Dynamic Binding in C#
c#, dynamic-binding
Solution
In class `C`, the method `WhoAreYou()` doesn't override the base class method, as it is defined with `new` keyword which adds a new method with the same name which hides the base class method. That is why this:
C c = new D();
c.WhoAreYou();// "I am a D"
invokes the overridden method in `D` which overrides its base class method defined with `new` keyword.
However, when the target type is `A`, then this:
A a = new D();
a.WhoAreYou();// "I am a B" !!!!
invokes the overridden method in `B`, as you're calling the method on `a` of type `A` whose method is overriden by `B`.
Problem
``` class A { public virtual void WhoAreYou() { Console.WriteLine("I am an A"); } } class B : A { public override void WhoAreYou() { Console.WriteLine("I am a B"); } } class C : B { public new virtual void WhoAreYou() { Console.WriteLine("I am a C"); } } class D : C { public override void WhoAreYou() { Console.WriteLine("I am a D"); } } C c = new D(); c.WhoAreYou();// "I am a D" A a = new D(); a.WhoAreYou();// "I am a B" !!!! ``` How the reference is allocated internally,reference A contains the reference of B? Can any one explain Whats going On?