ServiceLayer.Host), Shared]
+    [ExportWorkspaceServiceFactory(typeof(ITemporaryStorageService), ServiceLayer.Default), Shared]
     internal partial class TemporaryStorageServiceFactory : IWorkspaceServiceFactory
     {
         [ImportingConstructor]
@@ -31,7 +31,13 @@ public TemporaryStorageServiceFactory()
         public IWorkspaceService CreateService(HostWorkspaceServices workspaceServices)
         {
             var textFactory = workspaceServices.GetService<ITextFactoryService>();
-            return new TemporaryStorageService(textFactory);
+
+            // MemoryMapped files which are used by the TemporaryStorageService are present in .NET Framework (including Mono)
+            // and .NET Core Windows. For non-Windows .NET Core scenarios, we can return the TrivialTemporaryStorageService
+            // until https://github.com/dotnet/roslyn/issues/42178 is fixed.
+            return PlatformInformation.IsWindows || PlatformInformation.IsRunningOnMono
+                ? (ITemporaryStorageService)new TemporaryStorageService(textFactory)
+                : TrivialTemporaryStorageService.Instance;
         }
 
         /// <summary>

src/Workspaces/Core/Portable/Workspace/Host/TemporaryStorage/TrivialTemporaryStorageService.cs

@@ -3,22 +3,19 @@
 // See the LICENSE file in the project root for more information.
 
 using System;
-using System.Composition;
 using System.IO;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.CodeAnalysis.Host;
-using Microsoft.CodeAnalysis.Host.Mef;
 using Microsoft.CodeAnalysis.Text;
 
 namespace Microsoft.CodeAnalysis
 {
-    [ExportWorkspaceService(typeof(ITemporaryStorageService)), Shared]
     internal sealed class TrivialTemporaryStorageService : ITemporaryStorageService
     {
-        [ImportingConstructor]
-        [Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
-        public TrivialTemporaryStorageService()
+        public static readonly TrivialTemporaryStorageService Instance = new TrivialTemporaryStorageService();
+
+        private TrivialTemporaryStorageService()
         {
         }