装饰者模式

using System;

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            //先造一部手机
            SJ sj = new SjLoad();
            //再给手机贴膜
            SJ sjm = new SJM(sj);
            Console.WriteLine(sjm.Getsj());
            //加了挂饰的手机
            SJ gs = new GS(sj);
            Console.WriteLine(gs.Getsj());
            //贴了膜又加挂饰手机
            SJ gsm = new GS(sjm);
            Console.WriteLine(gsm.Getsj());

            
            SJ ren = new Ren();
            
            SJ sq = new SQ(ren);
            
            SJ rm = new RM(sq);
            Console.WriteLine(rm.Getsj());
            Console.Read();
        }
    }  

    //建造厂
    public abstract class SJ
    {     
        //建造功能
        public abstract string Getsj();
    }

    //先造一部手机
    public class SjLoad:SJ{
        public override string Getsj()
        {
            return "手机";
        }
    }

    //给建造厂配备装饰功能
    public abstract class ZS:SJ
    {
        private SJ sj;   //准备装手机的容器
        public ZS(SJ s) //拿一个手机过来
        {
            this.sj = s;    //把手机装进容器
        }

        //经过装饰的手机
        public override string Getsj()
        {
            return sj.Getsj();
        }
    }

    //给手机贴膜
    public class SJM : ZS
    {
        public SJM(SJ sj)   //拿过来一个手机
            :base(sj)
        {
        }
        //给手机贴膜
        public override string Getsj()
        {
            return "贴了膜的"+base.Getsj();
        }
    }

    //加挂饰
    public class GS : ZS
    {
        public GS(SJ sj):base(sj) { }
        public override string Getsj()
        {
            return "+挂饰"+base.Getsj();
        } 
    }

    
    public class Ren : SJ
    {
        public override string Getsj()
        {
            return "aaa";
        }
    }

    
    public class SQ : ZS
    {
        public SQ(SJ s) : base(s) { }   
        private string dsq = "ccc";
        public override string Getsj()  
        {
            return dsq+ base.Getsj();
        }
    }

    
    public class RM : ZS
    {
        public RM(SJ s) : base(s) { }

        private string rmao = "bbb";
        public override string Getsj()
        {
            return rmao+ base.Getsj();
        }
    }
}