Decorate Pattern

using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;

namespace ConsoleApplication3
{
    abstract class Compnent
    {
        abstract public void Operation();
    }
    class ConcreateCompnent : Compnent
    {
        public override void Operation()
        {
            Console.WriteLine("这是照片");
        }
    }
    class Decorate:Compnent
    {
        Compnent aCompnent;
        public void set(Compnent a)
        {
            aCompnent = a;
        }
        public override void Operation()
        {
            aCompnent.Operation();
        }
    }
    class DecorateA : Decorate
    {
        public override void Operation()
        {
            base.Operation();
            Console.WriteLine("给照片加一个框");
        }
    }
    class DecorateB : Decorate
    {
        public override void Operation()
        {
            base.Operation();
            Console.WriteLine("给照片PS一下");
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            ConcreateCompnent aConcreate = new ConcreateCompnent();
            Decorate aDecorate = new Decorate();
            DecorateB b = new DecorateB();
            DecorateA a = new DecorateA();
            a.set(aConcreate);
            //b.set(a);
            a.Operation();
        }
    }
}