C#•3y ago

✅ Ensure that subclasses all have to override a specific method?

Is it possible to define a method in a class to say that it must be defined in every subclass?

For example, if I have:

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

public class B : A
{
  public override void DoSomething()
  {
    base.DoSomething();
  }
}

public class C : A
{
}

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

public class B : A
{
  public override void DoSomething()
  {
    base.DoSomething();
  }
}

public class C : A
{
}

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

public class B : A
{
  public override void DoSomething()
  {
    base.DoSomething();
  }
}

public class C : A
{
}

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

public class B : A
{
  public override void DoSomething()
  {
    base.DoSomething();
  }
}

public class C : A
{
}

I don't want C to be valid. I can't make

DoSomething()

DoSomething()

DoSomething()

DoSomething() in

A

A abstract, as I want to be able to instantiate A.

If this isn't possible in the language, then my approach will be to change

A

A to an abstract base class

Base

Base

Base

Base with an abstract

DoSomething()

DoSomething()

DoSomething()

DoSomething(), and a

DoSomethingInternal()

DoSomethingInternal()

DoSomethingInternal()

DoSomethingInternal(), and then inherit

A

A from

Base

Base

Base

Base and implement

DoSomething()

DoSomething()

DoSomething()

DoSomething() there

✅ Ensure that subclasses all have to override a specific method?

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