Visual Studio keeps underlining wrong code

Question

Visual Studio keeps underlining wrong code

Jirka 0

Hi,

I am using visual studio 2017 and I am trying 2022 Community.

In both I see underlines under using System.Linq and using System.Web.WebSockets and everything from these is ignored by Visual Studio. For example myArray.FirstOrDefault(a=> true); FirstrOrDefault is underlined, because VS did not recognize using.

It is not only one project.

It is mostly .NET Framework 4.8 projects.

I've tried to find a solution, tried to update everything with VS Installer, tried to set default settings, devenv /ResetSettings, deleted all local files and get projects again. Not a single thing helped.

It would be awesome to get some info about what is going on and how can I fix it. Thanks a lot.

For AI Assist:

Target framework is 4.8
NuGet packages are OK.
Visual Studio is up to date (today).
VS 2022 was installed few days back and its same as 2017 so problem is shared.

Tianyu Sun-MSFT 34,436 Reputation points Microsoft External Staff

2024-12-13T10:00:52.5566667+00:00

Hello @Jirka,

Since the code running correctly, I think this issue is related to the VS IntelliSense.

Sounds the issue persists and can be reproduced on your side easily, I'd like to try to reproduce it on my side to check further. Would you mind sharing me the complete steps with the same sample code on your side to reproduce it?
Tianyu Sun-MSFT 34,436 Reputation points Microsoft External Staff

2024-12-16T09:18:05.07+00:00

Hi @Jirka,

May I know if the issue persists? Is it possible for you to share us the complete steps with the same sample code to reproduce this issue and check further?

Feel free to contact us :)

2 answers

Your answer

Tianyu Sun-MSFT 34,436 Reputation points Microsoft External Staff

2024-12-13T10:00:52.5566667+00:00

Hello @Jirka,

Since the code running correctly, I think this issue is related to the VS IntelliSense.

Sounds the issue persists and can be reproduced on your side easily, I'd like to try to reproduce it on my side to check further. Would you mind sharing me the complete steps with the same sample code on your side to reproduce it?
Tianyu Sun-MSFT 34,436 Reputation points Microsoft External Staff

2024-12-16T09:18:05.07+00:00

Hi @Jirka,

May I know if the issue persists? Is it possible for you to share us the complete steps with the same sample code to reproduce this issue and check further?

Feel free to contact us :)

Answer 1

elsvieta 371

Jirka,

If you are using System.Linq and System.Web.WebSockets, but the necessary assemblies or packages are not referenced in your project, Visual Studio will underline these namespaces. If you do reference them, then System.Linq should be available by default because it is part of the core framework.

Concerning System.Web.WebSockets: does your project support System.Web?

The target framework being 4.8, both System.Linq and System.Web.WebSockets should be recognized.

My best guess at this point is to hover over the underlined namespaces and check the IntelliSense tooltip or the Error List for more specific error messages. This can give you more details about what might be wrong.

Good luck,

elsvieta

Jirka 0 Reputation points

2024-12-11T17:29:41.4033333+00:00

I forgot to tell that code is running ok. System.Web is used OK. But System.Web.WebSockets CS0234 - the namespace name WebSockets does not exist in the namespace System.Web. For example for HttpContext context is context.AcceptWebSocketRequest usable, but underlined as unknown (not contains definition...). Code is working, but its hard to work with IDE which shows errors where they are not and can't help with advice. Edit:

Reference adding: this Web site already referencing the assembly...

Answer 2

Deleted

This answer has been deleted due to a violation of our Code of Conduct. The answer was manually reported or identified through automated detection before action was taken. Please refer to our Code of Conduct for more information.

Comments have been turned off. Learn more

Share via

Visual Studio keeps underlining wrong code

2 answers

Your answer