Error in Microsoft Visual Studio 2012 :No exports were found that match the constraint

问题

When I opened my Project in VS2012 , I got an error

No exports were found that match the constraint:

ContractName
Microsoft.VisualStudio.Utilities.IContentTypeRegistryService
RequiredTypeIdentity
Microsoft.VisualStudio.Utilities.IContentTypeRegistryService

Please correct before proceeding. (You might rename the current web.config and add a new one).

Why did this happen, can someone please suggest a solution?

回答1:

I solved this problem by clearing the Visual Studio Component Model Cache. Just delete or rename this folder:

%AppData%\..\Local\Microsoft\VisualStudio\11.0\ComponentModelCache

Or, for Visual Studio 2013:

%AppData%\..\Local\Microsoft\VisualStudio\12.0\ComponentModelCache

回答2:

I have fix this with update :

http://www.microsoft.com/en-in/download/confirmation.aspx?id=36020#

I'm on windows 8.1 and Visual Studio 2012.

回答3:

I encountered similar issue and found this solution like magic. The steps go here:

• Delete ComponentModelCache folder from below location:

C:\Users\\AppData\Local\Microsoft\VisualStudio\11.0

• Make it sure to replace with your real user name on your pc.

• Once deleted, recreate the folder with same name "ComponentModelCache".

• In case, it gives any permissions issue, deleting the remaining files/folders one by one can work well.

The error is no more there when you try to create a project in visual studio.

来源：https://stackoverflow.com/questions/19217506/error-in-microsoft-visual-studio-2012-no-exports-were-found-that-match-the-cons