Best way to refer to my own type

Question

abstract class A where T:A
{
    public event Action Event1;
}

class B : A
{
    //has a field called Action Event1;
}
         


        

Answer 1

Since A is abstract, you can add abstract methods to A and invoke them from A and B, which will be forced to implement the method, will be the invoker:

abstract class A where T:A
{
    public event Action Event1;
    public abstract void Method();

    public A(){Method();}
}

class B : A
{
    //has a field called Action Event1;
    public void Method(){ //stuff }
}

On instantiation of B, the base class constructor will call Method() which is only implemented in B, forcing B's instance to be called.

This allows A to invoke subclass specific methods without requiring A to have specific knowledge of Children. The downside is that ALL children must implement Method or re-abstract it to their own children.