Compiler errors such as CS0246 are sticky (C# dev kit never sees updates from other files)

[arunchndr]

From vscode-dotnettools created by StephenCleary: microsoft/vscode-dotnettools#418

Type: Bug

Open a file and reference a type that doesn't exist yet. The extension correctly reports a Problem like CS0246. Create another file and add that type.

The CS0246 never clears (until VSCode is restarted). I can successfully compile but the extension never sees updates from other files.

Relevant info: I'm developing inside a Linux devcontainer running on Windows, and file change notifications are not passed through in this scenario.

Extension version: 0.4.5 VS Code version: Code 1.81.1 (6c3e3dba23e8fadc360aed75ce363ba185c49794, 2023-08-09T22:22:42.175Z) OS version: Windows_NT x64 10.0.19045 Modes: Remote OS version: Linux x64 5.10.102.1-microsoft-standard-WSL2

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-10750H CPU @ 2.60GHz (12 x 2592)
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 video_decode: enabled video_encode: enabled vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: enabled
Load (avg)	undefined
Memory (System)	31.79GB (15.02GB free)
Process Argv	--crash-reporter-id 51be58ac-bb42-4ba2-bb04-9b65817a6d47
Screen Reader	no
VM	0%

Item	Value
Remote	Dev Container: Azure Developer CLI
OS	Linux x64 5.10.102.1-microsoft-standard-WSL2
CPUs	Intel(R) Core(TM) i7-10750H CPU @ 2.60GHz (12 x 2592)
Memory (System)	24.88GB (21.09GB free)
VM	0%

A/B Experiments

vsliv368:30146709
vsreu685:30147344
python383cf:30185419
vspor879:30202332
vspor708:30202333
vspor363:30204092
vslsvsres303:30308271
vserr242cf:30382550
pythontb:30283811
vsjup518:30340749
pythonptprofiler:30281270
vshan820:30294714
vstes263cf:30335440
vscod805:30301674
binariesv615:30325510
bridge0708:30335490
bridge0723:30353136
vsaa593:30376534
pythonvs932:30410667
vscaat:30438848
vsclangdc:30486549
c4g48928:30535728
dsvsc012:30540252
pynewext54:30695312
azure-dev_surveyone:30548225
vsccc:30803844
3biah626:30602489
f6dab269:30613381
showlangstatbar:30737416
03d35959:30757346
pythonfmttext:30731395
fixshowwlkth:30771522
showindicator:30805244
pythongtdpath:30769146
i26e3531:30792625
gsofb:30804716
pythonnosmt12:30797651
pythonidxptcf:30805731
pythonnoceb:30805159
dsvsc013:30795093
dsvsc014:30804076
diffeditorv1:30812748

[vchirikov]

Same on windows (without wsl) + dotnet sdk 8.0.100-preview.6.23330.14 vscode-csharp extension - v2.0.413. and there is no error in C# / C# LSP trace logs

It looks like the C# extension will never work, at least we have the option to return to the omnisharp.

[LuckyKang79]

This issue is also reproduced on the latest version of C# extension v2.0.416 for Linux/Mac OS

[mavasani]

Investigating. Sorry for the inconvenience here.

[mavasani]

@StephenCleary @LuckyKang79 can you please confirm if the stale persistent errors you mentioned are in an open file OR a closed file? Additionally, are these coming from an explicit Build/Rebuild command or from intellisense while you type in VSCode?

I tried to reproduce the issue on the latest C#/C# DevKit extension and see that it only repros with closed files, and that is also if the background analysis scope for Compiler diagnostics is set to Open Files. If switched to Full Solution, we do get property diagnostic refresh in the Problems window.

[mavasani]

@vchirikov From the screenshot you shared, your issue seems to be a different one, likely due to some design time build failure where references to corlib/System.Runtime are also not being resolved. Can you please file a separate issue with more details, and if possible a repro? Thanks!

[LuckyKang79]

@mavasani Regardless of whether the background analysis scope of compiler diagnostics is set to "Open File" or "Full Solution" For the Blazor server InAuth project/Blazor WASM project, we will encounter these two errors after opening the Program.cs file

C# version: v2.0.416 VS Code version:1.81.1 Error:

The type or namespace name 'BlazorClient' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'App' could not be found (are you missing a using directive or an assembly reference?)

[{
	"resource": "/home/aapt/BlazorClient/Program.cs",
	"owner": "_generated_diagnostic_collection_name_#2",
	"code": {
		"value": "CS0246",
		"target": {
			"$mid": 1,
			"path": "/query/roslyn.query",
			"scheme": "https",
			"authority": "msdn.microsoft.com",
			"query": "appId=roslyn&k=k(CS0246)"
		}
	},
	"severity": 8,
	"message": "The type or namespace name 'BlazorClient' could not be found (are you missing a using directive or an assembly reference?)",
	"source": "Roslyn",
	"startLineNumber": 3,
	"startColumn": 7,
	"endLineNumber": 3,
	"endColumn": 19
}]



[{
	"resource": "/home/aapt/BlazorClient/Program.cs",
	"owner": "_generated_diagnostic_collection_name_#2",
	"code": {
		"value": "CS0246",
		"target": {
			"$mid": 1,
			"path": "/query/roslyn.query",
			"scheme": "https",
			"authority": "msdn.microsoft.com",
			"query": "appId=roslyn&k=k(CS0246)"
		}
	},
	"severity": 8,
	"message": "The type or namespace name 'App' could not be found (are you missing a using directive or an assembly reference?)",
	"source": "Roslyn",
	"startLineNumber": 6,
	"startColumn": 28,
	"endLineNumber": 6,
	"endColumn": 31
}]

Also I added Environment data details for your reference： dotnet --info output:.

NET SDK:
 Version:   7.0.401
 Commit:    eb26aacfec

Runtime Environment:
 OS Name:     ubuntu
 OS Version:  22.04
 OS Platform: Linux
 RID:         ubuntu.22.04-x64
 Base Path:   /usr/share/dotnet/sdk/7.0.401/

Host:
  Version:      7.0.11
  Architecture: x64
  Commit:       ecb34f85ec

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

.NET runtimes installed:
  Microsoft.AspNetCore.App 7.0.11 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 7.0.11 [/usr/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

[vchirikov]

@vchirikov From the screenshot you shared, your issue seems to be a different one, likely due to some design time build failure where references to corlib/System.Runtime are also not being resolved. Can you please file a separate issue with more details, and if possible a repro? Thanks!

@mavasani, I created the issue https://github.com/dotnet/vscode-csharp/issues/6250 with trace logs

[ErtugrulATES]

@StephenCleary @LuckyKang79 can you please confirm if the stale persistent errors you mentioned are in an open file OR a closed file? Additionally, are these coming from an explicit Build/Rebuild command or from intellisense while you type in VSCode?

I tried to reproduce the issue on the latest C#/C# DevKit extension and see that it only repros with closed files, and that is also if the background analysis scope for Compiler diagnostics is set to Open Files. If switched to Full Solution, we do get property diagnostic refresh in the Problems window.

Thanks so much for solution, It works for me.