Visual Studio displaying errors even if projects build
回答1
If you have ReSharper, try emptying the ReSharper cache:
In menu, ReSharper > Options > Environment > General > Clear Caches
and disabling and re-enabling ReSharper:
In menu, Tools > Options > ReSharper > General > Suspend / Restore
回答2
Clearing Resharper's cache did not help in my case, tried suspend/restore, and also Repair Resharper, using latest download off JetBrains' website - neither of these helped. This is after I tried close/reopen VS, restart my machine, repeat, Build/Rebuild and combination thereof.
It's interesting that suspending Resharper seemed to solve the problem after the 2nd restart of VS, but it was back after I enabled Resharper <-- I tried to do this sequence 2-3 times to ensure the pattern.
Anyway, I was still having issues when I found this article:
So I deleted the hidden .SUO file on the same folder level with solution, and it magically solved all reds.
Note - for Visual Studio 2015, the .SUO file is in .vs/[solution_name]/v14 hidden folder.