C# Nested Class Access Parent Member [duplicate]

Question

Is it possible to access a parent member in a child class...

class MainClass {
  class A { Whatever }

  class B {
    List<A> SubSetList;

    public void AddNewItem(A NewItem) {
       Check MasterListHere ????
    }
  }

  List<A> MasterList;
}

So... my main class will have a master list. It will also have a bunch of instances of B. In each instance of B, I want to add new A's to the particular B, but only if they exist in the Master List. I toyed with making the MasterList static and it works ... until I have more than one instance of MainClass... which I will have.

I could pass a reference to MasterList to each instance of B, but I will eventually have multiple of these "MasterLists" and i don't want to have to pass lots of references if i don't have to.

Answer 1

In C# there is actually no implicit reference to the instance of the enclosing class, so you need to pass such a reference, and a typical way of doing this is through the nested class' constructor.

Answer 2

You can use something like this:

class B {
    private MainClass instance;

    public B(MainClass instance)
    {
        this.instance = instance;
    }

    List SubSetList;

    public void AddNewItem(A NewItem) {
       Check MasterListHere ????
    }
  }