public class A
{
public virtual void Write() { Console.Write("A"); }
}
public class B : A
{
public override void Write() { Console.Write("B"); }
}
public class C : B
{
new public virtual void Write() { Console.Write("C"); }
}
public class D : C
{
public override void Write() { Console.Write("D"); }
}
// ...
D d = new D();
C c = d;
B b = c;
A a = b;
d.Write();
c.Write();
b.Write();
a.Write();
Why doesn’t D Write() override B Write() if the actual object that b is referencing is D?
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The reason is that in C you have:
new public virtual void Write() { ... }
Which means it no longer overrides B.Write() (which overrides A.Write().
Then D.Write() overrides the Write method in its direct base class – C.
If you change the method in C to be:
public override void Write() { ... }
All the classes in your hirachy will override the same method in A and you will get the output you expect (DDDD).