备忘录模式 c#

　　备忘就是为了恢复数据嘛， 电脑系统知道什么需要保存什么不需要保存，文件夹只提供保存的位置，不关心具体的保存行为。

 

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

namespace ConsoleApplication1
{
    class Program
    {

        public class Memento
        {
            private string status;

            public string Status
            {
                get
                {
                    return status;
                }

                set
                {
                    Console.WriteLine("status is " + status);
                    status = value;
                }
            }

            public Memento(string status)
            {
                this.status = status;
            }
        }

        public class MicrosoftSystem
        {
            private string status;

            public string Status
            {
                get { return status; }
                set
                {
                    status = value;
                }
            }

            public Memento CreateMemento()
            {
                return new Memento(status);
            }

            public void RecoverSystem(Memento m)
            {
                this.status = m.Status;
            }

        }

        public class Folder
        {
            private Memento memento;

            public Memento RecoverMememto()
            {
                return this.memento;
            }

            public void SaveMemento(Memento memento)
            {
                this.memento = memento;
            }

        }



        static void Main(string[] args)
        {
            MicrosoftSystem winXp = new MicrosoftSystem();
            Folder folder = new Folder();
            winXp.Status = "hehe";
            folder.SaveMemento(winXp.CreateMemento());

            winXp.Status = "haha";
            winXp.RecoverSystem(folder.RecoverMememto());

            Console.WriteLine(winXp.Status);
        }
    }
}