设计模式学习笔记--备忘录模式

using System;

namespace Memento
{
    /// <summary> 
    /// 作者：bzyzhang
    /// 时间：2016/5/29 6:56:24 
    /// 博客地址：http://www.cnblogs.com/bzyzhang/
    /// Originator说明：本代码版权归bzyzhang所有，使用时必须带上bzyzhang博客地址 
    /// </summary> 
    public class Originator
    {
        private string state;

        public string State
        {
            get { return state; }
            set { state = value; }
        }

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

        public void SetMemento(Memento memento)
        {
            this.state = memento.State;
        }

        public void Show()
        {
            Console.WriteLine("state=" + state);
        }
    }
}

using System;

namespace Memento
{
    /// <summary> 
    /// 作者：bzyzhang
    /// 时间：2016/5/29 6:54:54 
    /// 博客地址：http://www.cnblogs.com/bzyzhang/
    /// Memento说明：本代码版权归bzyzhang所有，使用时必须带上bzyzhang博客地址 
    /// </summary> 
    public class Memento
    {
        private string state;

        public string State
        {
            get { return state; }
        }

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

using System;

namespace Memento
{
    /// <summary> 
    /// 作者：bzyzhang
    /// 时间：2016/5/29 6:59:40 
    /// 博客地址：http://www.cnblogs.com/bzyzhang/
    /// Caretaker说明：本代码版权归bzyzhang所有，使用时必须带上bzyzhang博客地址 
    /// </summary> 
    public class Caretaker
    {
        private Memento memento;

        public Memento Memento
        {
            get { return memento; }
            set { memento = value; }
        }
    }
}

namespace Memento
{
    class Program
    {
        static void Main(string[] args)
        {
            Originator originator = new Originator();
            originator.State = "On";
            originator.Show();

            Caretaker caretaker = new Caretaker();
            caretaker.Memento = originator.CreateMemento();

            originator.State = "Off";
            originator.Show();

            originator.SetMemento(caretaker.Memento);
            originator.Show();
        }
    }
}