设计模式学习笔记--备忘录模式

 1 using System;
 2 
 3 namespace Memento
 4 {
 5     /// <summary> 
 6     /// 作者：bzyzhang
 7     /// 时间：2016/5/29 6:56:24 
 8     /// 博客地址：http://www.cnblogs.com/bzyzhang/
 9     /// Originator说明：本代码版权归bzyzhang所有，使用时必须带上bzyzhang博客地址 
10     /// </summary> 
11     public class Originator
12     {
13         private string state;
14 
15         public string State
16         {
17             get { return state; }
18             set { state = value; }
19         }
20 
21         public Memento CreateMemento()
22         {
23             return new Memento(state);
24         }
25 
26         public void SetMemento(Memento memento)
27         {
28             this.state = memento.State;
29         }
30 
31         public void Show()
32         {
33             Console.WriteLine("state=" + state);
34         }
35     }
36 }

 1 using System;
 2 
 3 namespace Memento
 4 {
 5     /// <summary> 
 6     /// 作者：bzyzhang
 7     /// 时间：2016/5/29 6:54:54 
 8     /// 博客地址：http://www.cnblogs.com/bzyzhang/
 9     /// Memento说明：本代码版权归bzyzhang所有，使用时必须带上bzyzhang博客地址 
10     /// </summary> 
11     public class Memento
12     {
13         private string state;
14 
15         public string State
16         {
17             get { return state; }
18         }
19 
20         public Memento(string state)
21         {
22             this.state = state;
23         }
24     }
25 }

 1 using System;
 2 
 3 namespace Memento
 4 {
 5     /// <summary> 
 6     /// 作者：bzyzhang
 7     /// 时间：2016/5/29 6:59:40 
 8     /// 博客地址：http://www.cnblogs.com/bzyzhang/
 9     /// Caretaker说明：本代码版权归bzyzhang所有，使用时必须带上bzyzhang博客地址 
10     /// </summary> 
11     public class Caretaker
12     {
13         private Memento memento;
14 
15         public Memento Memento
16         {
17             get { return memento; }
18             set { memento = value; }
19         }
20     }
21 }

 1 namespace Memento
 2 {
 3     class Program
 4     {
 5         static void Main(string[] args)
 6         {
 7             Originator originator = new Originator();
 8             originator.State = "On";
 9             originator.Show();
10 
11             Caretaker caretaker = new Caretaker();
12             caretaker.Memento = originator.CreateMemento();
13 
14             originator.State = "Off";
15             originator.Show();
16 
17             originator.SetMemento(caretaker.Memento);
18             originator.Show();
19         }
20     }
21 }