设计模式 之 装饰者

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

namespace 装饰
{
    class Program
    {
        //办公桌
        public class officeDesk
        {
            public officeDesk()
            { }
            private string userName;
            public officeDesk(string userName)
            {
                this.userName = userName;
            }
            public virtual void show()
            {
                Console.WriteLine("{0}的办公桌：",userName );
            }
        }
        //装饰者
        public class Decorator : officeDesk
        {
            //需要知道装饰对象，对应UML中的聚合
            protected officeDesk desk;
            //装扮办公桌
            public void setDecortate(officeDesk desk)
            {
                this.desk = desk;
            }

            public override void show()
            {
                if (desk!=null)
                {
                    desk.show();
                }
            }

        }

        //具体装饰类
        //电脑
        public class computer:Decorator
        {
            public override void show()
            {
                base.show();
                Console.WriteLine("一台电脑 ");
            }
        }
        //电话
        public class telephone : Decorator
        {
            public override void show()
            {
                base.show();
                Console.WriteLine("一部电话 ");
            }
        }
        //文件夹
        public class file : Decorator
        {
            public override void show()
            {
                base.show();
                Console.WriteLine("一个文件夹 ");
            }
        }
        //盆栽
        public class plant : Decorator
        {
            public override void show()
            {
                base.show();
                Console.WriteLine("一盆盆栽 ");
            }
        }
        //签字笔
        public class pen : Decorator
        {
            public override void show()
            {
                base.show();
                Console.WriteLine("一支签字笔 ");
            }
        }
        //公章
        public class seal : Decorator
        {
            public override void show()
            {
                base.show();
                Console.WriteLine("一个公章 ");
            }
        }


        static void Main(string[] args)
        {
            officeDesk renZong = new officeDesk("任总");

            computer computer = new computer();
            telephone telephone = new telephone();
            file file = new file();
            plant plant = new plant();
            pen pen = new pen();
            seal seal = new seal();

            computer.setDecortate(renZong);
            telephone.setDecortate(computer);
            file.setDecortate(telephone);
            plant.setDecortate(file);
            pen.setDecortate(plant );
            seal.setDecortate(pen);
            seal.show();

            Console.WriteLine();
            officeDesk xiaoLi = new officeDesk("小李");

            computer.setDecortate(xiaoLi);
            file.setDecortate(computer);
            pen.setDecortate(file );
            pen.show();

            Console.Read();
        }
    }
}

       装饰者是在不改变原内容的基础上，动态地增加新的行为；

       策略是以切换运算法则的方式变换功能。

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设计模式 之 装饰者

原文：http://blog.csdn.net/ry513705618/article/details/38474803