Visual Studio not recognizing Unity Namespaces

Hi,

I have this issue where after upgrading to Unity Plus and Unity Teams Advanced and Collaborate, my visual studio isn't working. When I open a script, all of the unity namespaces have red squiggly lines underneath (and all related functions and variable also have red lines underneath). Technically, everything still works, so unity is parsing it correctly, but VS won't recognize it. Makes it very difficult to write code. What would be the cause of this? I did change my unity user as well in case that might be an issue.

I just downloaded a new copy of Unity with VS thinking that maybe something wasn't lining up, but nothing. Now, I didn't delete Unity or VS before downloading, thinking it would just overwrite both of them, but maybe it didn't overwrite VS. Should I download again after deleting both Unity and VS?

Thanks for any help you can provide

 

Update: I deleted Unity and VS, and redownloaded both from the Unity Download Assistant, to ensure that I have compatible versions. It is still doing it. Has anyone else had an issue like this?

 

Update 2 (giving more information so you know what I have or haven't tried): Deleted .sln and .csproj files, and the entire Library folder to allow Unity to rebuild. Still getting the same issue. I am running out of ideas here. I really can't have this delay in my workflow. If anyone has any ideas, I would be eternally grateful.

 

I've had this issue stemming from two different causes. One was unsolvable (https://forum.unity.com/threads/namespace-cannot-be-found-error.605683/), the other was a simple fix (https://forum.unity.com/threads/unity-visual-studio-unexpected-behaviours.601999/). I hope that helps.

 

Thanks for your reply. I have all my scripts in the Assets/Scripts folder, so that second thread probably doesn't apply. Might just be a bug that has yet to be squashed. I have resorted to using a different script editor. I much prefer VS, but you gotta what you gotta do I guess.

 

I found this error in VS, I'm guessing this is what is going wrong, but not sure how to fix. I manually obfuscated the path for security reasons and because it isn't relevant: Error MSB4019: The imported project "/Users/**********/obj/Assembly-CSharp.csproj.*.props" was not found. Confirm that the path in the <Import> declaration is correct, and that the file exists on disk. (MSB4019) (Assembly-CSharp).

 

Ok, so I was able to fix this issue. Following is the solution in case it helps anyone:

I realized that my associate named the new Unity project (because of Unity Teams Advanced and Collaboration) with a colon in it. So when VS went to make the solution file, it would name it based off of the folder name, but since it didn't like the colon, it would use a forward slash instead (big problem). I tried renaming it, but it would just keep recreating a solution using the forward slash because of the bad project name. So I renamed the project name to no longer have a colon, I deleted all .sln and .csproj files again, and I also deleted .vs directory (holds temp data and thought it might be interfering. It is automatically regenerated by VS, so no reason to not delete this). If you don't know how to delete .vs, go to your Terminal (Mac instructions), navigate to the project folder, and type "rm -R .vs". Simple as that.

I had to find my project again as Unity didn't recognize the new name. Opened it up, opened a script in VS, and it worked!

TL;DR, The name of the project folder had an incompatible character causing the .sln file to fail. Hope this helps someone!

 

Thanks a lot lifetree that helped me

 

So fond of your attitude in this post

 

I was having this issue as well. It was fixed for me by removing and reinstalling Visual Studio Editor from the Package Manager.

How to reinstall Video Studio Editor

• The package manager can be accessed through Window > Package Manager
• in the top left make sure you have "Packages: Unity Registry" selected
• search in the top right for Visual Studio Editor.
• Once you have that package selected it will say "remove" in the bottom right
• after removing, you'll see a button in the bottom right to reinstall

The most likely reason for this issue in my case was upgrading the project file to a new Unity version and then downgrading it

 

After 6 hours trying everything, mgushanasjr solution worked for me!

 

reinstalling Visual Studio Editor from the Package Manager worked for me also, thank you

 

While we're here, this may help you with intellisense and possibly other Visual Studio integration problems:

https://forum.unity.com/threads/intellisense-not-working-with-visual-studio-fix.836599/

Also, try update the VSCode package inside of Unity: Window -> Package Manager -> Search for Visual Studio Code Editor -> Press the Update button

Also, this: https://forum.unity.com/threads/no-suggestions-in-vscode.955197/#post-6227874

 

The solution by lifetree worked in my case! I was having similar problems after moving the project folder (no renaming though): TMPro and Firebase namespaces not recognized by VS, still everything was working in Unity Editor. Thank you!

 

I found the easiest solution for struggling with this. Go to the player settings, check all the libraries and update. Do a build in visual studio. Fixes all the issues, then go back and uncheck all but the first 2 and everything works again.

 

IMPORTANT: Visual studio doesn't like Unity paths with symbols and spaces

 

In Unity Edit -> Preferences -> External Tools -> Select your external script editor

 

I also reinstalled Visual Studio by the Package Manager and resolved the issue. Using Unity 2021.3.14f1 and VS Community 2019.

 

reinstalling it from package manager solved it me as well. ty