外观模式(Facade Pattern)

外观模式(Facade Pattern)

1.jpg.png

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。



MessageModel

http://www.cnblogs.com/Images/OutliningIndicators/None.gifusing System;
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
using System.Collections.Generic;
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
using System.Text;
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
namespace Pattern.Facade
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif{
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.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.gif    {
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.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.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.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.gif        {
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif            
get { return _message; }
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif            
set { _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.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.gif        {
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif            
get { return _publishTime; }
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif            
set { _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.gif
using System.Collections.Generic;
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
using System.Text;
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
namespace Pattern.Facade
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif{
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.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.gif    {
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.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.gif        {
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif            
if (userId == "admin")
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.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.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.gif
using System.Collections.Generic;
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
using System.Text;
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
namespace Pattern.Facade
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif{
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.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.gif    {
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.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.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.gif
using System.Collections.Generic;
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
using System.Text;
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
namespace Pattern.Facade
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif{
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif    
/// <summary>
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif    
/// Facade
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.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.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.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.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.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.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.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.gif
using System.Data;
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
using System.Configuration;
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
using System.Collections;
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
using System.Web;
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
using System.Web.Security;
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
using System.Web.UI;
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
using System.Web.UI.WebControls;
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
using System.Web.UI.WebControls.WebParts;
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
using System.Web.UI.HtmlControls;
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
using Pattern.Facade;
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
public partial class Facade : System.Web.UI.Page
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif{
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif    
protected void Page_Load(object sender, EventArgs e)
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.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()[0].Message + " " + m.Get()[0].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()[0].Message + " " + m.Get()[0].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