Can we declare sealed method in a class

Question

class X {
    sealed protected virtual void F() {
        Console.WriteLine(\"X.F\");
    }
    sealed void F1();
    protected virtual void F2() {
        Console.W         


        

Answer 1

Well, sealed keyword prevents method from being overriden, and that's why it doesn't make sence

1. with virtual declaration - just remove virtual instead of declaring virtual sealed.
2. on abstract methods, since abstract methods must be overriden
3. on non-virtual methods, since these methods just can't be overriden

So the only option is override sealed which means override, but the last time:

public class A {
  public virtual void SomeMethod() {;}

  public virtual void SomeOtherMethod() {;}
}

public class B: A {
  // Do not override this method any more
  public override sealed void SomeMethod() {;}

  public override void SomeOtherMethod() {;}
}

public class C: B {
  // You can't override SomeMethod, since it declared as "sealed" in the base class
  // public override void SomeMethod() {;}

  // But you can override SomeOtherMethod() if you want
  public override void SomeOtherMethod() {;}
}