Recently, Win8 was reinstalled, And the development environment was re-built. after VS was installed, an error was reported when ADO. NET Entity Data Model was added to the MVC project.
System. MissingMethodException
Method not found: 'void Microsoft. Data. Tools. Schema. SQL. Build. SqlTaskHost. GetWorkload (Int32 ByRef, System. String ByRef )'.
At Microsoft. VisualStudio. Data. Tools. Package. StatusBarService. TotalWorkload (String & description)
At Microsoft. VisualStudio. Data. Tools. Package. StatusBarService. UpdateStatusBar ()
At Microsoft. VisualStudio. Data. Tools. Package. StatusBarService. OnIdle ()
At Microsoft. VisualStudio. Data. Tools. Package. UI. DataPackage. OnIdle ()
At Microsoft. VisualStudio. Data. Tools. Package. Project. VsPkgIdleProcessingComponent. FDoIdle (UInt32 grfidlef)
Google said that SQL Server Data Tools is broken and needs to be downloaded and installed again.
Download SQL Server Data Tools for Visual Studio 2012
After the installation, it seems that the problem has been fixed!
Reference: http://msdn.microsoft.com/en-us/jj650015