Encountered exception in the MEF composition at startup

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## Issue Description ##
Exception reported in C# output window when launching VSCode:
```
2026-07-31 09:17:49.881 [info] fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
2026-07-31 09:17:49.881 [info] Encountered exception in the MEF composition
2026-07-31 09:17:49.882 [info] Microsoft.VisualStudio.Composition.PartDiscoveryException: Failure while scanning type "Microsoft.VisualStudio.DesignTools.CodeAnalysis.AutoInsert.XamlAutoInsertLanguageService".
2026-07-31 09:17:49.882 [info] ---> System.TypeLoadException: Could not resolve type 'Microsoft.VisualStudio.DesignTools.CodeAnalysis.AutoInsert.__VsMefMetadataView_Microsoft_VisualStudio_DesignTools_CodeAnalysis_AutoInsert_IAutoInsertMetadata' in assembly 'Microsoft.VisualStudio.DesignTools.CodeAnalysis, Version=18.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.
2026-07-31 09:17:49.882 [info] at System.Reflection.TypeNameResolver.GetTypeFromDefaultAssemblies(String typeName, ReadOnlySpan`1 nestedTypeNames, TypeName parsedName)
2026-07-31 09:17:49.882 [info] at System.Reflection.TypeNameResolver.GetType(String escapedTypeName, ReadOnlySpan`1 nestedTypeNames, TypeName parsedName)
2026-07-31 09:17:49.883 [info] at System.Reflection.TypeNameResolver.GetSimpleType(TypeName typeName)
2026-07-31 09:17:49.883 [info] at System.Reflection.TypeNameResolver.Resolve(TypeName typeName)
2026-07-31 09:17:49.883 [info] at System.Reflection.TypeNameResolver.GetTypeHelper(ReadOnlySpan`1 typeName, RuntimeAssembly requestingAssembly, Boolean throwOnError, Boolean requireAssemblyQualifiedName, IntPtr unsafeAccessorMethod)
2026-07-31 09:17:49.884 [info] at System.Reflection.TypeNameResolver.GetTypeHelper(Char* pTypeName, RuntimeAssembly requestingAssembly, Boolean throwOnError, Boolean requireAssemblyQualifiedName, IntPtr unsafeAccessorMethod)
2026-07-31 09:17:49.884 [info] at System.Reflection.CustomAttribute.CreateCustomAttributeInstance(RuntimeModule module, RuntimeType type, IRuntimeMethodInfo ctor, IntPtr& blob, IntPtr blobEnd, Int32& namedArgs)
2026-07-31 09:17:49.884 [info] at System.Reflection.CustomAttribute.AddCustomAttributes(ListBuilder`1& attributes, RuntimeModule decoratedModule, Int32 decoratedMetadataToken, RuntimeType attributeFilterType, Boolean mustBeInheritable, ListBuilder`1 derivedAttributes)
2026-07-31 09:17:49.884 [info] at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeModule decoratedModule, Int32 decoratedMetadataToken, Int32 pcaCount, RuntimeType attributeFilterType)
2026-07-31 09:17:49.885 [info] at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeType type, RuntimeType caType, Boolean inherit)
2026-07-31 09:17:49.885 [info] at Microsoft.VisualStudio.Composition.AttributeServices.GetAttributes[T](ICustomAttributeProvider attributeProvider)
2026-07-31 09:17:49.885 [info] at Microsoft.VisualStudio.Composition.MetadataViewImplProxy.FindImplClassConstructor(Type metadataType)
2026-07-31 09:17:49.885 [info] at Microsoft.VisualStudio.Composition.ImportMetadataViewConstraint.GetRequiredMetadata(TypeRef metadataViewRef, Resolver resolver)
2026-07-31 09:17:49.885 [info] at Microsoft.VisualStudio.Composition.ImportMetadataViewConstraint.GetConstraint(TypeRef metadataTypeRef, Resolver resolver)
2026-07-31 09:17:49.885 [info] at Microsoft.VisualStudio.Composition.PartDiscovery.GetMetadataViewConstraints(Type receivingType, Boolean importMany)
2026-07-31 09:17:49.886 [info] at Microsoft.VisualStudio.Composition.AttributedPartDiscovery.TryCreateImportDefinition(Type importingType, ICustomAttributeProvider member, ImmutableHashSet`1 importConstraints, ImportDefinition& importDefinition)
2026-07-31 09:17:49.886 [info] at Microsoft.VisualStudio.Composition.AttributedPartDiscovery.CreateImport(ParameterInfo parameter, ImmutableHashSet`1 importConstraints)
2026-07-31 09:17:49.886 [info] at Microsoft.VisualStudio.Composition.AttributedPartDiscovery.CreatePart(Type partType, Boolean typeExplicitlyRequested)
2026-07-31 09:17:49.886 [info] at Microsoft.VisualStudio.Composition.PartDiscovery.CombinedPartDiscovery.CreatePart(Type partType, Boolean typeExplicitlyRequested)
2026-07-31 09:17:49.886 [info] at Microsoft.VisualStudio.Composition.PartDiscovery.<>c__DisplayClass32_0.b__0(Type type)
2026-07-31 09:17:49.886 [info] --- End of inner exception stack trace ---
2026-07-31 09:17:49.888 [info] fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
2026-07-31 09:17:49.888 [info] Encountered exception in the MEF composition
2026-07-31 09:17:49.888 [info] Microsoft.VisualStudio.Composition.PartDiscoveryException: ReflectionTypeLoadException while enumerating types in assembly "c:\Users\jtsombakos\.vscode\extensions\ms-dotnettools.csharp-2.146.2-win32-x64\.xamlTools\Microsoft.VisualStudio.DesignTools.CodeAnalysis.dll". Results will be incomplete.
2026-07-31 09:17:49.888 [info] ---> System.Reflection.ReflectionTypeLoadException: Unable to load one or more of the requested types.
2026-07-31 09:17:49.889 [info] Could not load file or assembly 'Microsoft.VisualStudio.Composition, Version=18.9.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The system cannot find the file specified.
2026-07-31 09:17:49.889 [info] at System.Reflection.RuntimeModule.GetDefinedTypes()
2026-07-31 09:17:49.889 [info] at System.Reflection.RuntimeModule.GetTypes()
2026-07-31 09:17:49.889 [info] at Microsoft.VisualStudio.Composition.PartDiscovery.<>c__DisplayClass33_0.b__0(Assembly a)
2026-07-31 09:17:49.889 [info] System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.VisualStudio.Composition, Version=18.9.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The system cannot find the file specified.
2026-07-31 09:17:49.890 [info] File name: 'Microsoft.VisualStudio.Composition, Version=18.9.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
2026-07-31 09:17:49.890 [info] --- End of inner exception stack trace ---
2026-07-31 09:17:49.890 [info] fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
2026-07-31 09:17:49.890 [info] Encountered errors in the MEF composition:
2026-07-31 09:17:49.890 [info] ----- CompositionError level 1 ------
2026-07-31 09:17:49.890 [info] Microsoft.CodeAnalysis.ExternalAccess.Copilot.Internal.SemanticSearch.CopilotSemanticSearchQueryExecutor.ctor(workspaceProvider): expected exactly 1 export matching constraints:
2026-07-31 09:17:49.891 [info] Contract name: Microsoft.CodeAnalysis.Host.IHostWorkspaceProvider
2026-07-31 09:17:49.891 [info] TypeIdentityName: Microsoft.CodeAnalysis.Host.IHostWorkspaceProvider
2026-07-31 09:17:49.891 [info] but found 0.
2026-07-31 09:17:49.891 [info] part definition Microsoft.CodeAnalysis.ExternalAccess.Copilot.Internal.SemanticSearch.CopilotSemanticSearchQueryExecutor
2026-07-31 09:17:49.891 [info]
2026-07-31 09:17:49.892 [info] Microsoft.CodeAnalysis.ExternalAccess.Copilot.Internal.CodeMapper.CSharpMapCodeService.ctor(service): expected exactly 1 export matching constraints:
2026-07-31 09:17:49.892 [info] Contract name: Microsoft.CodeAnalysis.ExternalAccess.Copilot.CodeMapper.ICSharpCopilotMapCodeService
2026-07-31 09:17:49.892 [info] TypeIdentityName: Microsoft.CodeAnalysis.ExternalAccess.Copilot.CodeMapper.ICSharpCopilotMapCodeService
2026-07-31 09:17:49.892 [info] but found 0.
2026-07-31 09:17:49.893 [info] part definition Microsoft.CodeAnalysis.ExternalAccess.Copilot.Internal.CodeMapper.CSharpMapCodeService
2026-07-31 09:17:49.893 [info]
2026-07-31 09:17:49.893 [info] Microsoft.VisualStudio.DesignTools.CodeAnalysis.Handlers.OnAutoInsertHandler.ctor(autoInsertService): expected exactly 1 export matching constraints:
2026-07-31 09:17:49.893 [info] Contract name: Microsoft.VisualStudio.DesignTools.CodeAnalysis.AutoInsert.IXamlAutoInsertService
2026-07-31 09:17:49.893 [info] TypeIdentityName: Microsoft.VisualStudio.DesignTools.CodeAnalysis.AutoInsert.IXamlAutoInsertService
2026-07-31 09:17:49.893 [info] but found 0.
2026-07-31 09:17:49.894 [info] part definition Microsoft.VisualStudio.DesignTools.CodeAnalysis.Handlers.OnAutoInsertHandler
2026-07-31 09:17:49.894 [info]
2026-07-31 09:17:49.894 [info] Microsoft.CodeAnalysis.ExternalAccess.Pythia.PythiaSignatureHelpProvider.ctor(implementation): expected exactly 1 export matching constraints:
2026-07-31 09:17:49.894 [info] Contract name: Microsoft.CodeAnalysis.ExternalAccess.Pythia.Api.IPythiaSignatureHelpProviderImplementation
2026-07-31 09:17:49.894 [info] TypeIdentityName: Microsoft.CodeAnalysis.ExternalAccess.Pythia.Api.IPythiaSignatureHelpProviderImplementation
2026-07-31 09:17:49.894 [info] but found 0.
2026-07-31 09:17:49.895 [info] part definition Microsoft.CodeAnalysis.ExternalAccess.Pythia.PythiaSignatureHelpProvider
2026-07-31 09:17:49.895 [info]
2026-07-31 09:17:49.895 [info]
2026-07-31 09:17:49.895 [info] Microsoft.VisualStudio.Composition.CompositionFailedException: Errors exist in the composition.
2026-07-31 09:17:49.895 [info] at Microsoft.VisualStudio.Composition.CompositionConfiguration.ThrowOnErrors()
2026-07-31 09:17:49.895 [info] at Microsoft.CodeAnalysis.Remote.ExportProviderBuilder.CheckForAndReportCompositionErrors(CompositionConfiguration configuration, ComposableCatalog catalog) in /_/src/Workspaces/Remote/Core/ExportProviderBuilder.cs:line 205

```

## Steps to Reproduce ##
Launch VSCode with C# active.

## Expected Behavior ##
No Errors
## Actual Behavior ##
Errors in otuput window

### Issue Details

Item|Value
---|---
Issue Category|Bug
Target|C#
VS Code Version|Code 1.131.0 (e4c7e7b1d6d060162f4aa7f8225271b67ce1df75, 2026-07-28T10:51:25Z)
OS Version|Windows_NT x64 10.0.26200
Extension Identifier|ms-dotnettools.csharp
Extension Version|2.146.2
Extension Publisher|ms-dotnettools

Extension Data

### Logs ###

### C# log ###

```
2026-07-31 09:11:10.120 [info] Locating .NET runtime version 10.0.5
2026-07-31 09:11:10.801 [info] Dotnet path: C:\Program Files\dotnet\dotnet.exe
2026-07-31 09:11:10.801 [info] Activating C# + C# Dev Kit...
2026-07-31 09:11:18.410 [info] Locating .NET runtime version 10.0.5
2026-07-31 09:11:19.506 [info] Dotnet path: C:\Program Files\dotnet\dotnet.exe
2026-07-31 09:11:19.506 [info] Activating C# + C# Dev Kit...
2026-07-31 09:11:20.806 [info] info: Program[0]
2026-07-31 09:11:20.806 [info] Server information:
2026-07-31 09:11:20.806 [info] info: Program[0]
2026-07-31 09:11:20.806 [info] Assembly informational version: 5.11.0-1.26379.2+d315a4a87b8d77677caf6ded6c2b33ca068c5cd7
2026-07-31 09:11:20.806 [info] info: Program[0]
2026-07-31 09:11:20.808 [info] Executable path: c:\Users\jtsombakos\.vscode\extensions\ms-dotnettools.csharp-2.147.94-win32-x64\.roslyn\Microsoft.CodeAnalysis.LanguageServer.exe
2026-07-31 09:11:20.808 [info] info: Program[0]
2026-07-31 09:11:20.808 [info] Process ID: 36020
2026-07-31 09:11:21.393 [info] info: Program[0]
2026-07-31 09:11:21.394 [info] Monitoring client process 14484 for exit
2026-07-31 09:11:21.394 [info] info: Program[0]
2026-07-31 09:11:21.394 [info] Language server initialized
2026-07-31 09:11:23.747 [info] [initialized] [Microsoft.CodeAnalysis.LanguageServer.FileBasedPrograms.FileBasedProgramsEntryPointDiscovery] Finished discovery in 'e:\source\AthenaTest' in 21 milliseconds
2026-07-31 09:11:23.809 [info] [Razor.LanguageClient.Cohost.RazorCohostDynamicRegistrationService] Requesting 27 Razor cohost registrations.
2026-07-31 09:11:23.829 [info] [initialized] [Razor] Razor extension startup finished.
2026-07-31 09:11:32.404 [info] [WorkspaceProjectFactoryService] Project E:\source\AthenaTest\AppHost\AppHost.csproj loaded by C# Dev Kit
2026-07-31 09:11:32.419 [info] [WorkspaceProjectFactoryService] Project E:\source\AthenaTest\ModMed.Service\ModMed.Service.csproj loaded by C# Dev Kit
2026-07-31 09:11:32.422 [info] [WorkspaceProjectFactoryService] Project E:\source\AthenaTest\AthenaTest\AthenaTest.csproj loaded by C# Dev Kit
2026-07-31 09:11:32.424 [info] [WorkspaceProjectFactoryService] Project E:\source\AthenaTest\NextGen.Service\NextGen.Service.csproj loaded by C# Dev Kit
2026-07-31 09:11:32.426 [info] [WorkspaceProjectFactoryService] Project E:\source\AthenaTest\ServiceDefaults\ServiceDefaults.csproj loaded by C# Dev Kit
2026-07-31 09:11:32.428 [info] [WorkspaceProjectFactoryService] Project E:\source\AthenaTest\AthenaTest.Service\AthenaTest.Service.csproj loaded by C# Dev Kit
2026-07-31 09:17:01.313 [info] Installing C# dependencies...
2026-07-31 09:17:01.313 [info]

2026-07-31 09:17:01.313 [info] Platform: win32, x86_64

2026-07-31 09:17:01.313 [info]

2026-07-31 09:17:01.313 [info] Downloading package 'Language server for Roslyn Copilot integration'
2026-07-31 09:17:02.769 [info] (47 KB)
2026-07-31 09:17:02.769 [info] .......
2026-07-31 09:17:02.769 [info] .......
2026-07-31 09:17:02.770 [info] ......
2026-07-31 09:17:02.770 [info] Done!

2026-07-31 09:17:02.771 [info] Validating download...

2026-07-31 09:17:02.772 [info] Integrity Check succeeded.

2026-07-31 09:17:02.772 [info] Installing package 'Language server for Roslyn Copilot integration'

2026-07-31 09:17:02.772 [info]

2026-07-31 09:17:03.686 [info] Downloading package 'VSWebAssemblyBridge (Platform Agnostic)'
2026-07-31 09:17:04.120 [info] (4143 KB)
2026-07-31 09:17:04.120 [info] .
2026-07-31 09:17:04.174 [info]
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2026-07-31 09:17:04.776 [info]
2026-07-31 09:17:04.779 [info] Done!

2026-07-31 09:17:04.790 [info] Validating download...

2026-07-31 09:17:04.791 [info] Integrity Check succeeded.

2026-07-31 09:17:04.791 [info] Installing package 'VSWebAssemblyBridge (Platform Agnostic)'

2026-07-31 09:17:04.791 [info]

2026-07-31 09:17:04.966 [info] Finished

2026-07-31 09:17:04.966 [info]

2026-07-31 09:17:06.015 [info] Locating .NET runtime version 10.0.5
2026-07-31 09:17:06.111 [info] Dotnet path: C:\Program Files\dotnet\dotnet.exe
2026-07-31 09:17:06.111 [info] Activating C# + C# Dev Kit...
2026-07-31 09:17:07.392 [info] info: Program[0]
2026-07-31 09:17:07.392 [info] Server information:
2026-07-31 09:17:07.394 [info] info: Program[0]
2026-07-31 09:17:07.394 [info] Assembly informational version: 5.10.0-1.26352.10+83ca1a6465bb861e28a51cdbb4b56074b69cb5eb
2026-07-31 09:17:07.394 [info] info: Program[0]
2026-07-31 09:17:07.395 [info] Executable path: c:\Users\jtsombakos\.vscode\extensions\ms-dotnettools.csharp-2.146.2-win32-x64\.roslyn\Microsoft.CodeAnalysis.LanguageServer.exe
2026-07-31 09:17:07.395 [info] info: Program[0]
2026-07-31 09:17:07.395 [info] Process ID: 34440
2026-07-31 09:17:09.333 [info] fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
2026-07-31 09:17:09.333 [info] Encountered exception in the MEF composition
2026-07-31 09:17:09.334 [info] Microsoft.VisualStudio.Composition.PartDiscoveryException: Failure while scanning type "Microsoft.VisualStudio.DesignTools.CodeAnalysis.AutoInsert.XamlAutoInsertLanguageService".
2026-07-31 09:17:09.334 [info] ---> System.TypeLoadException: Could not resolve type 'Microsoft.VisualStudio.DesignTools.CodeAnalysis.AutoInsert.__VsMefMetadataView_Microsoft_VisualStudio_DesignTools_CodeAnalysis_AutoInsert_IAutoInsertMetadata' in assembly 'Microsoft.VisualStudio.DesignTools.CodeAnalysis, Version=18.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.
2026-07-31 09:17:09.335 [info] at System.Reflection.TypeNameResolver.GetTypeFromDefaultAssemblies(String typeName, ReadOnlySpan`1 nestedTypeNames, TypeName parsedName)
2026-07-31 09:17:09.335 [info] at System.Reflection.TypeNameResolver.GetType(String escapedTypeName, ReadOnlySpan`1 nestedTypeNames, TypeName parsedName)
2026-07-31 09:17:09.335 [info] at System.Reflection.TypeNameResolver.GetSimpleType(TypeName typeName)
2026-07-31 09:17:09.336 [info] at System.Reflection.TypeNameResolver.Resolve(TypeName typeName)
2026-07-31 09:17:09.336 [info] at System.Reflection.TypeNameResolver.GetTypeHelper(ReadOnlySpan`1 typeName, RuntimeAssembly requestingAssembly, Boolean throwOnError, Boolean requireAssemblyQualifiedName, IntPtr unsafeAccessorMethod)
2026-07-31 09:17:09.336 [info] at System.Reflection.TypeNameResolver.GetTypeHelper(Char* pTypeName, RuntimeAssembly requestingAssembly, Boolean throwOnError, Boolean requireAssemblyQualifiedName, IntPtr unsafeAccessorMethod)
2026-07-31 09:17:09.336 [info] at System.Reflection.CustomAttribute.CreateCustomAttributeInstance(RuntimeModule module, RuntimeType type, IRuntimeMethodInfo ctor, IntPtr& blob, IntPtr blobEnd, Int32& namedArgs)
2026-07-31 09:17:09.336 [info] at System.Reflection.CustomAttribute.AddCustomAttributes(ListBuilder`1& attributes, RuntimeModule decoratedModule, Int32 decoratedMetadataToken, RuntimeType attributeFilterType, Boolean mustBeInheritable, ListBuilder`1 derivedAttributes)
2026-07-31 09:17:09.337 [info] at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeModule decoratedModule, Int32 decoratedMetadataToken, Int32 pcaCount, RuntimeType attributeFilterType)
2026-07-31 09:17:09.337 [info] at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeType type, RuntimeType caType, Boolean inherit)
2026-07-31 09:17:09.337 [info] at Microsoft.VisualStudio.Composition.AttributeServices.GetAttributes[T](ICustomAttributeProvider attributeProvider)
2026-07-31 09:17:09.337 [info] at Microsoft.VisualStudio.Composition.MetadataViewImplProxy.FindImplClassConstructor(Type metadataType)
2026-07-31 09:17:09.337 [info] at Microsoft.VisualStudio.Composition.ImportMetadataViewConstraint.GetRequiredMetadata(TypeRef metadataViewRef, Resolver resolver)
2026-07-31 09:17:09.337 [info] at Microsoft.VisualStudio.Composition.ImportMetadataViewConstraint.GetConstraint(TypeRef metadataTypeRef, Resolver resolver)
2026-07-31 09:17:09.338 [info] at Microsoft.VisualStudio.Composition.PartDiscovery.GetMetadataViewConstraints(Type receivingType, Boolean importMany)
2026-07-31 09:17:09.338 [info] at Microsoft.VisualStudio.Composition.AttributedPartDiscovery.TryCreateImportDefinition(Type importingType, ICustomAttributeProvider member, ImmutableHashSet`1 importConstraints, ImportDefinition& importDefinition)
2026-07-31 09:17:09.338 [info] at Microsoft.VisualStudio.Composition.AttributedPartDiscovery.CreateImport(ParameterInfo parameter, ImmutableHashSet`1 importConstraints)
2026-07-31 09:17:09.338 [info] at Microsoft.VisualStudio.Composition.AttributedPartDiscovery.CreatePart(Type partType, Boolean typeExplicitlyRequested)
2026-07-31 09:17:09.339 [info] at Microsoft.VisualStudio.Composition.PartDiscovery.CombinedPartDiscovery.CreatePart(Type partType, Boolean typeExplicitlyRequested)
2026-07-31 09:17:09.339 [info] at Microsoft.VisualStudio.Composition.PartDiscovery.<>c__DisplayClass32_0.b__0(Type type)
2026-07-31 09:17:09.339 [info] --- End of inner exception stack trace ---
2026-07-31 09:17:09.339 [info] fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
2026-07-31 09:17:09.339 [info] Encountered exception in the MEF composition
2026-07-31 09:17:09.339 [info] Microsoft.VisualStudio.Composition.PartDiscoveryException: ReflectionTypeLoadException while enumerating types in assembly "c:\Users\jtsombakos\.vscode\extensions\ms-dotnettools.csharp-2.146.2-win32-x64\.xamlTools\Microsoft.VisualStudio.DesignTools.CodeAnalysis.dll". Results will be incomplete.
2026-07-31 09:17:09.340 [info] ---> System.Reflection.ReflectionTypeLoadException: Unable to load one or more of the requested types.
2026-07-31 09:17:09.340 [info] Could not load file or assembly 'Microsoft.VisualStudio.Composition, Version=18.9.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The system cannot find the file specified.
2026-07-31 09:17:09.340 [info] at System.Reflection.RuntimeModule.GetDefinedTypes()
2026-07-31 09:17:09.340 [info] at System.Reflection.RuntimeModule.GetTypes()
2026-07-31 09:17:09.340 [info] at Microsoft.VisualStudio.Composition.PartDiscovery.<>c__DisplayClass33_0.b__0(Assembly a)
2026-07-31 09:17:09.340 [info] System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.VisualStudio.Composition, Version=18.9.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The system cannot find the file specified.
2026-07-31 09:17:09.341 [info] File name: 'Microsoft.VisualStudio.Composition, Version=18.9.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
2026-07-31 09:17:09.341 [info] --- End of inner exception stack trace ---
2026-07-31 09:17:09.361 [info] fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
2026-07-31 09:17:09.362 [info] Encountered errors in the MEF composition:
2026-07-31 09:17:09.362 [info] ----- CompositionError level 1 ------
2026-07-31 09:17:09.362 [info] Microsoft.CodeAnalysis.ExternalAccess.Copilot.Internal.CodeMapper.CSharpMapCodeService.ctor(service): expected exactly 1 export matching constraints:
2026-07-31 09:17:09.362 [info] Contract name: Microsoft.CodeAnalysis.ExternalAccess.Copilot.CodeMapper.ICSharpCopilotMapCodeService
2026-07-31 09:17:09.363 [info] TypeIdentityName: Microsoft.CodeAnalysis.ExternalAccess.Copilot.CodeMapper.ICSharpCopilotMapCodeService
2026-07-31 09:17:09.363 [info] but found 0.
2026-07-31 09:17:09.363 [info] part definition Microsoft.CodeAnalysis.ExternalAccess.Copilot.Internal.CodeMapper.CSharpMapCodeService
2026-07-31 09:17:09.363 [info]
2026-07-31 09:17:09.363 [info] Microsoft.CodeAnalysis.ExternalAccess.Copilot.Internal.SemanticSearch.CopilotSemanticSearchQueryExecutor.ctor(workspaceProvider): expected exactly 1 export matching constraints:
2026-07-31 09:17:09.363 [info] Contract name: Microsoft.CodeAnalysis.Host.IHostWorkspaceProvider
2026-07-31 09:17:09.364 [info] TypeIdentityName: Microsoft.CodeAnalysis.Host.IHostWorkspaceProvider
2026-07-31 09:17:09.364 [info] but found 0.
2026-07-31 09:17:09.364 [info] part definition Microsoft.CodeAnalysis.ExternalAccess.Copilot.Internal.SemanticSearch.CopilotSemanticSearchQueryExecutor
2026-07-31 09:17:09.364 [info]
2026-07-31 09:17:09.364 [info] Microsoft.CodeAnalysis.ExternalAccess.Pythia.PythiaSignatureHelpProvider.ctor(implementation): expected exactly 1 export matching constraints:
2026-07-31 09:17:09.364 [info] Contract name: Microsoft.CodeAnalysis.ExternalAccess.Pythia.Api.IPythiaSignatureHelpProviderImplementation
2026-07-31 09:17:09.365 [info] TypeIdentityName: Microsoft.CodeAnalysis.ExternalAccess.Pythia.Api.IPythiaSignatureHelpProviderImplementation
2026-07-31 09:17:09.365 [info] but found 0.
2026-07-31 09:17:09.365 [info] part definition Microsoft.CodeAnalysis.ExternalAccess.Pythia.PythiaSignatureHelpProvider
2026-07-31 09:17:09.365 [info]
2026-07-31 09:17:09.366 [info] Microsoft.VisualStudio.DesignTools.CodeAnalysis.Handlers.OnAutoInsertHandler.ctor(autoInsertService): expected exactly 1 export matching constraints:
2026-07-31 09:17:09.366 [info] Contract name: Microsoft.VisualStudio.DesignTools.CodeAnalysis.AutoInsert.IXamlAutoInsertService
2026-07-31 09:17:09.366 [info] TypeIdentityName: Microsoft.VisualStudio.DesignTools.CodeAnalysis.AutoInsert.IXamlAutoInsertService
2026-07-31 09:17:09.366 [info] but found 0.
2026-07-31 09:17:09.366 [info] part definition Microsoft.VisualStudio.DesignTools.CodeAnalysis.Handlers.OnAutoInsertHandler
2026-07-31 09:17:09.366 [info]
2026-07-31 09:17:09.367 [info]
2026-07-31 09:17:09.367 [info] Microsoft.VisualStudio.Composition.CompositionFailedException: Errors exist in the composition.
2026-07-31 09:17:09.367 [info] at Microsoft.VisualStudio.Composition.CompositionConfiguration.ThrowOnErrors()
2026-07-31 09:17:09.367 [info] at Microsoft.CodeAnalysis.Remote.ExportProviderBuilder.CheckForAndReportCompositionErrors(CompositionConfiguration configuration, ComposableCatalog catalog) in /_/src/Workspaces/Remote/Core/ExportProviderBuilder.cs:line 205
2026-07-31 09:17:11.608 [info] [Global] Language server initialized
2026-07-31 09:17:11.609 [info] [Global] Monitoring client process 27276 for exit
2026-07-31 09:17:12.495 [info] [initialized] [Microsoft.CodeAnalysis.LanguageServer.FileBasedPrograms.FileBasedProgramsEntryPointDiscovery] Finished discovery in 'e:\source\AthenaTest' in 44 milliseconds
2026-07-31 09:17:12.619 [info] [Razor.LanguageClient.Cohost.RazorCohostDynamicRegistrationService] Requesting 27 Razor cohost registrations.
2026-07-31 09:17:12.657 [info] [initialized] [Razor] Razor extension startup finished.
2026-07-31 09:17:15.939 [info] [WorkspaceProjectFactoryService] Project E:\source\AthenaTest\ServiceDefaults\ServiceDefaults.csproj loaded by C# Dev Kit
2026-07-31 09:17:15.962 [info] [WorkspaceProjectFactoryService] Project E:\source\AthenaTest\AthenaTest.Service\AthenaTest.Service.csproj loaded by C# Dev Kit
2026-07-31 09:17:15.963 [info] [WorkspaceProjectFactoryService] Project E:\source\AthenaTest\NextGen.Service\NextGen.Service.csproj loaded by C# Dev Kit
2026-07-31 09:17:15.964 [info] [WorkspaceProjectFactoryService] Project E:\source\AthenaTest\AthenaTest\AthenaTest.csproj loaded by C# Dev Kit
2026-07-31 09:17:15.965 [info] [WorkspaceProjectFactoryService] Project E:\source\AthenaTest\ModMed.Service\ModMed.Service.csproj loaded by C# Dev Kit
2026-07-31 09:17:15.966 [info] [WorkspaceProjectFactoryService] Project E:\source\AthenaTest\AppHost\AppHost.csproj loaded by C# Dev Kit
2026-07-31 09:17:47.257 [info] Locating .NET runtime version 10.0.5
2026-07-31 09:17:47.867 [info] Dotnet path: C:\Program Files\dotnet\dotnet.exe
2026-07-31 09:17:47.867 [info] Activating C# + C# Dev Kit...
2026-07-31 09:17:48.781 [info] info: Program[0]
2026-07-31 09:17:48.781 [info] Server information:
2026-07-31 09:17:48.782 [info] info: Program[0]
2026-07-31 09:17:48.782 [info] Assembly informational version: 5.10.0-1.26352.10+83ca1a6465bb861e28a51cdbb4b56074b69cb5eb
2026-07-31 09:17:48.782 [info] info: Program[0]
2026-07-31 09:17:48.782 [info] Executable path: c:\Users\jtsombakos\.vscode\extensions\ms-dotnettools.csharp-2.146.2-win32-x64\.roslyn\Microsoft.CodeAnalysis.LanguageServer.exe
2026-07-31 09:17:48.782 [info] info: Program[0]
2026-07-31 09:17:48.783 [info] Process ID: 36652
2026-07-31 09:17:49.881 [info] fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
2026-07-31 09:17:49.881 [info] Encountered exception in the MEF composition
2026-07-31 09:17:49.882 [info] Microsoft.VisualStudio.Composition.PartDiscoveryException: Failure while scanning type "Microsoft.VisualStudio.DesignTools.CodeAnalysis.AutoInsert.XamlAutoInsertLanguageService".
2026-07-31 09:17:49.882 [info] ---> System.TypeLoadException: Could not resolve type 'Microsoft.VisualStudio.DesignTools.CodeAnalysis.AutoInsert.__VsMefMetadataView_Microsoft_VisualStudio_DesignTools_CodeAnalysis_AutoInsert_IAutoInsertMetadata' in assembly 'Microsoft.VisualStudio.DesignTools.CodeAnalysis, Version=18.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.
2026-07-31 09:17:49.882 [info] at System.Reflection.TypeNameResolver.GetTypeFromDefaultAssemblies(String typeName, ReadOnlySpan`1 nestedTypeNames, TypeName parsedName)
2026-07-31 09:17:49.882 [info] at System.Reflection.TypeNameResolver.GetType(String escapedTypeName, ReadOnlySpan`1 nestedTypeNames, TypeName parsedName)
2026-07-31 09:17:49.883 [info] at System.Reflection.TypeNameResolver.GetSimpleType(TypeName typeName)
2026-07-31 09:17:49.883 [info] at System.Reflection.TypeNameResolver.Resolve(TypeName typeName)
2026-07-31 09:17:49.883 [info] at System.Reflection.TypeNameResolver.GetTypeHelper(ReadOnlySpan`1 typeName, RuntimeAssembly requestingAssembly, Boolean throwOnError, Boolean requireAssemblyQualifiedName, IntPtr unsafeAccessorMethod)
2026-07-31 09:17:49.884 [info] at System.Reflection.TypeNameResolver.GetTypeHelper(Char* pTypeName, RuntimeAssembly requestingAssembly, Boolean throwOnError, Boolean requireAssemblyQualifiedName, IntPtr unsafeAccessorMethod)
2026-07-31 09:17:49.884 [info] at System.Reflection.CustomAttribute.CreateCustomAttributeInstance(RuntimeModule module, RuntimeType type, IRuntimeMethodInfo ctor, IntPtr& blob, IntPtr blobEnd, Int32& namedArgs)
2026-07-31 09:17:49.884 [info] at System.Reflection.CustomAttribute.AddCustomAttributes(ListBuilder`1& attributes, RuntimeModule decoratedModule, Int32 decoratedMetadataToken, RuntimeType attributeFilterType, Boolean mustBeInheritable, ListBuilder`1 derivedAttributes)
2026-07-31 09:17:49.884 [info] at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeModule decoratedModule, Int32 decoratedMetadataToken, Int32 pcaCount, RuntimeType attributeFilterType)
2026-07-31 09:17:49.885 [info] at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeType type, RuntimeType caType, Boolean inherit)
2026-07-31 09:17:49.885 [info] at Microsoft.VisualStudio.Composition.AttributeServices.GetAttributes[T](ICustomAttributeProvider attributeProvider)
2026-07-31 09:17:49.885 [info] at Microsoft.VisualStudio.Composition.MetadataViewImplProxy.FindImplClassConstructor(Type metadataType)
2026-07-31 09:17:49.885 [info] at Microsoft.VisualStudio.Composition.ImportMetadataViewConstraint.GetRequiredMetadata(TypeRef metadataViewRef, Resolver resolver)
2026-07-31 09:17:49.885 [info] at Microsoft.VisualStudio.Composition.ImportMetadataViewConstraint.GetConstraint(TypeRef metadataTypeRef, Resolver resolver)
2026-07-31 09:17:49.885 [info] at Microsoft.VisualStudio.Composition.PartDiscovery.GetMetadataViewConstraints(Type receivingType, Boolean importMany)
2026-07-31 09:17:49.886 [info] at Microsoft.VisualStudio.Composition.AttributedPartDiscovery.TryCreateImportDefinition(Type importingType, ICustomAttributeProvider member, ImmutableHashSet`1 importConstraints, ImportDefinition& importDefinition)
2026-07-31 09:17:49.886 [info] at Microsoft.VisualStudio.Composition.AttributedPartDiscovery.CreateImport(ParameterInfo parameter, ImmutableHashSet`1 importConstraints)
2026-07-31 09:17:49.886 [info] at Microsoft.VisualStudio.Composition.AttributedPartDiscovery.CreatePart(Type partType, Boolean typeExplicitlyRequested)
2026-07-31 09:17:49.886 [info] at Microsoft.VisualStudio.Composition.PartDiscovery.CombinedPartDiscovery.CreatePart(Type partType, Boolean typeExplicitlyRequested)
2026-07-31 09:17:49.886 [info] at Microsoft.VisualStudio.Composition.PartDiscovery.<>c__DisplayClass32_0.b__0(Type type)
2026-07-31 09:17:49.886 [info] --- End of inner exception stack trace ---
2026-07-31 09:17:49.888 [info] fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
2026-07-31 09:17:49.888 [info] Encountered exception in the MEF composition
2026-07-31 09:17:49.888 [info] Microsoft.VisualStudio.Composition.PartDiscoveryException: ReflectionTypeLoadException while enumerating types in assembly "c:\Users\jtsombakos\.vscode\extensions\ms-dotnettools.csharp-2.146.2-win32-x64\.xamlTools\Microsoft.VisualStudio.DesignTools.CodeAnalysis.dll". Results will be incomplete.
2026-07-31 09:17:49.888 [info] ---> System.Reflection.ReflectionTypeLoadException: Unable to load one or more of the requested types.
2026-07-31 09:17:49.889 [info] Could not load file or assembly 'Microsoft.VisualStudio.Composition, Version=18.9.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The system cannot find the file specified.
2026-07-31 09:17:49.889 [info] at System.Reflection.RuntimeModule.GetDefinedTypes()
2026-07-31 09:17:49.889 [info] at System.Reflection.RuntimeModule.GetTypes()
2026-07-31 09:17:49.889 [info] at Microsoft.VisualStudio.Composition.PartDiscovery.<>c__DisplayClass33_0.b__0(Assembly a)
2026-07-31 09:17:49.889 [info] System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.VisualStudio.Composition, Version=18.9.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The system cannot find the file specified.
2026-07-31 09:17:49.890 [info] File name: 'Microsoft.VisualStudio.Composition, Version=18.9.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
2026-07-31 09:17:49.890 [info] --- End of inner exception stack trace ---
2026-07-31 09:17:49.890 [info] fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
2026-07-31 09:17:49.890 [info] Encountered errors in the MEF composition:
2026-07-31 09:17:49.890 [info] ----- CompositionError level 1 ------
2026-07-31 09:17:49.890 [info] Microsoft.CodeAnalysis.ExternalAccess.Copilot.Internal.SemanticSearch.CopilotSemanticSearchQueryExecutor.ctor(workspaceProvider): expected exactly 1 export matching constraints:
2026-07-31 09:17:49.891 [info] Contract name: Microsoft.CodeAnalysis.Host.IHostWorkspaceProvider
2026-07-31 09:17:49.891 [info] TypeIdentityName: Microsoft.CodeAnalysis.Host.IHostWorkspaceProvider
2026-07-31 09:17:49.891 [info] but found 0.
2026-07-31 09:17:49.891 [info] part definition Microsoft.CodeAnalysis.ExternalAccess.Copilot.Internal.SemanticSearch.CopilotSemanticSearchQueryExecutor
2026-07-31 09:17:49.891 [info]
2026-07-31 09:17:49.892 [info] Microsoft.CodeAnalysis.ExternalAccess.Copilot.Internal.CodeMapper.CSharpMapCodeService.ctor(service): expected exactly 1 export matching constraints:
2026-07-31 09:17:49.892 [info] Contract name: Microsoft.CodeAnalysis.ExternalAccess.Copilot.CodeMapper.ICSharpCopilotMapCodeService
2026-07-31 09:17:49.892 [info] TypeIdentityName: Microsoft.CodeAnalysis.ExternalAccess.Copilot.CodeMapper.ICSharpCopilotMapCodeService
2026-07-31 09:17:49.892 [info] but found 0.
2026-07-31 09:17:49.893 [info] part definition Microsoft.CodeAnalysis.ExternalAccess.Copilot.Internal.CodeMapper.CSharpMapCodeService
2026-07-31 09:17:49.893 [info]
2026-07-31 09:17:49.893 [info] Microsoft.VisualStudio.DesignTools.CodeAnalysis.Handlers.OnAutoInsertHandler.ctor(autoInsertService): expected exactly 1 export matching constraints:
2026-07-31 09:17:49.893 [info] Contract name: Microsoft.VisualStudio.DesignTools.CodeAnalysis.AutoInsert.IXamlAutoInsertService
2026-07-31 09:17:49.893 [info] TypeIdentityName: Microsoft.VisualStudio.DesignTools.CodeAnalysis.AutoInsert.IXamlAutoInsertService
2026-07-31 09:17:49.893 [info] but found 0.
2026-07-31 09:17:49.894 [info] part definition Microsoft.VisualStudio.DesignTools.CodeAnalysis.Handlers.OnAutoInsertHandler
2026-07-31 09:17:49.894 [info]
2026-07-31 09:17:49.894 [info] Microsoft.CodeAnalysis.ExternalAccess.Pythia.PythiaSignatureHelpProvider.ctor(implementation): expected exactly 1 export matching constraints:
2026-07-31 09:17:49.894 [info] Contract name: Microsoft.CodeAnalysis.ExternalAccess.Pythia.Api.IPythiaSignatureHelpProviderImplementation
2026-07-31 09:17:49.894 [info] TypeIdentityName: Microsoft.CodeAnalysis.ExternalAccess.Pythia.Api.IPythiaSignatureHelpProviderImplementation
2026-07-31 09:17:49.894 [info] but found 0.
2026-07-31 09:17:49.895 [info] part definition Microsoft.CodeAnalysis.ExternalAccess.Pythia.PythiaSignatureHelpProvider
2026-07-31 09:17:49.895 [info]
2026-07-31 09:17:49.895 [info]
2026-07-31 09:17:49.895 [info] Microsoft.VisualStudio.Composition.CompositionFailedException: Errors exist in the composition.
2026-07-31 09:17:49.895 [info] at Microsoft.VisualStudio.Composition.CompositionConfiguration.ThrowOnErrors()
2026-07-31 09:17:49.895 [info] at Microsoft.CodeAnalysis.Remote.ExportProviderBuilder.CheckForAndReportCompositionErrors(CompositionConfiguration configuration, ComposableCatalog catalog) in /_/src/Workspaces/Remote/Core/ExportProviderBuilder.cs:line 205
2026-07-31 09:17:51.525 [info] [Global] Language server initialized
2026-07-31 09:17:51.525 [info] [Global] Monitoring client process 17732 for exit
2026-07-31 09:17:52.326 [info] [initialized] [Microsoft.CodeAnalysis.LanguageServer.FileBasedPrograms.FileBasedProgramsEntryPointDiscovery] Finished discovery in 'e:\source\AthenaTest' in 15 milliseconds
2026-07-31 09:17:52.477 [info] [Razor.LanguageClient.Cohost.RazorCohostDynamicRegistrationService] Requesting 27 Razor cohost registrations.
2026-07-31 09:17:52.502 [info] [initialized] [Razor] Razor extension startup finished.
2026-07-31 09:17:57.866 [info] [WorkspaceProjectFactoryService] Project E:\source\AthenaTest\ServiceDefaults\ServiceDefaults.csproj loaded by C# Dev Kit
2026-07-31 09:17:57.892 [info] [WorkspaceProjectFactoryService] Project E:\source\AthenaTest\AthenaTest\AthenaTest.csproj loaded by C# Dev Kit
2026-07-31 09:17:57.894 [info] [WorkspaceProjectFactoryService] Project E:\source\AthenaTest\ModMed.Service\ModMed.Service.csproj loaded by C# Dev Kit
2026-07-31 09:17:57.895 [info] [WorkspaceProjectFactoryService] Project E:\source\AthenaTest\AppHost\AppHost.csproj loaded by C# Dev Kit
2026-07-31 09:17:57.896 [info] [WorkspaceProjectFactoryService] Project E:\source\AthenaTest\AthenaTest.Service\AthenaTest.Service.csproj loaded by C# Dev Kit
2026-07-31 09:17:57.898 [info] [WorkspaceProjectFactoryService] Project E:\source\AthenaTest\NextGen.Service\NextGen.Service.csproj loaded by C# Dev Kit

```

### C# LSP Trace Logs log ###

```

```

## Environment Information ##
**VSCode version**: 1.131.0
**C# Extension**: 2.146.2
**Using OmniSharp**: false

Dotnet Information
.NET SDK:
Version: 10.0.400-preview.0.26322.102
Commit: 0cf89a94a1
Workload version: 10.0.400-manifests.11c77abd
MSBuild version: 18.9.0-preview-26322-102+0cf89a94a

Runtime Environment:
OS Name: Windows
OS Version: 10.0.26200
OS Platform: Windows
RID: win-x64
Base Path: C:\Program Files\dotnet\sdk\10.0.400-preview.0.26322.102\

.NET workloads installed:
There are no installed workloads to display.
Configured to use workload sets when installing new manifests.
No workload sets are installed. Run "dotnet workload restore" to install a workload set.

Host:
Version: 10.0.10
Architecture: x64
Commit: f7d90799ce

.NET SDKs installed:
7.0.410 [C:\Program Files\dotnet\sdk]
8.0.423 [C:\Program Files\dotnet\sdk]
10.0.110 [C:\Program Files\dotnet\sdk]
10.0.204 [C:\Program Files\dotnet\sdk]
10.0.302 [C:\Program Files\dotnet\sdk]
10.0.400-preview.0.26322.102 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 7.0.20 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 8.0.28 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 8.0.29 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 9.0.17 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 10.0.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 10.0.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 10.0.10 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 7.0.20 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 8.0.28 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 8.0.29 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 9.0.17 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 10.0.8 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 10.0.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 10.0.10 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 7.0.20 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 8.0.28 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 8.0.29 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 9.0.17 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 10.0.8 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 10.0.9 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 10.0.10 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

Other architectures found:
x86 [C:\Program Files (x86)\dotnet]
registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\x86\InstallLocation]

Environment variables:
DOTNET_CLI_UI_LANGUAGE [en-US]

global.json file:
Not found

Learn more:
https://aka.ms/dotnet/info

Download .NET:
https://aka.ms/dotnet/download

Visual Studio Code Extensions

|Extension|Author|Version|Folder Name|
|---|---|---|---|
|aspire-vscode|microsoft-aspire|1.16.0|microsoft-aspire.aspire-vscode-1.16.0|
|azure-repos|ms-vscode|0.40.0|ms-vscode.azure-repos-0.40.0|
|base64|m4ns0ur|1.0.0|m4ns0ur.base64-1.0.0|
|csdevkit|ms-dotnettools|3.27.196|ms-dotnettools.csdevkit-3.27.196-win32-x64|
|csharp|ms-dotnettools|2.146.2|ms-dotnettools.csharp-2.146.2-win32-x64|
|hexeditor|ms-vscode|1.11.1|ms-vscode.hexeditor-1.11.1|
|hl7tools|RobHolme|2.0.7|robholme.hl7tools-2.0.7|
|material-icon-theme|PKief|5.37.0|pkief.material-icon-theme-5.37.0|
|native-preview|TypeScriptTeam|0.20260708.2|typescriptteam.native-preview-0.20260708.2-win32-x64|
|night-owl|sdras|2.1.1|sdras.night-owl-2.1.1|
|quicktype|quicktype|23.0.170|quicktype.quicktype-23.0.170|
|remote-repositories|ms-vscode|0.42.0|ms-vscode.remote-repositories-0.42.0|
|rest-client|humao|0.25.1|humao.rest-client-0.25.1|
|TabOut|albert|0.2.4|albert.tabout-0.2.4|
|vscode-azureappservice|ms-azuretools|0.27.0|ms-azuretools.vscode-azureappservice-0.27.0|
|vscode-azurefunctions|ms-azuretools|1.22.0|ms-azuretools.vscode-azurefunctions-1.22.0|
|vscode-azureresourcegroups|ms-azuretools|0.12.7|ms-azuretools.vscode-azureresourcegroups-0.12.7|
|vscode-dotnet-runtime|ms-dotnettools|3.1.0|ms-dotnettools.vscode-dotnet-runtime-3.1.0|
|vscode-icons|vscode-icons-team|12.19.0|vscode-icons-team.vscode-icons-12.19.0|
|xml|DotJoshJohnson|2.5.1|dotjoshjohnson.xml-2.5.1|;

C# Settings

|Setting|Value|
|---|---|
|preferCSharpExtension|false|
|compilerDiagnosticScope|openFiles|
|analyzerDiagnosticScope|openFiles|
|enableXamlTools|true|
|useServerGC|true|;

System Info

Item|Value
---|---
VS Code Version|Code 1.131.0 (e4c7e7b1d6d060162f4aa7f8225271b67ce1df75, 2026-07-28T10:51:25Z)
OS Version|Windows_NT x64 10.0.26200
CPUs|Intel(R) Core(TM) i5-8500 CPU @ 3.00GHz (6 x 3000)
GPU Status|2d_canvas: enabled
GPU0: VENDOR= 0x8086, DEVICE=0x3e92 [Intel(R) UHD Graphics 630], DRIVER_VENDOR=Intel, DRIVER_VERSION=30.0.101.1339 *ACTIVE*
GPU1: VENDOR= 0x1414, DEVICE=0x008c [Microsoft Basic Render Driver], DRIVER_VERSION=10.0.26100.8972
Machine model name:
Machine model version:
direct_rendering_display_compositor: disabled_off_ok
gpu_compositing: enabled
multiple_raster_threads: enabled_on
opengl: enabled_on
rasterization: enabled
raw_draw: disabled_off_ok
skia_graphite: disabled_off
trees_in_viz: disabled_off
video_decode: enabled
video_encode: enabled
webgl: enabled
webgpu: enabled
webnn: disabled_off
Load (avg)|
Memory (System)|31.78GB (9.49GB free)
Process Argv|--crash-reporter-id a079dcaa-039a-4dfb-8683-7ec01accca06
Screen Reader|no
VM|0%
User Agent|Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Code/1.131.0 Chrome/148.0.7778.280 Electron/42.7.0 Safari/537.36
Installation pure|true

A/B Experiments

```
vsliv368cf:30146710
vswsl492cf:30256860
binariesv615:30325510
nativeloc1:31344060
dwcopilot:31170013
dwoutputs:31242946
copilot_t_ci:31333650
e5gg6876:31282496
pythonrdcb7:31342333
6518g693:31463988
aj953862:31281341
envsactivate1:31551504
gh487529:31544284
cloudbuttont:31379625
3efgi100_wstrepl:31403338
55ia6109:31457054
ec5jj548:31422691
cp_cls_t_966_ss:31526232
4je02754:31466945
8hhj4413:31478653
cp_cls_t_1081:31454832
conptydll_true:31498968
e9c30283:31461165
test_treatment2:31471001
46204921:31447328
capico_a_098a3278:31555650
idci7584:31464702
e3e4d672:31494082
ei9d7968:31496641
chat:31457767
8hig5102:31480529
89g7j272:31518289
7e187181:31503455
i2gc6536:31499202
52612955:31516516
ghj88844:31499326
ddid_c:31478207
hmra_i5g22:31518061
7df3h592:31512476
cp_cls_t_1082:31535311
logging_enabled_new:31498466
j0d79568:31499440
jb_cp_cls_t_632:31543129
56dj4588:31512888
32d76977:31512328
ha629193:31508444
cdk-lw-on:31524445
f9bf7985:31543584
jh5f2457_c:31540921
41836166:31537719
jbcp_cls_pctr_t:31531130
61138546:31518536
cp_intellij_t_nes:31548657
gf14b233:31526830
nes-curr-leftover-1500:31538366
ahp-both-windows:31556933
h561g132:31533256
session_8:31532895
ihg5j128:31534457
f412h606:31551416
7g2b5551:31542111
nes-ex-cf-euporie-03:31542868
5fe6f778:31554331
allow-none:31555437
fd5dc207:31551400
c7c27ce7:31554789
nes-gb2-ctrl:31554343
8hc4g144:31558143
1532g621_copy:31554320
treatment-23-1:31555779
unuse_dynamic_mcp:31555281
session-mark-done:31558131
```

### Attachments


.

Start by launching VS Code 1.131.0 with the C# extension active and inspect the C# output for the MEF composition errors. Review the reported Microsoft.VisualStudio.DesignTools.CodeAnalysis.dll and missing Microsoft.VisualStudio.Composition 18.9.0.0 assembly, along with the extension logs. Done means C# startup produces no composition errors.

Written by the indexing model from the issue text.