Question

I’m trying to define a method in my vb.net interface that will only accept objects that inherit from the same interface and are also of the same class as the instance which receives the method call. Is this possible in vb.net?

Below I try to illustrate with a (invalid) generic type constraint what I wish to do:

Public Interface IFoo

   CompareStuff(Of T as sametype)(obj as T) as Boolean

End Interface

Answer 1

Public Interface IFoo(Of T)
    CompareStuff(obj As T) As Boolean

Use like this:

Public Class Foo Implements IFoo(Of Foo)
    Function CompareStuff(obj As Foo) As Boolean

but unfortunately also allows this to compile:

Public Class Bar Implements IFoo(Of Foo)
    Function CompareStuff(obj As Foo) As Boolean

Can’t think of anything properly constraining right now.