Upgrading Duplicated Declarations

This feature applies just for C# code generation. It occurs because the output could produce a duplication of declarations. This duplication could be generated when an implementing method has the name <Interface>_<Member> and the implementing class already has a member named <Member>, or when there are more than one implemented interfaces and there are two implementing members with the same names.

For these cases, .NET provides the Explicit Interface Declaration syntax that qualifies the member declaration in order to avoid this conflict. So the upgrading process for an implementing member, which name conflicts with another declaration in the implementing class or in another implemented interface, must be generated using this syntax. It consists in adding a prefix with the qualification of the interface that this member is implementing.

The second change consists in changing the references to that member using a casting to the interface.

Original VB6 code

AnInterface1.cls

Public Function MyFoo()
End Function
Public Property Get AProp() As Integer
End Property

AnInterface2.cls

Public Function MyFoo()
End Function

AClass.cls

Implements AnInterface1
Implements AnInterface2
Public Function AnInterface1_MyFoo()
    Dim i As Integer
    i = AnInterface1_AProp
End Function
Public Function AnInterface2_MyFoo()
    ' Code
End Function
Public Property Get AnInterface1_AProp() As Integer
    ' Code
End Property
Public Property Get AProp() As Integer
    AProp = 0
End Property

VBUC resulting C#.NET code

internal class AClass
    : AnInterface1, AnInterface2
    {
    
        object AnInterface1.MyFoo()
        {
               int i = ((AnInterface1)this).AProp;
            return null;
        }
        object AnInterface2.MyFoo()
        {
            // Code
            return null;
        }
        int AnInterface1.AProp
        {
            get
            {
                return 0;
            }
        }
        public int AProp
        {
            get
            {
                return 0;
            }
        }
    }