C#设计模式-- 外观模式(Facade Pattern)
介绍为子系统中的一组接口提供一个一致的界面，Facade模式定义了一个高层接口，这个接口使得这一子系统更加容易使用。
示例
有一个Message实体类，某对象对它的操作有Get()方法，另外还有一个对象有一个Validate()方法来判断用户是否有权限。现在提供一个高层接口来封装这两个方法。
http://images.cnblogs.com/cnblogs_com/webabcd/82667/o_Facade.png
MessageModel
http://www.cnblogs.com/Images/OutliningIndicators/None.gifusing System;
http://www.cnblogs.com/Images/OutliningIndicators/None.gifusing System.Collections.Generic;
http://www.cnblogs.com/Images/OutliningIndicators/None.gifusing System.Text;
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
http://www.cnblogs.com/Images/OutliningIndicators/None.gifnamespace Pattern.Facade
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gifhttp://www.cnblogs.com/Images/dot.gif{
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif /**//// <summary>
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif /// Message实体类
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif /// </summary>
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif public class MessageModel
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif http://www.cnblogs.com/Images/dot.gif{
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif /**//// <summary>
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif /// 构造函数
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif /// </summary>
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif /// <param name="msg">Message内容</param>
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif /// <param name="pt">Message发布时间</param>
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif public MessageModel(string msg, DateTime pt)
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif http://www.cnblogs.com/Images/dot.gif{
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif this._message = msg;
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif this._publishTime = pt;
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif }
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif private string _message;
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif /**//// <summary>
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif /// Message内容
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif /// </summary>
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif public string Message
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif http://www.cnblogs.com/Images/dot.gif{
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif get http://www.cnblogs.com/Images/dot.gif{ return _message; }
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif set http://www.cnblogs.com/Images/dot.gif{ _message = value; }
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif }
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif private DateTime _publishTime;
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif /**//// <summary>
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif /// Message发布时间
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif /// </summary>
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif public DateTime PublishTime
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif http://www.cnblogs.com/Images/dot.gif{
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif get http://www.cnblogs.com/Images/dot.gif{ return _publishTime; }
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif set http://www.cnblogs.com/Images/dot.gif{ _publishTime = value; }
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif }
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif }
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif}
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
User
http://www.cnblogs.com/Images/OutliningIndicators/None.gifusing System;
http://www.cnblogs.com/Images/OutliningIndicators/None.gifusing System.Collections.Generic;
http://www.cnblogs.com/Images/OutliningIndicators/None.gifusing System.Text;
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
http://www.cnblogs.com/Images/OutliningIndicators/None.gifnamespace Pattern.Facade
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gifhttp://www.cnblogs.com/Images/dot.gif{
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif /**//// <summary>
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif /// 用户相关类
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif /// </summary>
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif public class User
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif http://www.cnblogs.com/Images/dot.gif{
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif /**//// <summary>
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif /// 验证用户是否合法
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif /// </summary>
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif /// <param name="userId">UserId</param>
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif /// <returns></returns>
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif public bool Validate(string userId)
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif http://www.cnblogs.com/Images/dot.gif{
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif if (userId == "admin")
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif http://www.cnblogs.com/Images/dot.gif{
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif return true;
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif }
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif else
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif http://www.cnblogs.com/Images/dot.gif{
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif return false;
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif }
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif }
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif }
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif}
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
SqlMessage
http://www.cnblogs.com/Images/OutliningIndicators/None.gifusing System;
http://www.cnblogs.com/Images/OutliningIndicators/None.gifusing System.Collections.Generic;
http://www.cnblogs.com/Images/OutliningIndicators/None.gifusing System.Text;
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
http://www.cnblogs.com/Images/OutliningIndicators/None.gifnamespace Pattern.Facade
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gifhttp://www.cnblogs.com/Images/dot.gif{
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif /**//// <summary>
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif /// Sql方式操作Message
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif /// </summary>
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif public class SqlMessage
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif http://www.cnblogs.com/Images/dot.gif{
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif /**//// <summary>
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif /// 获取Message
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif /// </summary>
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif /// <returns></returns>
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif public List<MessageModel> Get()
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif http://www.cnblogs.com/Images/dot.gif{
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif List<MessageModel> l = new List<MessageModel>();
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif l.Add(new MessageModel("SQL方式获取Message", DateTime.Now));
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif return l;
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif }
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif }
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif}
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
Message
http://www.cnblogs.com/Images/OutliningIndicators/None.gifusing System;
http://www.cnblogs.com/Images/OutliningIndicators/None.gifusing System.Collections.Generic;
http://www.cnblogs.com/Images/OutliningIndicators/None.gifusing System.Text;
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
http://www.cnblogs.com/Images/OutliningIndicators/None.gifnamespace Pattern.Facade
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gifhttp://www.cnblogs.com/Images/dot.gif{
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif /**//// <summary>
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif /// Facade类
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif /// </summary>
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif public class Message
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif http://www.cnblogs.com/Images/dot.gif{
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif private string _userId = "";
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif /**//// <summary>
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif /// 构造函数
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif /// </summary>
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif /// <param name="userId">UserId</param>
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif public Message(string userId)
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif http://www.cnblogs.com/Images/dot.gif{
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif this._userId = userId;
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif }
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif /**//// <summary>
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif /// 获取Message
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif /// 首先使用User类的Validate()方法验证用户是否合法
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif /// 然后使用SqlMessage类的Get()方法获取Message
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif /// </summary>
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif /// <returns></returns>
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif public List<MessageModel> Get()
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif http://www.cnblogs.com/Images/dot.gif{
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif User u = new User();
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif SqlMessage m = new SqlMessage();
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif if (u.Validate(_userId))
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif http://www.cnblogs.com/Images/dot.gif{
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif return m.Get();
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif }
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif else
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif http://www.cnblogs.com/Images/dot.gif{
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif List<MessageModel> l = new List<MessageModel>();
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif l.Add(new MessageModel("无权获取", DateTime.Now));
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif return l;
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif }
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif }
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif }
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif}
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
client
http://www.cnblogs.com/Images/OutliningIndicators/None.gifusing System;
http://www.cnblogs.com/Images/OutliningIndicators/None.gifusing System.Data;
http://www.cnblogs.com/Images/OutliningIndicators/None.gifusing System.Configuration;
http://www.cnblogs.com/Images/OutliningIndicators/None.gifusing System.Collections;
http://www.cnblogs.com/Images/OutliningIndicators/None.gifusing System.Web;
http://www.cnblogs.com/Images/OutliningIndicators/None.gifusing System.Web.Security;
http://www.cnblogs.com/Images/OutliningIndicators/None.gifusing System.Web.UI;
http://www.cnblogs.com/Images/OutliningIndicators/None.gifusing System.Web.UI.WebControls;
http://www.cnblogs.com/Images/OutliningIndicators/None.gifusing System.Web.UI.WebControls.WebParts;
http://www.cnblogs.com/Images/OutliningIndicators/None.gifusing System.Web.UI.HtmlControls;
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
http://www.cnblogs.com/Images/OutliningIndicators/None.gifusing Pattern.Facade;
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
http://www.cnblogs.com/Images/OutliningIndicators/None.gifpublic partial class Facade : System.Web.UI.Page
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gifhttp://www.cnblogs.com/Images/dot.gif{
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif protected void Page_Load(object sender, EventArgs e)
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif http://www.cnblogs.com/Images/dot.gif{
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif Message m = new Message("user");
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif Response.Write(m.Get().Message + " " + m.Get().PublishTime.ToString());
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif Response.Write("<br />");
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif m = new Message("admin");
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif Response.Write(m.Get().Message + " " + m.Get().PublishTime.ToString());
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif Response.Write("<br />");
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif }
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif}
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
运行结果
无权获取 2007-3-20 22:16:50
SQL方式获取Message 2007-3-20 22:16:50
参考
http://www.dofactory.com/Patterns/PatternFacade.aspx
OK
[源码下载]
C#设计模式导航：
C#设计模式--文章索引
C#设计模式--抽象工厂模式(Abstract Factory Pattern)
C#设计模式--原型模式(Prototype Pattern)
C#设计模式--工厂方法模式(Factory Method Pattern)
C#设计模式--单例模式(Singleton Pattern)
C#设计模式--适配器模式(Adapter Pattern)
C#设计模式--桥接模式(Bridge Pattern)
C#设计模式--组合模式(Composite Pattern)
C#设计模式--装饰模式(Decorator Pattern)
C#设计模式--外观模式(Facade Pattern)
C#设计模式--享元模式(Flyweight Pattern)
C#设计模式--代理模式(Proxy Pattern)
C#设计模式--责任链模式(Chain of Responsibility Pattern)
C#设计模式--命令模式(Command Pattern)
C#设计模式--解释器模式(Interpreter Pattern)
C#设计模式--迭代器模式(Iterator Pattern)
C#设计模式--中介者模式(Mediator Pattern)
C#设计模式--备忘录模式(Memento Pattern)
C#设计模式--观察者模式(Observer Pattern)
C#设计模式--状态模式(State Pattern)
C#设计模式--策略模式(Strategy Pattern)
C#设计模式--模板方法模式(Template Method Pattern)
C#设计模式--访问者模式(Visitor Pattern)
C#设计模式--提供者模式(Provider Pattern)
本文摘自：http://www.cnblogs.com/webabcd/archive/2007/03/20/681793.html
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