Abstract Derived class without abstract method implementation

Question

Assume I have a class as:

public abstract class BaseClass
{
   internal abstract void Add(int i , int j);
}

a child class as:

public class Child : BaseClass
{

}

as I am inheriting Child class from BaseClass I should implement Add() method in it but I do not want to implement Add method here is it possible? If possible how can I achieve it?

Thanks in advance

Answer 1

If you dont want to implement the method, you could do the following:

1. Mark Child as abstract too:

   public abstract class Child : BaseClass { }
   

2. Or, make the method virtual:

   public abstract class BaseClass 
   {
       internal virtual void Add(int i , int j) { }
   }
   

3. Or, override the method and make it virtual:

   public abstract class Child : BaseClass
   {
       // Empty method does nothing; also could be overridden.
       internal override void Add(int i , int j) { } 
   }