Hi

I am trying to solve a problem with COM interop from a C# project. My
C# projet is a Windows Forms project and there is a component that
derives from Forms class. The component also implements an interface
that exposes the ShowDialog method of the Forms class to COM clients
with the return type of DialogResult. The module compiles fine in .NET
1.1, but gives compile errors in .NET 2.0.

In my COM component, I import System.Windows.Forms.tlb and also import
my own .net assembly that has been registered for COM interop (using
regasm.exe).

Here is the pseudo code of my project:

[Guid("516768g2-0024-4d7a-9e51-7ae066t4798b")]
public class MyOwnDlg : System.Windows.Forms.Form, IMyOwnDlg
{
       // implementation here
}

[Guid("8428r56c-afab-48d2-921f-17929955fgf6")]
public interface IMyOwnDlg
{
    System.Windows.Forms.DialogResult ShowDialog();
}

When I compile my COM client, I get the following warnings and errors:

warning C4926: 'WinForms::DialogResult': symbol is already defined:
attributes ignored
error C3115: 'id': this attribute is not allowed on 'IMyOwnDlg'
       predefined C++ attributes (compiler internal)(808) : see
declaration of 'id'
       attribute can only be applied to: 'interface member function',
'interface member', 'IDL module'

Can anyone please point me to some documentation about this change or
shed some light on what could be going on and how do I fix this
problem?

Thanks in advance.