Interface Re-Implementation on Windows Runtime

Hey Guys,
I just noticed a weird behavior while trying to compile some code. I just wanted to ask if I am missing something or interface re-implementation is not allowed on Windows Runtime.
So a simple example:
public interface IMyInterface
void MyFirstMethod();
void MySecondMethod();
public class MyFirstClass : IMyInterface
void IMyInterface.MyFirstMethod()
// TODO:
void IMyInterface.MySecondMethod()
// TODO:
public class MySecondClass : MyFirstClass, IMyInterface
void IMyInterface.MyFirstMethod()
// TODO: something else
This would at worst case scenario would give a compiler error but would compile (I think) on a .net application. (see
http://blogs.msdn.com/b/ericlippert/archive/2011/12/08/so-many-interfaces-part-two.aspx and )
Is compilation different on windows runtime? Anybody faced the same issue?
Thanks in advance...
Can Bilgin
Blog
Samples CompuSight

Hi Can,
As a guidance/rule any public class in a WinRT component that we develop should be sealed as otherwise one will start extending unmanaged code in managed code. Same guidance should be applicable to anything that is given by Microsoft (controls in this
case, which are part of namespace Windows.UI.Xaml in Windows.winmd).
For immediate resolution I will suggest you create a Windows Runtime component and in that you extend any WinRT control to do what you are trying. I think that will fix your immediate issue, if that does not work then it is truly a bug.
For why those controls are not sealed I can understand and think that there is a need of a new keyword in C# to mark classes open to extend as WinRT component i.e. unmanaged but sealed for just .NET managed code :)
-- Vishal Kaushik --
Please 'Mark as Answer' if my post answers your question and 'Vote as Helpful'
if it helps you. Happy Coding!!!
My Samples
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