I have noticed a weird issue with Visual Studio 2019 v16.0.1 the IntelliSense about "Using directive is unnecessary" normally grey is missing and type reference suggestion for missing using is not working.
I also tried with Visual Studio 2019 Preview but no luck.
I have tried the following:
Any other suggestions will be appreciated.
Troubleshooting# If you find IntelliSense has stopped working, the language service may not be running. Try restarting VS Code and this should solve the issue. If you are still missing IntelliSense features after installing a language extension, open an issue in the repository of the language extension.
Note: We have several Preview features which are off by default and can be enabled through the Tools > Options > IntelliCode page.
Answers. Don't close Visual Studio but close all the files and open them again by clicking on the file in the solution. The file might have been opened by Source Safe or you maybe opened it from Windows Explorer. In this case the file doesn't get assosiated with your solution and the Go to Def.
If you are facing this issue with Unity projects then,
This will restart Visual Studio with your project.
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