Question

I have two classes A and B, B inheriting from A and additionally having a member of type List<OtherObject>.

Now I would need a reference to the List.Count property in class A reflecting changes that happen to the List in class B (removing/adding items). What’s the best way to accomplish that, without changing the int member in class A by myself?

EDIT: OK, it is a little bit more complicate and I have some simplified code here for explanation: The int member myCount should hold the reference I was talking about.

public abstract class A{
protected int myCount;

    public void Process()
    {

        ProcessSpecificRequest();

        if(myCount == 0){
            //Do something
        }
    }

    protected abstract void ProcessSpecificRequest();

    }

public class B: A {
private List<Object> myList;

    protected override void ProcessSpecificRequest()
    {
    //Do something with the List

    }

}

Answer 1

class A {
    public abstract int ListCount { get; }
}

class B : A {
    protected List<object> BList = new List<object>();
    public override int ListCount {
        get {
            return BList.Count;
        }
    }
}