问题
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:
- deleted .vs folder and restarted.
- Reinstalled Visual Studio
- Reset settings via import and export setting under tools
Any other suggestions will be appreciated.
回答1:
Go to Tools -> Options -> Text Editor -> All Languages -> General. Make sure “Auto List Members” is checked. Also, make sure “Parameter Information” is checked.
回答2:
I think these issues are discussed here and are resolved by an update and some worksrounds are bring discussed:
https://developercommunity.visualstudio.com/content/problem/505489/cannot-navigate-to-the-symbol-under-the-caret-3.html
回答3:
For anyone who are searching for another suggestion, I just go throught this issue, as OP said, I've deleted .vs folder, I've update vs to last version, I've uninstalled and reinstalled vs to the last version, I've reset settings, delete all obj folders, I've installed Microsoft.Net.Compilers but nothing worked, at the end I just remembered that sometimes the projects required WindowsBase library, until now I don't know why, but after adding that dll Intellisense started to function again.
回答4:
- Close Visual Studio
- Delete
.vsfolder - Start Visual Studio
Solved my problem
NOTE 1: I am using Visual Studio 2019, but it may work on other versions
NOTE 2: This did not solve the OP problem, but it is a good candidate to solve your
来源：https://stackoverflow.com/questions/57474785/visual-studio-2019-go-to-definition-and-intellisense-not-working