How to force overriding a method in a descendant, without having an abstract base class?

Question

Question Heading seems to be little confusing, But I will Try to clear my question here.

using System;
using System.Collections.Generic;
usi         


        

Answer 1

I feel like this indicates that your implementation really has two parts: a partial implementation that goes in the base class, and a missing completion to that implementation that you want in the sub class. Ex:

public abstract class Base
{
   public virtual void PartialImplementation()
   {
      // partial implementation
   }
}

public sealed class Sub : Base
{
   public override void PartialImplementation()
   {
      base.PartialImplementation();
      // rest of implementation
   }
}

You want to force the override, since the initial implementation is incomplete. What you can do is split your implementation into two parts: the implemented partial part, and the awaiting-implementation missing part. Ex:

public abstract class Base
{
   public void PartialImplementation()
   {
      // partial implementation

      RestOfImplementation();
   }

   // protected, since it probably wouldn't make sense to call by itself
   protected abstract void RestOfImplementation();      
}

public sealed class Sub : Base
{
   protected override void RestOfImplementation()
   {
      // rest of implementation
   }
}