Why is VS displaying missing namespace errors while the code compiles fine?

Question

I am getting these errors in Visual Studio:

Error CS0234 The type or namespace name 'X' does not exist in the namespace 'Y' (are you missing an assembly reference?)

But the namespace and type in fact exist and the code compiles just fine. So I assumed this was a cache related issue, the things I've tried:

Clean/Rebuild
Clear Temp folder
Remove ComponentModelCache as explained here
Clear ReSharper cache
Delete bin/obj folders

None of them seems to work. I'm using Visual Studio 2017 v15.8.0.

I don't know if it's related but this started happening after I created another branch, made a hard reset to a commit that was two years ago and then checkout to the current branch. Everything works fine, as I said project compiles but the errors are not going away from the IDE.

How can I get rid of them?

Have you tried [**deleting `.vs/{solution}/vs15/.suo`**](https://stackoverflow.com/a/33477634/2341603)? — Obsidian Age, Aug 16 '18 at 22:16
@ObsidianAge thanks! that was it. if you post is as answer I can accept. — Selman Genç, Aug 16 '18 at 22:19

score 3 · Accepted Answer · edited Aug 16 '18 at 22:34

3

According to this earlier answer (pertaining to Visual Studio 2015), deleting .vs/{solution}/vs15/.suo should work.

edited Aug 16 '18 at 22:34

ChrisGPT was on strike

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answered Aug 16 '18 at 22:20

Obsidian Age

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Olivier Jacot-Descombes · Answer 2 · 2018-08-16T22:19:17.683

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What else you can try:

If the type is in a referenced project or assembly: Remove the reference and re add it.
Close VS and reopen it.

Usually Clean/Rebuild is sufficient. Clearing the component cache helps when components are broken.

edited Aug 16 '18 at 22:19

answered Aug 16 '18 at 22:16

Olivier Jacot-Descombes

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forgot to list it but already tried this as well. – Selman Genç Aug 16 '18 at 22:17

Why is VS displaying missing namespace errors while the code compiles fine?

2 Answers2