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

Use dependency injection. Create a BonusCalculator class:

public abstract class BonusCalculator
{
   public abstract decimal CalculateBonus(Employee e)
}

In your base class:

private BonusCalculator Calculator { get; set; }

public void GiveBonus()
{
   Bonus = Calculator.CalculateBonus(this)
}

In your implementation's constructor:

public SomeKindOfEmployee()
{
    Calculator = new SomeKindOfEmployeeBonusCalculator();
}

Someone implementing a Person subclass now has to explicitly provide it with an instance of a BonusCalculator (or get a NullReferenceException in the GiveBonus method).

As an added, er, bonus, this approach allows different subclasses of Person to share a bonus-calculation method if that's appropriate.

Edit

Of course, if PTSalesPerson derives from SalesPerson and its constructor calls the base constructor, this won't work either.