継承の時はメンバの初期化に注意。

InheritedMember.cs

using System;
using System.Text;

	static void Main (string[] args)
	{
        StringBuilder sb = new StringBuilder ();
    	B b = new B ();
    	sb.AppendLine ("B:" + b.NAME);
    	sb.AppendLine ("A:" + (new SomethingA(b)).str);
    	D d = new D ();
    	sb.AppendLine ("D:" + d.NAME);
    	sb.AppendLine ("C:" + (new SomethingC(d)).str);
    	Console.WriteLine( sb.ToString() );
	F f = new F ();
	sb.AppendLine ("F:" + f.NAME);
	sb.AppendLine ("E:" + (new SomethingF(f)).str);
	}
		public class SomethingA{
			public string str;
			public SomethingA(A a){this.str = a.NAME;}
		}
		public class SomethingC{
			public string str;
			public SomethingC(C a){this.str = a.NAME;}
		}
		public class SomethingF{
			public string str;
			public SomethingF(E e){this.str = e.NAME;}
		}
		public abstract class A{
			public string NAME;
			public class Window{};
		}
		public class B : A
		{
			public string NAME = "B";
			public class Window{
				/*				hogehoge*/
			}
		}
		public abstract class C{
			public abstract string NAME{get;}
			public class Window{};
		}
		public class D : C
		{
			public override string NAME{get{return "D";}}
			public class Window{
				/*				hogehoge*/
			}
		}
		public abstract class E{
			public string NAME;
			public E(){this.NAME = "E";}
			public class Window{};
		}
		public class F : E
		{
			public string NAME = "F";
			public F(){base.NAME = "G";}
			public class Window{
				/*								hogehoge*/
			}
		}
}
/*
結果
B:B
A:
D:D
C:D
F:G
E:E
*/