.cs files can't be opened anymore in VS 2013 Professional Update 4
问题 I'm facing a problem where I can't open .cs files in Visual Studio 2013 after one day. It started on Monday: I opened an existing solution and tried to open the Program.cs file but instead was met with the following error message (rough translation): No exports were found that meet the constraint: ContractName Microsoft.VisualStudio.Utilities.IContentTypeRegistryService RequiredTypeIdentity Microsoft.VisualStudio.Utilities.IContentTypeRegistryService I tried opening .cs files in different