Visual Studio Code not displaying warnings or errors

[markvincze]

I created a sample .NET Core project (a class library targeting netstandard2.0) to try StyleCopAnalyzers, and I intentionally made some violations in the code.

I added a reference to StyleCopAnalyzers, and I immediately can see the warnings on build:

dotnet build
Microsoft (R) Build Engine version 15.7.179.6572 for .NET Core
Copyright (C) Microsoft Corporation. All rights reserved.

  Restore completed in 33.55 ms for C:\Workspaces\Github\CodeStyleCheckSample\src\CodeStyleCheckSample\CodeStyleCheckSample.csproj.
MyClass.cs(27,18): warning SA1402: File may only contain a single class [C:\Workspaces\Github\CodeStyleCheckSample\src\CodeStyleCheckSample\CodeStyleCheckSample.csproj]
MyClass.cs(1,1): warning SA1633: The file header is missing or not located at the top of the file. [C:\Workspaces\Github\CodeStyleCheckSample\src\CodeStyleCheckSample\CodeStyleCheckSample.csproj]
...

Or, if I add the <TreatWarningsAsErrors>true</TreatWarningsAsErrors> flag to the csproj, then they show up as Errors.

If I open the solution in Visual Studio, I can nicely see the warnings or errors show up as squigglies.

But if I try it in Visual Studio Code, then I don't see any of these, regardless of whether I set TreatWarningsAsErrors to true or not.

On the other hand, if I make an actual syntax error, that immediately shows up, so the C# integration itself is working properly.

Do you know what I might be doing wrong, or what setting I should change to make the analyzer errors show up in VSCode?

[mvestergaard]

I don't think roslyn analyzers are supported by VSCode/OmniSharp (dotnet/vscode-csharp#43)

[sharwell]

Thanks for the link @mvestergaard 😁

[markvincze]

Thanks for the info!