问题
I have noticed weird issue with Visual Studio 2019 v16.0.1 the intellisense about "Using directive is unncessary" normally grey is missing and type reference suggestion for missing using is not working.
For the same suggestion i get both item working fine for visual studio 2017, so i am not sure if there is a setting that is turned off or i am missing something.
I also tried with Visual Studio 2019 Preview but no luck.
I have tried the following:- 1.) deleted .vs folder and restarted. 2.) Reinstalled Visual Studio 3.) Reset settings via import and export setting under tools
Any other suggestion will be appreciated.
来源：https://stackoverflow.com/questions/55659693/visual-studio-2019-v16-0-1-intellisense-partially-not-working