Hello,

Below there are two equivalent(?) pieces of C# and VB.Net code.
While the C# version compiles with no warning, the VB.Net version does not
compile due to the compiler error BC30149: Class 'c2' must implement 'Sub
m1()' for interface 'i1'.

Does it mean that in VB interface must be implemented, even if it is already
non-explicitly implemented in the base class c1?

How to make this VB code compile *without altering the c1 class* ? - that is
the constraint!
I can not get it compile in VB, while in C# it is just a piece of cake.

Motivation: I want to access base class methods by interface specified in a
derived class.
As strange as it sounds, in C# it works just as expected - test yourself: i1
c = new c2(); c.m1();

Thank you,

Tomasz
PS. this message has also been posted to microsoft.public.dotnet.framework,
but this group may be a better place for this question.

// C# version
class c1 {
   public virtual void m1() {
   }
}

class c2 : c1, i1 {
}

public interface i1 {
   void m1();
}

' VB version
Class c1
   Public Overridable Sub m1()
   End Sub
End Class

Class c2
   Inherits c1
   Implements i1
End Class

Public Interface i1
   Sub m1()
End Interface