Hello,

I've got a COM object that is being returned to me from a
COM method invocation. I don't know the type / COM
interfaces of the object returned to me, since this
varies between invocations. However, I would like to
determine the interfaces of the returned COM object, and
then cast the object at runtime to the correct Interface.
I solved the problem by just trying to cast to the
different interfaces possible, and checking if the cast
is successfull. There must be a better way. Does anybody
know how?

Regards, Beat Nideröst

Assembly Interop.InDesign, generated in Visual
Studio .NET 2003 from a COM typelibrary, contains
namespace InDesign with the COM Interfaces:

InDesign.Objects foundObjects = (InDesign.Objects)
textFrame.Search("", true, true, ""); // textFrame is a
COM Object exposing method Search()

foreach (System.MarshalByRefObject obj in foundObjects)
{
 InDesign.TextWord textWord = obj as InDesign.TextWord;
 if (null != textWord)
   textWord.TextContents = Value;
 else
 {
   InDesign.TextStyleRange styleRange = obj as
InDesign.TextStyleRange;
   if (null != styleRange)
   {
... etc. ...
   }
 }
}