设计模式学习笔记之 装饰者模式

代码：

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

namespace DecoratePattern
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.Write("顾客：来一盘饺子\r\n");
            Console.Read(); Console.Read();

            Dumpling dumpling = new Dumpling();
            Console.Write("服务生:"+dumpling.Describe()+" "+dumpling.Cast().ToString()+"元人民币\r\n");
            Console.Read(); Console.Read();

            Console.Write("顾客：等等，再给我拿点醋\r\n");
            Console.Read(); Console.Read();

            Vinegar vingarDumpling = new Vinegar(dumpling);//用“醋”修饰饺子
            Console.Write("服务生:" + vingarDumpling.Describe() + " " + vingarDumpling.Cast().ToString() + "元人民币\r\n");
            Console.Read(); Console.Read();

            Console.Write("顾客：什么，太黑了，醋也要钱，那酱油我也要点\r\n");
            Console.Read(); Console.Read();

            Soy soyVingarDumpling = new Soy(vingarDumpling);//用“酱油”修饰那盘加了醋的饺子
            Console.Write("服务生:" + soyVingarDumpling.Describe() + " " + soyVingarDumpling.Cast().ToString() + "元人民币\r\n");
            Console.Read(); Console.Read();

            Console.Write("顾客：啊，酱油不是和醋算在一起的？\r\n");
            Console.Read(); Console.Read();
            Console.Write("----------顾客吃光了饺子----------\r\n");
            Console.Read(); Console.Read();

            Console.Write("顾客：也太少了点，再来一盘馄饨吧，还有加醋和酱油\r\n");
            Console.Read(); Console.Read();

            Soy soyVingarWonton=new Soy(new Vinegar(new Wonton()));
            Console.Write("服务生:" + soyVingarWonton.Describe() + " " + soyVingarWonton.Cast().ToString() + "元人民币\r\n");
            Console.Read(); Console.Read();

            Console.Write("顾客：cow，再也不来这里吃饭了\r\n");
            Console.Read(); Console.Read();


        }
    }

    /// <summary>
    /// 食物超类
    /// </summary>
    abstract class  Food
    {
       abstract public string Describe();
       abstract public double Cast();
      
    }

    
    /// <summary>
    /// 被修饰者一：馄饨
    /// </summary>
    class Wonton : Food
    {
        public override Double Cast()
        {
            return 10;
        }

        public override string Describe()
        {
            return "馄饨";
        }
    }

    /// <summary>
    /// 被修饰者二：饺子
    /// </summary>
    class Dumpling : Food
    {
        public override Double Cast()
        {
            return 12;
        }

        public override string Describe()
        {
            return "饺子";
        }
    }

    class Vinegar : Food
    {
        private Food _Food;

        public Vinegar(Food Food)
        {
            this._Food = Food;
        }
        public override string Describe()
        {
            return "加醋" + this._Food.Describe();
        }

        public override double Cast()
        {
            return 2 + this._Food.Cast();
        }
    }

    class Soy : Food
    {
        private Food _Food;

        public Soy(Food Food)
        {
            this._Food = Food;
        }
        public override string Describe()
        {
            return "加酱油" + this._Food.Describe();
        }

        public override double Cast()
        {
            return 3 + this._Food.Cast();
        }

    }
    
}

运行结果：