Sealed keyword in association with override

Question

Is it always necessary to follow the sealed keyword with override in the signature of a method like the below code:

public sealed o         


        

Answer 1

Well, it technically is possible .... however, the solution is in my option kinda dirty.

Imagine having a class A (either in your code base or an external library):

public class A
{
    public virtual void M () { /* implementation */ }
}

You could define an (abstract) class B : A as follows:

public class B : A
{
    public sealed override void M() => base.M();
}

Any class C : B would not be able to override A.M as you have sealed the method (even though you made no semantic changes).