I work for a source control vendor and I'm currently working on the
"Open From Source Control" functionality.  I'd like to allow projects
to load asynchronously as files are retrieved from the repository, but
I have some questions about the API.

IVsProjectFactory2.GetAsynchOpenProjectType()  "returns the
asynchronous open type that the project supports" according to the
docs.  It looks like I'll get a pointer to something from this
function, but it's not clear what.  Can anybody help alleviate my
ignorance here?

Without understanding GetAsynchOpenProjectType I have tried to get
asynchronous loading of a C# windows application project to work,
without success.  I'll describe what I did here, in the hopes that
somebody can help. :)

I implemented IVsAsynchOpenFromScc, and the C# windows app project
appears to implement IVsAsynchOpenFromSccProjectEvents.  The problem (I
think) is that the project never calls
IVsAsynchOpenFromScc.LoadProject().  I return true for
LoadProjectAsynchronously, and the UI reflects that the project is
loading asynchronously, but then nothing happens.  If I go ahead and
start retrieving files and calling the project's
IVsAsynchOpenFromSccProjectEvents.OnFilesDownloaded(), I get
E_UNEXPECTED failures.  In fact, anything I call on
IVsAsynchOpenFromSccProjectEvents returns that error code.   Does
anybody know how this is supposed to work?  Do C# projects just not
support this?

Thanks much.

Ian Olsen