Why collections classes in C# (like ArrayList) inherit from multiple interfaces if one of these interfaces inherits from the remaining?

Question

When I press f12 on the ArrayList keyword to go to metadata generated from vs2008, I found that the generated class declaration as follows

public class Array         


        

Answer 1

My guess would be that the CLR does not support an interface that inherits from another interface.

C# however does support this construct but has to 'flatten' the inheritance tree to be CLR compliant.

[Edit]

After taking advise from below quickly setup a VB.Net project:

Public Interface IOne
    Sub DoIt()
End Interface

Public Interface ITwo
    Inherits IOne
    Sub DoIt2()
End Interface

Public Class Class1
    Implements ITwo

    Public Sub DoIt() Implements IOne.DoIt
        Throw New NotImplementedException()
    End Sub

    Public Sub DoIt2() Implements ITwo.DoIt2
        Throw New NotImplementedException()
    End Sub
End Class

Compiling results in the following (C#):

public class Class1 : ITwo
{
    public Class1();
    public void DoIt();
    public void DoIt2();
}

This show that VB.Net does NOT flatten the interface hierarchy as opposed to C#. I have no clue as to why this would be.