Assembly conflict when trying to type something in Razor file

[pontakornth]

Type: Bug

Issue Description

When I try to type something in .cshtml file, there will be a random error. After I look into the log, I see assembly conflict.

The issue appears on both release and pre-release version of C# Dev Kit.

Steps to Reproduce

1. Open VSCode
2. Open an ASP.NET Core project with Razor Page
3. Open a .cshtml file
4. Type @Html. should make the error appear.

Expected Behavior

Auto complete appears if available. No effect on other files

Actual Behavior

Auto complete appears and then disappears. After that, autocomplete and some syntax highlighting in C# files do not work.

C# Logs

[stdout] fail: Microsoft.CodeAnalysis.LanguageServer.ExportProviderBuilder[0]
      /Users/pontakorn/.vscode/extensions/ms-dotnettools.csharp-2.39.29-darwin-x64/.xamlTools/Microsoft.VisualStudio.DesignTools.CodeAnalysis.dll with assembly name Microsoft.VisualStudio.DesignTools.CodeAnalysis, Version=17.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a conflicts with extension loaded from /Users/pontakorn/.vscode/extensions/ms-dotnettools.csharp-2.39.29-darwin-x64/.xamlTools
[stdout] fail: Microsoft.CodeAnalysis.LanguageServer.ExportProviderBuilder[0]
      /Users/pontakorn/.vscode/extensions/ms-dotnettools.csharp-2.39.29-darwin-x64/.xamlTools/Microsoft.VisualStudio.DesignTools.CodeAnalysis.Diagnostics.dll with assembly name Microsoft.VisualStudio.DesignTools.CodeAnalysis.Diagnostics, Version=17.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a conflicts with extension loaded from /Users/pontakorn/.vscode/extensions/ms-dotnettools.csharp-2.39.29-darwin-x64/.xamlTools
[stdout] {"pipeName":"/var/folders/3t/14q5n69j3vv0n0nym4l1dnpr0000gn/T/b44cc963.sock"}

Environment information

VSCode version: 1.92.2
C# Extension: 2.39.29
Using OmniSharp: false

Dotnet Information

.NET SDK: Version: 8.0.303 Commit: 29ab8e3268 Workload version: 8.0.300-manifests.e4379c3d MSBuild version: 17.10.4+10fbfbf2e

Runtime Environment:
OS Name: Mac OS X
OS Version: 14.5
OS Platform: Darwin
RID: osx-x64
Base Path: /usr/local/share/dotnet/sdk/8.0.303/

.NET workloads installed:
[aspire]
Installation Source: SDK 8.0.300
Manifest Version: 8.1.0/8.0.100
Manifest Path: /usr/local/share/dotnet/sdk-manifests/8.0.100/microsoft.net.sdk.aspire/8.1.0/WorkloadManifest.json
Install Type: FileBased

Host:
Version: 8.0.7
Architecture: x64
Commit: 2aade6beb0

.NET SDKs installed:
8.0.303 [/usr/local/share/dotnet/sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 8.0.7 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 8.0.7 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]

Other architectures found:
None

Environment variables:
Not set

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
astro-vscode	astro-build	2.14.1	astro-build.astro-vscode-2.14.1-darwin-x64
atelier-vscode-themes	Atelierbram	0.0.13	atelierbram.atelier-vscode-themes-0.0.13
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ayu	teabyii	1.0.5	teabyii.ayu-1.0.5
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brackets-light-pro	fehey	0.4.6	fehey.brackets-light-pro-0.4.6
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bun	Pandy	0.0.4	pandy.bun-0.0.4
catppuccin-vsc	Catppuccin	3.15.2	catppuccin.catppuccin-vsc-3.15.2
codeium	Codeium	1.12.6	codeium.codeium-1.12.6
codesandbox-projects	CodeSandbox-io	0.2.137	codesandbox-io.codesandbox-projects-0.2.137
csdevkit	ms-dotnettools	1.10.10	ms-dotnettools.csdevkit-1.10.10-darwin-x64
csharp	ms-dotnettools	2.39.29	ms-dotnettools.csharp-2.39.29-darwin-x64
dbclient-jdbc	cweijan	1.3.5	cweijan.dbclient-jdbc-1.3.5
debugpy	ms-python	2024.10.0	ms-python.debugpy-2024.10.0-darwin-x64
doki-theme	unthrottled	88.1.17	unthrottled.doki-theme-88.1.17
dotenv	mikestead	1.0.1	mikestead.dotenv-1.0.1
elixir-ls	JakeBecker	0.23.1	jakebecker.elixir-ls-0.23.1
even-better-toml	tamasfe	0.19.2	tamasfe.even-better-toml-0.19.2
explorer	vitest	1.2.0	vitest.explorer-1.2.0
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github-vscode-theme	GitHub	6.3.4	github.github-vscode-theme-6.3.4
gitlens	eamodio	15.3.1	eamodio.gitlens-15.3.1
go	golang	0.42.0	golang.go-0.42.0
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i18n-ally	lokalise	2.12.0	lokalise.i18n-ally-2.12.0
iconify	antfu	0.9.2	antfu.iconify-0.9.2
indent-rainbow	oderwat	8.3.1	oderwat.indent-rainbow-8.3.1
isort	ms-python	2023.10.1	ms-python.isort-2023.10.1
jupyter	ms-toolsai	2024.7.0	ms-toolsai.jupyter-2024.7.0-darwin-x64
jupyter-keymap	ms-toolsai	1.1.2	ms-toolsai.jupyter-keymap-1.1.2
jupyter-renderers	ms-toolsai	1.0.19	ms-toolsai.jupyter-renderers-1.0.19
language-stylus	sysoev	1.16.0	sysoev.language-stylus-1.16.0
Lisp	mattn	0.1.12	mattn.lisp-0.1.12
LiveServer	ritwickdey	5.7.9	ritwickdey.liveserver-5.7.9
lunar	bereketsemagn	1.4.0	bereketsemagn.lunar-1.4.0
makefile-tools	ms-vscode	0.10.26	ms-vscode.makefile-tools-0.10.26
markdown-preview-enhanced	shd101wyy	0.8.13	shd101wyy.markdown-preview-enhanced-0.8.13
material-icon-theme	PKief	5.9.0	pkief.material-icon-theme-5.9.0
material-theme	zhuangtongfa	3.17.2	zhuangtongfa.material-theme-3.17.2
nord-visual-studio-code	arcticicestudio	0.19.0	arcticicestudio.nord-visual-studio-code-0.19.0
phoenix	phoenixframework	0.1.2	phoenixframework.phoenix-0.1.2
postcss	csstools	1.0.9	csstools.postcss-1.0.9
prettier-vscode	esbenp	11.0.0	esbenp.prettier-vscode-11.0.0
pretty-ts-errors	YoavBls	0.6.0	yoavbls.pretty-ts-errors-0.6.0
prisma	Prisma	5.18.0	prisma.prisma-5.18.0
pymakr	Pycom	2.22.5	pycom.pymakr-2.22.5
python	ms-python	2024.12.3	ms-python.python-2024.12.3-darwin-x64
react-native-react-redux	EQuimper	2.0.6	equimper.react-native-react-redux-2.0.6
remote-containers	ms-vscode-remote	0.380.0	ms-vscode-remote.remote-containers-0.380.0
remote-ssh	ms-vscode-remote	0.113.1	ms-vscode-remote.remote-ssh-0.113.1
remote-ssh-edit	ms-vscode-remote	0.86.0	ms-vscode-remote.remote-ssh-edit-0.86.0
remote-wsl	ms-vscode-remote	0.88.2	ms-vscode-remote.remote-wsl-0.88.2
rest-client	humao	0.25.1	humao.rest-client-0.25.1
ruby-lsp	Shopify	0.7.16	shopify.ruby-lsp-0.7.16
rust-analyzer	rust-lang	0.3.2078	rust-lang.rust-analyzer-0.3.2078-darwin-x64
slidev	antfu	0.49.28	antfu.slidev-0.49.28
solargraph	castwide	0.24.1	castwide.solargraph-0.24.1
svelte-vscode	svelte	108.6.1	svelte.svelte-vscode-108.6.1
sync-scroll	dqisme	1.3.1	dqisme.sync-scroll-1.3.1
tailwindcss-intellisense-twin	lightyen	3.0.0	lightyen.tailwindcss-intellisense-twin-3.0.0
tauri-vscode	tauri-apps	0.2.6	tauri-apps.tauri-vscode-0.2.6
templ	a-h	0.0.26	a-h.templ-0.0.26
terraform	hashicorp	2.32.2	hashicorp.terraform-2.32.2-darwin-x64
todo-tree	Gruntfuggly	0.0.226	gruntfuggly.todo-tree-0.0.226
tokyo-night	enkia	1.0.9	enkia.tokyo-night-1.0.9
twind-intellisense	sastan	0.2.1	sastan.twind-intellisense-0.2.1
unocss	antfu	0.62.3	antfu.unocss-0.62.3
vite	antfu	0.2.5	antfu.vite-0.2.5
vsc-material-theme	Equinusocio	34.5.2	equinusocio.vsc-material-theme-34.5.2
vsc-material-theme-icons	equinusocio	3.8.7	equinusocio.vsc-material-theme-icons-3.8.7
vscode-database-client2	cweijan	7.5.9	cweijan.vscode-database-client2-7.5.9
vscode-deno	denoland	3.38.2	denoland.vscode-deno-3.38.2
vscode-docker	ms-azuretools	1.29.2	ms-azuretools.vscode-docker-1.29.2
vscode-dotnet-runtime	ms-dotnettools	2.1.5	ms-dotnettools.vscode-dotnet-runtime-2.1.5
vscode-eslint	dbaeumer	3.0.10	dbaeumer.vscode-eslint-3.0.10
vscode-github-actions	github	0.26.3	github.vscode-github-actions-0.26.3
vscode-graphql	GraphQL	0.12.0	graphql.vscode-graphql-0.12.0
vscode-graphql-syntax	GraphQL	1.3.6	graphql.vscode-graphql-syntax-1.3.6
vscode-icons	vscode-icons-team	12.8.0	vscode-icons-team.vscode-icons-12.8.0
vscode-import-cost	wix	3.3.0	wix.vscode-import-cost-3.3.0
vscode-jupyter-cell-tags	ms-toolsai	0.1.9	ms-toolsai.vscode-jupyter-cell-tags-0.1.9
vscode-jupyter-slideshow	ms-toolsai	0.1.6	ms-toolsai.vscode-jupyter-slideshow-0.1.6
vscode-mdx	unifiedjs	1.8.10	unifiedjs.vscode-mdx-1.8.10
vscode-pull-request-github	GitHub	0.94.0	github.vscode-pull-request-github-0.94.0
vscode-pylance	ms-python	2024.8.1	ms-python.vscode-pylance-2024.8.1
vscode-react-native	msjsdiag	1.13.0	msjsdiag.vscode-react-native-1.13.0
vscode-remote-extensionpack	ms-vscode-remote	0.25.0	ms-vscode-remote.vscode-remote-extensionpack-0.25.0
vscode-tailwindcss	bradlc	0.12.7	bradlc.vscode-tailwindcss-0.12.7
vscode-theme-onelight	akamud	2.3.0	akamud.vscode-theme-onelight-2.3.0
vscode-zig	ziglang	0.5.8	ziglang.vscode-zig-0.5.8
vsfire	toba	1.4.1	toba.vsfire-1.4.1
vsliveshare	ms-vsliveshare	1.0.5936	ms-vsliveshare.vsliveshare-1.0.5936
windicss-intellisense	voorjaar	0.21.6	voorjaar.windicss-intellisense-0.21.6

Extension version: 2.39.29
VS Code version: Code 1.92.2 (Universal) (fee1edb8d6d72a0ddff41e5f71a671c23ed924b9, 2024-08-14T17:29:30.058Z)
OS version: Darwin x64 23.5.0
Modes:

System Info

Item	Value
CPUs	Intel(R) Core(TM) i5-1038NG7 CPU @ 2.00GHz (8 x 2000)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: disabled_off 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 video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off
Load (avg)	3, 6, 7
Memory (System)	16.00GB (0.03GB free)
Process Argv	./RazorPolls --crash-reporter-id e5140bbd-435c-4ece-b729-e04d5e66dfaf
Screen Reader	no
VM	0%

A/B Experiments

vsliv368:30146709
vspor879:30202332
vspor708:30202333
vspor363:30204092
vscod805:30301674
binariesv615:30325510
vsaa593:30376534
py29gd2263:31024239
c4g48928:30535728
azure-dev_surveyone:30548225
vscrp:30673768
962ge761:30959799
pythongtdpath:30769146
welcomedialog:30910333
pythonnoceb:30805159
asynctok:30898717
pythonregdiag2:30936856
pythonmypyd1:30879173
h48ei257:31000450
pythontbext0:30879054
accentitlementst:30995554
dsvsc016:30899300
dsvsc017:30899301
dsvsc018:30899302
cppperfnew:31000557
dsvsc020:30976470
pythonait:31006305
dsvsc021:30996838
724cj586:31013169
pythoncenvpt:31062603
a69g1124:31058053
dvdeprecation:31068756
dwnewjupyter:31046869
impr_priority:31102340
refactort:31108082
pythonrstrctxt:31112756
wkspc-onlycs-c:31111717
pme_test_t:31118333
fje88620:31121564

[JoeRobich]

I was able to reproduce this locally with version 2.39.29

Logging from the end of the completion request

[LanguageServerHost] [06:17:41.069][End]textDocument/completion
[Error - 11:17:41 PM] [LanguageServerHost] System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.CodeAnalysis.LanguageServer.RoslynLanguageServer.GetLanguageForRequest(String methodName, Object serializedParameters) in /_/src/LanguageServer/Protocol/RoslynLanguageServer.cs:line 211
   at Microsoft.CommonLanguageServerProtocol.Framework.RequestExecutionQueue`1.ProcessQueueAsync() in /_/src/LanguageServer/Microsoft.CommonLanguageServerProtocol.Framework/RequestExecutionQueue.cs:line 248
[LanguageServerHost] Error processing queue, shutting down
[Info  - 11:17:41 PM] Error processing queue, shutting down
[Info  - 11:17:41 PM] Connection to server got closed. Server will restart.
true
Using dotnet configured on PATH
Dotnet path: /usr/local/share/dotnet/dotnet
Activating C# + C# Dev Kit + C# IntelliCode...
Starting server at /Users/joeyrobichaud/.vscode/extensions/ms-dotnettools.csharp-2.39.29-darwin-arm64/.roslyn/Microsoft.CodeAnalysis.LanguageServer.dll
Server arguments /Users/joeyrobichaud/.vscode/extensions/ms-dotnettools.csharp-2.39.29-darwin-arm64/.roslyn/Microsoft.CodeAnalysis.LanguageServer.dll --logLevel Trace --razorSourceGenerator /Users/joeyrobichaud/.vscode/extensions/ms-dotnettools.csharp-2.39.29-darwin-arm64/.razor/Microsoft.CodeAnalysis.Razor.Compiler.dll --razorDesignTimePath /Users/joeyrobichaud/.vscode/extensions/ms-dotnettools.csharp-2.39.29-darwin-arm64/.razor/Targets/Microsoft.NET.Sdk.Razor.DesignTime.targets --starredCompletionComponentPath /Users/joeyrobichaud/.vscode/extensions/ms-dotnettools.vscodeintellicode-csharp-2.1.11-darwin-arm64/components/starred-suggestions/platforms/darwin-arm64/node_modules/@vsintellicode/starred-suggestions-csharp.darwin-arm64 --devKitDependencyPath /Users/joeyrobichaud/.vscode/extensions/ms-dotnettools.csharp-2.39.29-darwin-arm64/.roslynDevKit/Microsoft.VisualStudio.LanguageServices.DevKit.dll --sessionId 9c4c2191-04a8-466f-8567-a23ea9b289df1724739434320 --extension /Users/joeyrobichaud/.vscode/extensions/ms-dotnettools.csharp-2.39.29-darwin-arm64/.xamlTools/Microsoft.VisualStudio.DesignTools.CodeAnalysis.dll --extension /Users/joeyrobichaud/.vscode/extensions/ms-dotnettools.csharp-2.39.29-darwin-arm64/.xamlTools/Microsoft.VisualStudio.DesignTools.CodeAnalysis.Diagnostics.dll --extension /Users/joeyrobichaud/.vscode/extensions/ms-dotnettools.csharp-2.39.29-darwin-arm64/.xamlTools/Microsoft.VisualStudio.DesignTools.CodeAnalysis.dll --extension /Users/joeyrobichaud/.vscode/extensions/ms-dotnettools.csharp-2.39.29-darwin-arm64/.xamlTools/Microsoft.VisualStudio.DesignTools.CodeAnalysis.Diagnostics.dll --telemetryLevel all --extensionLogDirectory /Users/joeyrobichaud/Library/Application Support/Code/logs/20240821T223520/window8/exthost/ms-dotnettools.csharp
waiting for named pipe information from server...
[stdout] trce: Program[0]
      Server started with process ID 26450
trce: Program[0]
      .NET Runtime Version: .NET 8.0.7
[stdout] trce: Microsoft.CodeAnalysis.LanguageServer.ExportProviderBuilder[0]
      Creating /Users/joeyrobichaud/.vscode/extensions/ms-dotnettools.vscodeintellicode-csharp-2.1.11-darwin-arm64/components/starred-suggestions/platforms/darwin-arm64/node_modules/@vsintellicode/starred-suggestions-csharp.darwin-arm64 load context for /Users/joeyrobichaud/.vscode/extensions/ms-dotnettools.vscodeintellicode-csharp-2.1.11-darwin-arm64/components/starred-suggestions/platforms/darwin-arm64/node_modules/@vsintellicode/starred-suggestions-csharp.darwin-arm64/Microsoft.VisualStudio.IntelliCode.CSharp.dll
[stdout] trce: Microsoft.CodeAnalysis.LanguageServer.ExportProviderBuilder[0]
      Creating /Users/joeyrobichaud/.vscode/extensions/ms-dotnettools.csharp-2.39.29-darwin-arm64/.xamlTools load context for /Users/joeyrobichaud/.vscode/extensions/ms-dotnettools.csharp-2.39.29-darwin-arm64/.xamlTools/Microsoft.VisualStudio.DesignTools.CodeAnalysis.dll
[stdout] fail: Microsoft.CodeAnalysis.LanguageServer.ExportProviderBuilder[0]
      /Users/joeyrobichaud/.vscode/extensions/ms-dotnettools.csharp-2.39.29-darwin-arm64/.xamlTools/Microsoft.VisualStudio.DesignTools.CodeAnalysis.dll with assembly name Microsoft.VisualStudio.DesignTools.CodeAnalysis, Version=17.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a conflicts with extension loaded from /Users/joeyrobichaud/.vscode/extensions/ms-dotnettools.csharp-2.39.29-darwin-arm64/.xamlTools
[stdout] fail: Microsoft.CodeAnalysis.LanguageServer.ExportProviderBuilder[0]
      /Users/joeyrobichaud/.vscode/extensions/ms-dotnettools.csharp-2.39.29-darwin-arm64/.xamlTools/Microsoft.VisualStudio.DesignTools.CodeAnalysis.Diagnostics.dll with assembly name Microsoft.VisualStudio.DesignTools.CodeAnalysis.Diagnostics, Version=17.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a conflicts with extension loaded from /Users/joeyrobichaud/.vscode/extensions/ms-dotnettools.csharp-2.39.29-darwin-arm64/.xamlTools
[stdout] trce: Microsoft.CodeAnalysis.LanguageServer.ExportProviderBuilder[0]
      Composing MEF catalog using:

The exception thrown after Completion causes the Language Server to restart which is where we encounter the conflicts trying to reload certain assemblies.

Closing as I cannot reproduce this issue with prerelease version 2.41.26 or later of the C# extension.

[LanguageServerHost] [06:23:09.114][End]textDocument/completion
[LanguageServerHost] Using C# from request text document
[ExtensionTypeRefResolver] Resolving type, Roslyn.LanguageServer.Protocol.InlayHintParams
[MEF Assembly Loader] Loading assembly Microsoft.CodeAnalysis.LanguageServer.Protocol, Version=4.12.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
[ExtensionTypeRefResolver] Resolving type, Roslyn.LanguageServer.Protocol.InlayHint[]
[MEF Assembly Loader] Loading assembly Microsoft.CodeAnalysis.LanguageServer.Protocol, Version=4.12.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
[ExtensionTypeRefResolver] Resolving type, Microsoft.CodeAnalysis.LanguageServer.Handler.InlayHint.InlayHintHandler
[MEF Assembly Loader] Loading assembly Microsoft.CodeAnalysis.LanguageServer.Protocol, Version=4.12.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
[LanguageServerHost] virtualcsharp-razor:///Users/joeyrobichaud/Source/TestRazor3/Pages/Index.cshtml__virtual.cs found in workspace Host

@pontakornth Please try switching to the pre-release version until we ship a new release build.