How to invoke (non virtually) the original implementation of a virtual method?

Question

I have the following situation:

In a 3rd party library (can not be modified):

class A { public virtual void M() {} }

class B : A { public override v         


        

Answer 1

You cannot do that. You should probably design your class hierarchy differently, because it looks strange that C inherits from B, while behaving like A.

Anyway, it could make sense in your case. Then you should make another method in A which you will not override:

class A {
    protected virtual void basicM() {}
    public virtual void M() { basicM(); }
}
class C {
    public override void M() { basicM(); }
}

BTW, if you name the method as I did in the example, then you should probably rethink the whole thing. If this hierarchy is justified, than basicM probably performs something that deserves to be a separate method with a different name, perhaps even a public method.