Provides top-level manipulation or maintenance of the solution.
Assembly: Microsoft.VisualStudio.Shell.Interop (in Microsoft.VisualStudio.Shell.Interop.dll)
A project reference is a string value that is used as a unique project identifier and that is independent of which solution uses the project. The project reference is composed of the following:
Project type GUID
Each __VSPROPID must return a VARIANT structure filled with the proper VT_ type. The caller may assume that the VT_ is correct; that there is no need to call VariantChangeType, or to verify the type, beyond an ASSERT to make sure there weren't header file mismatches and related problems.
This same logic applies to the caller when setting the property. The solution will assume that the caller has passed a VARIANY already converted to the proper VT_ type.
Called to manage solutions. IVsSolution is implemented by the environment through the SVsSolution service.