We are experiencing two issues using C# to extend Visual Studio 2003.

The solution being extended contains multiple Enterprise Templates (ETP)
that each contain one or more projects of various types.

The  problem is that we need to extend the properties displayed in the
property browser when an ETP is selected in the Solution Explorer. We found
the CatID “{3B6A4DE6-2332-42b7-B6F6-0AF06993FFA2}” to extend the ETP when
referencing it in our code. However, we have been unable to find the CatID we
need to use when it is selected in the Solution Explorer.

We thought we found the CatID we needed, but there is still a problem casting
the ExtendeeObject that is being passed into the extender.

The CatID for an ETP when it is selected in the solution explorer is
“{E72203D8-B699-4723-8867-03E20F835499}”. To extend the properties of the ETP
we added a key in the registry to
“HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\7.1\Extenders\{E72203D8-B699-4723-8867-03E20F835499}”

Corresponding to our extender, namely “SolutionMisc”. In that key we set the
default value to “{D629F716-77FE-49cd-8F9A-564111B80AFF}”, the GUID for our
extender.

Our extender first check to make sure the object to be extended is what is
expected via the following function:

public bool CanExtend(string ExtenderCATID, string ExtenderName, object
ExtendeeObject)
{
//return true if it can extend the ExtendeeObject as an ETP
if (ExtenderCATID.ToUpper() == “{E72203D8-B699-4723-8867-03E20F835499”)
{
return true;
}
else
{
return false;
}
}

That is now returning true for Enterprise Templates. The next step is to
cast the ExtendeeObject passed as an object in to the method

public object GetExtender(string ExtenderCATID, string ExtenderName, object
ExtendeeObject, EnvDTE.IExtenderSite ExtenderSite, int Cookie)

To find out the type of the ExtendeeObject we used the following line

MessageBox.Show(Information.TypeName(ExtendeeObject));

This showed the type as being “IDispEFNode”.

The current problem is that IDispEFNode does not appear in any documentation
other than on one website
“http://custom.programming-in.net/articles/art14-2.asp?Interop=EFLib”, where
it is simply listed as a member of EFLib classes.

Where can we find this type, or is there another comparable type that will
work? Or how can we extend the ETP Properties ?

TIA
Shai