[BUG] Errors from Razor generated source files appear in error list

[captainsafia]

When editing a solution that contains Razor files, errors from the underlying C# generated files appear in the error list as seen below:

Repro steps:

1. Clone the dotnet/aspire repo: https://github.com/dotnet/aspire
2. Install latest .NET SDK-preview version
3. Run ./build.sh
4. Run ./start-code.sh
5. Wait for the Aspire.sln to load.
6. Observe the errors in the list.
   I noticed that this appears to be happening to source files that are in our template directory so that might be related to why this granularity of error is showing up.

Also, note that if you click on the error from the list the editor fails to resolve it so the errors are noisy and non-actionable (not that being able to view the generated code makes them that much more actionable).

[jeremy-farrance]

I think this will help... @captainsafia, Can you try rolling back C#Dev Kit to 1.16.6 and C# to 2.63.32 to see if the problem goes away?

[captainsafia]

I think this will help... @captainsafia, Can you try rolling back C#Dev Kit to 1.16.6 and C# to 2.63.32 to see if the problem goes away?

What's unique about this combo and is there another way to reproduce the effect we're trying to achieve here?

[jeremy-farrance]

What's unique about this combo and is there another way to reproduce the effect we're trying to achieve here?

For me this problem has been going on for 3 months now. So I thought it would be helpful point out the last release version where it was working; to help pinpoint the changes that started the problem.

I believe it was the 3rd pre-release after C# v2.63.32 where it began.

So it's not the combo that helps the developers fix the problem. The combo is for the users who need a possible helpful workaround until the real issues get fixed.

[davidwengier]

This doesn't repro for me with C# extension v2.84.19, with or without CDK v1.30.44