----------
20200326

visual studio 2019:
C:\Users\[yourname]\AppData\Local\Microsoft\VisualStudio\16.0_1bb3238e

ASP.NET:
C:\Users\[yourname]\AppData\Local\Temp\Temporary ASP.NET Files\root\23f0790b\8c49ea6f\assembly\dl3\cc9baf6c\3e830111_b5d1d401\LibSQL.dll
C:\Users\[yourname]\AppData\Local\Temp\Temporary ASP.NET Files\root
C:\Users\[yourname]\AppData\Local\Temp\Temporary ASP.NET Files\vs

----------
20190303

清除 cache:
C:\Users\[yourname]\AppData\Roaming\Microsoft\VisualStudio\14.0
C:\Users\[yourname]\AppData\Local\Microsoft\VisualStudio\14.0
ASP.NET:
C:\Users\[yourname]\AppData\Local\Temp\Temporary ASP.NET Files\root\23f0790b\8c49ea6f\assembly\dl3\cc9baf6c\3e830111_b5d1d401\LibSQL.dll

%APPDATA% = C:\Users\[yourname]\AppData\Roaming
%userprofile% = C:\Users\[yourname]\

%localappdata%\Microsoft\VisualStudio\14.0\ComponentModelCache. 

或使用
Clear_MEF_Component_Cache_v1.4.29.vsix
ref:
https://marketplace.visualstudio.com/items?itemName=MadsKristensen.ClearMEFComponentCache


----------
1. Close all instances of VS
2. delete everything in this 2 folders as below cache:
C:\Users\<your users name>\AppData\Local\Microsoft\VisualStudio\14.0 
C:\Users\<your users name>\AppData\Roaming\Microsoft\VisualStudio\14.0
ASP.NET:
C:\Users\[yourname]\AppData\Local\Temp\Temporary ASP.NET Files\root\23f0790b\8c49ea6f\assembly\dl3\cc9baf6c\3e830111_b5d1d401\LibSQL.dll

3. Restart VS 2015