using System;using System.Collections.Generic;using System.Text;namespace Pattern.Memento
{
/// <summary>
/// Message实体类（Memento）
/// </summary> public class MessageModel { /// <summary> /// 构造函数 /// </summary> /// <param name="msg">Message内容</param> /// <param name="pt">Message发布时间</param> public MessageModel(string msg, DateTime pt) { this._message = msg; this._publishTime = pt; } private string _message; /// <summary> /// Message内容 /// </summary> public string Message { get { return _message; } set { _message = value; } } private DateTime _publishTime; /// <summary> /// Message发布时间 /// </summary> public DateTime PublishTime { get { return _publishTime; } set { _publishTime = value; } } }
}using System;using System.Collections.Generic;using System.Text;namespace Pattern.Memento{ /// <summary> /// Memento管理者（Caretaker） /// </summary> public class MessageModelCaretaker { private MessageModel _messageModel; /// <summary> /// Message实体对象（Memento） /// </summary> public MessageModel MessageModel { get { return _messageModel; } set { _messageModel = value; } } }}using System;using System.Collections.Generic;using System.Text;namespace Pattern.Memento{ /// <summary> /// Sql方式操作Message（Originator） /// </summary> public class SqlMessage { private string _message; /// <summary> /// Message内容 /// </summary> public string Message { get { return _message; } set { _message = value; } } private DateTime _publishTime; /// <summary> /// Message发布时间 /// </summary> public DateTime PublishTime { get { return _publishTime; } set { _publishTime = value; } } /// <summary> /// 插入Message /// </summary> /// <param name="mm">Message实体对象</param> /// <returns></returns> public bool Insert(MessageModel mm) { // 秒数可以被5整除时，则执行插入操作 if (mm.PublishTime.Second % 5 == 0) { // 代码略 return true; } else { return false; } } /// <summary> /// 保存Memento /// </summary> /// <returns></returns> public MessageModel SaveMemento() { return new MessageModel(_message, _publishTime); } /// <summary> /// 恢复Memento /// </summary> /// <param name="mm"></param> public void RestoreMemento(MessageModel mm) { this._message = mm.Message; this._publishTime = mm.PublishTime; } }}using System;using System.Data;using System.Configuration;using System.Collections;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using Pattern.Memento;public partial class Memento : System.Web.UI.Page{ protected void Page_Load(object sender, EventArgs e) { SqlMessage m = new SqlMessage(); m.Message = "Message内容"; m.PublishTime = DateTime.Now; MessageModelCaretaker mmc = new MessageModelCaretaker(); mmc.MessageModel = m.SaveMemento(); bool bln = false; while (!bln) { bln = m.Insert(new MessageModel(m.Message, m.PublishTime)); Response.Write(m.Message + " " + m.PublishTime.ToString() + " " + bln.ToString()); Response.Write("<br />"); if (!bln) { System.Threading.Thread.Sleep(1000); m.RestoreMemento(mmc.MessageModel); m.PublishTime = DateTime.Now; } } }}乐在其中设计模式(C#) - 备忘录模式(Memento Pattern),布布扣,bubuko.com
乐在其中设计模式(C#) - 备忘录模式(Memento Pattern)
原文：http://www.cnblogs.com/lonelyxmas/p/3590359.html
