Bug Report: Unexpected Behavior in [Feature]

[lukaferro]

Type: Bug

Issue Description

Steps to Reproduce

Expected Behavior

Actual Behavior

Extension version: 2.130.5
VS Code version: Code 1.113.0 (cfbea10c5ffb233ea9177d34726e6056e89913dc, 2026-03-24T15:07:18+01:00)
OS version: Windows_NT x64 10.0.26200
Modes:

Logs

C# log

Details

2026-04-01 13:07:35.002 [info] Locating .NET runtime version 10.0.5
2026-04-01 13:07:43.418 [info] Dotnet path: c:\Users\LucaFerro\AppData\Roaming\Code\User\globalStorage\ms-dotnettools.vscode-dotnet-runtime\.dotnet\10.0.5~x64~aspnetcore\dotnet.exe
2026-04-01 13:07:43.418 [info] Activating C# + C# Dev Kit...
2026-04-01 13:07:49.130 [info] info: Program[0]
2026-04-01 13:07:49.130 [info]       Server started with process ID 11928
2026-04-01 13:08:19.052 [info] [Program] Language server initialized
2026-04-01 13:08:19.063 [info] [Program] Monitoring client process 8880 for exit
2026-04-01 13:08:25.622 [info] [serviceBroker/connect] [WorkspaceProjectFactoryService] Project C:\projects\FMGroup.Mail\EmailSender\FMGroup.Mail.csproj loaded by C# Dev Kit
2026-04-01 13:08:26.316 [info] [serviceBroker/connect] [WorkspaceProjectFactoryService] Project C:\projects\EasyWebParts_Blazor\EasyWebParts_Blazor\EasyWebParts_Blazor.csproj loaded by C# Dev Kit
2026-04-01 13:08:26.451 [info] [serviceBroker/connect] [WorkspaceProjectFactoryService] Project C:\projects\EasyWebParts_Blazor\EasyWebParts.Infrastructure\EasyWebParts.Infrastructure.csproj loaded by C# Dev Kit
2026-04-01 14:53:28.924 [info] [textDocument/diagnostic] [Microsoft.CodeAnalysis.MSBuild.BuildHostProcessManager] .NET BuildHost started from c:\Users\LucaFerro\.vscode\extensions\ms-dotnettools.csharp-2.130.5-win32-x64\.roslyn\Microsoft.CodeAnalysis.LanguageServer.exe reloading to start from C:\Program Files\dotnet\dotnet.exe to match necessary SDK location.
2026-04-01 14:53:30.513 [warning] [textDocument/diagnostic] [LanguageServerProjectLoader] Il progetto C:\Users\LucaFerro\AppData\Local\Temp\roslyn-canonical-misc\60e33662-622e-4993-9c55-615d99006e62\Canonical.csproj ha dipendenze non risolte
2026-04-01 14:53:30.823 [info] [textDocument/diagnostic] [LanguageServerProjectLoader] Il caricamento di C:\Users\LucaFerro\AppData\Local\Temp\roslyn-canonical-misc\60e33662-622e-4993-9c55-615d99006e62\Canonical.cs è stato completato
2026-04-01 14:53:30.831 [info] [textDocument/diagnostic] [LanguageServerProjectLoader] Ripristino di Canonical.cs: Esecuzione di dotnet restore su C:\Users\LucaFerro\AppData\Local\Temp\roslyn-canonical-misc\60e33662-622e-4993-9c55-615d99006e62\Canonical.cs
2026-04-01 14:53:30.832 [info] [textDocument/diagnostic] [Microsoft.CodeAnalysis.LanguageServer.DotnetCliHelper] Using dotnet executable configured on the PATH
2026-04-01 14:53:31.800 [info] [textDocument/diagnostic] [LanguageServerProjectLoader] Ripristino di Canonical.cs:   Determining projects to restore...
2026-04-01 14:53:32.777 [info] [textDocument/diagnostic] [LanguageServerProjectLoader] Ripristino di Canonical.cs:   Restored C:\Users\LucaFerro\AppData\Local\Temp\roslyn-canonical-misc\60e33662-622e-4993-9c55-615d99006e62\Canonical.csproj (in 622 ms).
2026-04-01 14:53:32.829 [info] [textDocument/diagnostic] [LanguageServerProjectLoader] Ripristino completato
2026-04-01 14:53:32.829 [info] [textDocument/diagnostic] [LanguageServerProjectLoader] Completato il (ri)caricamento di tutti i progetti in 00:00:04.4576360
2026-04-01 15:03:54.773 [error] Request textDocument/documentSymbol failed.
  Message: Project does not contain any Razor documents. (Parameter 'project')
  Code: -32000 
[object Object]
2026-04-01 15:03:54.776 [error] Request textDocument/codeAction failed.
  Message: Project does not contain any Razor documents. (Parameter 'project')
  Code: -32000 
[object Object]
2026-04-01 15:03:55.002 [error] Request textDocument/inlayHint failed.
  Message: Project does not contain any Razor documents. (Parameter 'project')
  Code: -32000 
[object Object]
2026-04-01 15:03:55.004 [error] Request textDocument/inlayHint failed.
  Message: Project does not contain any Razor documents. (Parameter 'project')
  Code: -32000 
[object Object]
2026-04-01 15:03:55.067 [error] Request textDocument/semanticTokens/range failed.
  Message: Project does not contain any Razor documents. (Parameter 'project')
  Code: -32000 
[object Object]
2026-04-01 15:03:55.069 [error] Request textDocument/semanticTokens/range failed.
  Message: Project does not contain any Razor documents. (Parameter 'project')
  Code: -32000 
[object Object]
2026-04-01 15:03:55.071 [error] Request textDocument/semanticTokens/range failed.
  Message: Project does not contain any Razor documents. (Parameter 'project')
  Code: -32000 
[object Object]
2026-04-01 15:03:55.073 [error] Request textDocument/semanticTokens/range failed.
  Message: Project does not contain any Razor documents. (Parameter 'project')
  Code: -32000 
[object Object]
2026-04-01 15:03:55.364 [error] Request textDocument/codeLens failed.
  Message: Project does not contain any Razor documents. (Parameter 'project')
  Code: -32000 
[object Object]
2026-04-01 15:03:55.383 [error] Request textDocument/codeLens failed.
  Message: Project does not contain any Razor documents. (Parameter 'project')
  Code: -32000 
[object Object]
2026-04-01 15:03:56.131 [error] Request textDocument/hover failed.
  Message: Project does not contain any Razor documents. (Parameter 'project')
  Code: -32000 
[object Object]
2026-04-01 15:03:56.387 [error] Request textDocument/hover failed.
  Message: Project does not contain any Razor documents. (Parameter 'project')
  Code: -32000 
[object Object]
2026-04-01 15:03:56.914 [error] Request textDocument/semanticTokens/range failed.
  Message: Project does not contain any Razor documents. (Parameter 'project')
  Code: -32000 
[object Object]
2026-04-01 15:03:56.916 [error] Request textDocument/semanticTokens/range failed.
  Message: Project does not contain any Razor documents. (Parameter 'project')
  Code: -32000 
[object Object]
2026-04-01 15:03:56.919 [error] Request textDocument/semanticTokens/range failed.
  Message: Project does not contain any Razor documents. (Parameter 'project')
  Code: -32000 
[object Object]
2026-04-01 15:03:56.920 [error] Request textDocument/semanticTokens/range failed.
  Message: Project does not contain any Razor documents. (Parameter 'project')
  Code: -32000 
[object Object]
2026-04-01 15:03:56.994 [error] Request textDocument/codeLens failed.
  Message: Project does not contain any Razor documents. (Parameter 'project')
  Code: -32000 
[object Object]
2026-04-01 15:03:56.994 [error] Request textDocument/codeLens failed.
  Message: Project does not contain any Razor documents. (Parameter 'project')
  Code: -32000 
[object Object]
2026-04-01 15:03:57.204 [error] Request textDocument/hover failed.
  Message: Project does not contain any Razor documents. (Parameter 'project')
  Code: -32000 
[object Object]
2026-04-01 15:03:57.492 [error] Request textDocument/hover failed.
  Message: Project does not contain any Razor documents. (Parameter 'project')
  Code: -32000 
[object Object]
2026-04-01 15:03:58.019 [error] Request textDocument/hover failed.
  Message: Project does not contain any Razor documents. (Parameter 'project')
  Code: -32000 
[object Object]
2026-04-01 15:04:00.665 [error] Request textDocument/hover failed.
  Message: Project does not contain any Razor documents. (Parameter 'project')
  Code: -32000 
[object Object]

C# LSP Trace Logs log

Details

Environment Information

VSCode version: 1.113.0
C# Extension: 2.130.5
Using OmniSharp: false

Dotnet Information

Host:
Version: 10.0.5
Architecture: x64
Commit: a612c2a105
RID: win-x64

.NET SDKs installed:
No SDKs were found.

.NET runtimes installed:
Microsoft.AspNetCore.App 10.0.5 [c:\Users\LucaFerro\AppData\Roaming\Code\User\globalStorage\ms-dotnettools.vscode-dotnet-runtime.dotnet\10.0.5x64aspnetcore\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 10.0.5 [c:\Users\LucaFerro\AppData\Roaming\Code\User\globalStorage\ms-dotnettools.vscode-dotnet-runtime.dotnet\10.0.5x64aspnetcore\shared\Microsoft.NETCore.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]
DOTNET_NOLOGO [true]

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
azure-repos	ms-vscode	0.40.0	ms-vscode.azure-repos-0.40.0
better-comments	aaron-bond	3.0.2	aaron-bond.better-comments-3.0.2
bracket-pair-color-dlw	BracketPairColorDLW	0.0.6	bracketpaircolordlw.bracket-pair-color-dlw-0.0.6
catppuccin-vsc-icons	Catppuccin	1.26.0	catppuccin.catppuccin-vsc-icons-1.26.0
claude-dev	saoudrizwan	3.76.0	saoudrizwan.claude-dev-3.76.0
composer-php-vscode	DEVSENSE	1.69.18673	devsense.composer-php-vscode-1.69.18673
copilot-chat	GitHub	0.42.2	github.copilot-chat-0.42.2
csdevkit	ms-dotnettools	3.10.7	ms-dotnettools.csdevkit-3.10.7-win32-x64
csharp	ms-dotnettools	2.130.5	ms-dotnettools.csharp-2.130.5-win32-x64
data-workspace-vscode	ms-mssql	0.6.3	ms-mssql.data-workspace-vscode-0.6.3
debugpy	ms-python	2025.18.0	ms-python.debugpy-2025.18.0-win32-x64
es7-react-js-snippets	dsznajder	4.4.3	dsznajder.es7-react-js-snippets-4.4.3
figma-vscode-extension	figma	0.4.4	figma.figma-vscode-extension-0.4.4
geminicodeassist	google	2.75.0	google.geminicodeassist-2.75.0
html-css-class-completion	Zignd	1.20.0	zignd.html-css-class-completion-1.20.0
html5-boilerplate	sidthesloth	1.1.1	sidthesloth.html5-boilerplate-1.1.1
htmlplay	bianxianyang	0.0.10	bianxianyang.htmlplay-0.0.10
intelli-php-vscode	DEVSENSE	0.12.17700	devsense.intelli-php-vscode-0.12.17700-win32-x64
java	redhat	1.53.0	redhat.java-1.53.0-win32-x64
jupyter	ms-toolsai	2025.9.1	ms-toolsai.jupyter-2025.9.1-win32-x64
jupyter-keymap	ms-toolsai	1.1.2	ms-toolsai.jupyter-keymap-1.1.2
jupyter-renderers	ms-toolsai	1.3.0	ms-toolsai.jupyter-renderers-1.3.0
kotlin	fwcd	0.2.36	fwcd.kotlin-0.2.36
Kotlin	mathiasfrohlich	1.7.1	mathiasfrohlich.kotlin-1.7.1
kotlin-formatter	esafirm	0.0.6	esafirm.kotlin-formatter-0.0.6
LiveServer	ritwickdey	5.7.10	ritwickdey.liveserver-5.7.10
migrate-java-to-azure	vscjava	1.15.0	vscjava.migrate-java-to-azure-1.15.0-win32-x64
mssql	ms-mssql	1.41.0	ms-mssql.mssql-1.41.0
ng-template	Angular	21.2.3	angular.ng-template-21.2.3
npm-intellisense	christian-kohler	1.4.5	christian-kohler.npm-intellisense-1.4.5
pdf	tomoki1207	1.2.2	tomoki1207.pdf-1.2.2
phptools-vscode	DEVSENSE	1.69.18673	devsense.phptools-vscode-1.69.18673-win32-x64
prettier-vscode	esbenp	12.4.0	esbenp.prettier-vscode-12.4.0
profiler-php-vscode	DEVSENSE	1.69.18673	devsense.profiler-php-vscode-1.69.18673
pylint	ms-python	2025.2.0	ms-python.pylint-2025.2.0
python	ms-python	2026.4.0	ms-python.python-2026.4.0-win32-x64
remote-containers	ms-vscode-remote	0.447.0	ms-vscode-remote.remote-containers-0.447.0
remote-explorer	ms-vscode	0.5.0	ms-vscode.remote-explorer-0.5.0
remote-repositories	ms-vscode	0.42.0	ms-vscode.remote-repositories-0.42.0
remote-server	ms-vscode	1.5.3	ms-vscode.remote-server-1.5.3
remote-ssh	ms-vscode-remote	0.122.0	ms-vscode-remote.remote-ssh-0.122.0
remote-ssh-edit	ms-vscode-remote	0.87.0	ms-vscode-remote.remote-ssh-edit-0.87.0
remote-wsl	ms-vscode-remote	0.104.3	ms-vscode-remote.remote-wsl-0.104.3
resx-editor	timheuer	0.2.46	timheuer.resx-editor-0.2.46
sql-bindings-vscode	ms-mssql	0.4.1	ms-mssql.sql-bindings-vscode-0.4.1
sql-database-projects-vscode	ms-mssql	1.5.8	ms-mssql.sql-database-projects-vscode-1.5.8
tree-exporter	TinyMooshGamesInc	1.0.2	tinymooshgamesinc.tree-exporter-1.0.2
volar	Vue	3.2.6	vue.volar-3.2.6
vscode-containers	ms-azuretools	2.4.1	ms-azuretools.vscode-containers-2.4.1
vscode-dotnet-modernize	ms-dotnettools	1.0.1017	ms-dotnettools.vscode-dotnet-modernize-1.0.1017
vscode-dotnet-runtime	ms-dotnettools	3.0.0	ms-dotnettools.vscode-dotnet-runtime-3.0.0
vscode-gradle	vscjava	3.17.2	vscjava.vscode-gradle-3.17.2
vscode-intelephense-client	bmewburn	1.16.5	bmewburn.vscode-intelephense-client-1.16.5
vscode-java-debug	vscjava	0.58.5	vscjava.vscode-java-debug-0.58.5
vscode-java-dependency	vscjava	0.27.1	vscjava.vscode-java-dependency-0.27.1
vscode-java-pack	vscjava	0.30.5	vscjava.vscode-java-pack-0.30.5
vscode-java-test	vscjava	0.44.0	vscjava.vscode-java-test-0.44.0
vscode-java-upgrade	vscjava	2.1.1	vscjava.vscode-java-upgrade-2.1.1
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-maven	vscjava	0.45.1	vscjava.vscode-maven-0.45.1
vscode-microprofile	redhat	0.16.0	redhat.vscode-microprofile-0.16.0
vscode-pylance	ms-python	2026.2.1	ms-python.vscode-pylance-2026.2.1
vscode-python-envs	ms-python	1.24.0	ms-python.vscode-python-envs-1.24.0-win32-x64
vscode-quarkus	redhat	1.22.0	redhat.vscode-quarkus-1.22.0
vscode-react-native	msjsdiag	1.13.0	msjsdiag.vscode-react-native-1.13.0
vscode-remote-extensionpack	ms-vscode-remote	0.26.0	ms-vscode-remote.vscode-remote-extensionpack-0.26.0
vsliveshare	ms-vsliveshare	1.0.5959	ms-vsliveshare.vsliveshare-1.0.5959

C# Settings

Setting	Value
preferCSharpExtension	false
compilerDiagnosticScope	openFiles
analyzerDiagnosticScope	openFiles
enableXamlTools	true
useServerGC	true

System Info

Item	Value
CPUs	13th Gen Intel(R) Core(TM) i9-13950HX (32 x 2419)
GPU Status	2d_canvas: enabled GPU0: VENDOR= 0x8086, DEVICE=0xa788 [Intel(R) UHD Graphics], DRIVER_VENDOR=Intel, DRIVER_VERSION=32.0.101.7084 ACTIVE GPU1: VENDOR= 0x1414, DEVICE=0x008c [Microsoft Basic Render Driver], DRIVER_VERSION=10.0.26100.8115 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 webgl2: enabled webgpu: enabled webnn: disabled_off
Load (avg)	undefined
Memory (System)	31.61GB (14.01GB free)
Process Argv	--crash-reporter-id 4e64a57c-a92b-412a-8b19-54b6d02d1824
Screen Reader	no
VM	0%

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nativeloc1:31344060
dwcopilot:31170013
dwoutputs:31242946
copilot_t_ci:31333650
e5gg6876:31282496
pythonrdcb7:31342333
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aj953862:31281341
63221493:31336333
envsdeactivate2:31464701
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3efgi100_wstrepl:31403338
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ec5jj548:31422691
cp_cls_t_966_ss:31454198
4je02754:31466945
c3h7c220:31478652
ge8j1254_inline_auto_hint_haiku:31427726
38bie571_auto:31429954
cp_cls_t_1081:31454832
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idci7584:31464702
nes-ftch-new:31485413
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nes-extended-on:31455476
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bg_compact_t:31487244
t-some:31486549
cpptoolsoff-v2:31475362
db0gd219:31481871
c5d46265_tst_off:31484208
po_ctrl:31486090
ddid_t:31478206
getcmakediagnosticsoff:31487008
jah3f675:31485061

[davidwengier]

@lukaferro could you share the details of your project? If you use a new project (ie, dotnet new blazor) does the same issue happen? I wonder if some of the steps in dotnet/razor@main/docs/CohostingTroubleshooting.md might be helpful here, specifically around additional files.

I could not reproduce this error today using v2.131.79 of the extension, even when turning off the source generator or trying a Razor file that wasn't in the project etc. so unfortunately I'm at a bit of a loss to how you're geting into this situation. If none of the above helps, could you try setting the "Razor Log" level to "Trace" (the little cog next to the dropdown in the Output pane) and providing those logs after reproducing the issue?

Thanks very much!