原文:
乐在其中设计模式(C#) - 代理模式(Proxy Pattern)
作者: webabcd
介绍
为其他对象提供一个代理以控制对这个对象的访问。
示例
有一个Message实体类,某对象对它的操作有Insert()和Get()方法,用一个代理来控制对这个对象的访问。
MessageModel
using
System;
using
System.Collections.Generic;
using
System.Text;

namespace
Pattern.Proxy

{

/// <summary>
/// Message实体类
/// </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; }
}
}
}
IMessage
using
System;
using
System.Collections.Generic;
using
System.Text;

namespace
Pattern.Proxy

{

/// <summary>
/// 对Message操作的接口
/// </summary>
public interface IMessage

{

/// <summary>
/// 获取Message
/// </summary>
/// <returns></returns>
List<MessageModel> Get();


/// <summary>
/// 插入Message
/// </summary>
/// <param name="mm">Message实体对象</param>
/// <returns></returns>
bool Insert(MessageModel mm);
}
}
SqlMessage
using
System;
using
System.Collections.Generic;
using
System.Text;

namespace
Pattern.Proxy

{

/// <summary>
/// Sql方式操作Message
/// </summary>
public class SqlMessage : IMessage

{

/// <summary>
/// 获取Message
/// </summary>
/// <returns></returns>
public List<MessageModel> Get()

{
List<MessageModel> l = new List<MessageModel>();
l.Add(new MessageModel("SQL方式获取Message", DateTime.Now));

return l;
}


/// <summary>
/// 插入Message
/// </summary>
/// <param name="mm">Message实体对象</param>
/// <returns></returns>
public bool Insert(MessageModel mm)

{
// 代码略
return true;
}
}
}
MessageProxy
using
System;
using
System.Collections.Generic;
using
System.Text;

namespace
Pattern.Proxy

{

/// <summary>
/// 代理类
/// </summary>
public class MessageProxy : IMessage

{
SqlMessage _sqlMessage;


/// <summary>
/// 构造函数
/// </summary>
public MessageProxy()

{
_sqlMessage = new SqlMessage();
}


/// <summary>
/// 获取Message
/// </summary>
/// <returns></returns>
public List<MessageModel> Get()

{
return _sqlMessage.Get();
}


/// <summary>
/// 插入Message
/// </summary>
/// <param name="mm">Message实体对象</param>
/// <returns></returns>
public bool Insert(MessageModel mm)

{
return _sqlMessage.Insert(mm);
}
}
}
client
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.Proxy;

public
partial
class
Proxy : System.Web.UI.Page

{
protected void Page_Load(object sender, EventArgs e)

{
MessageProxy m = new MessageProxy();
Response.Write(m.Insert(new MessageModel("插入", DateTime.Now)));
Response.Write("<br />");
Response.Write(m.Get()[0].Message + " " + m.Get()[0].PublishTime.ToString());
}
}
运行结果
True
SQL方式获取Message 2007-4-1 16:31:24
参考
http://www.dofactory.com/Patterns/PatternProxy.aspx
OK
[源码下载]
乐在其中设计模式(C#) - 代理模式(Proxy Pattern)
作者: webabcd
介绍
为其他对象提供一个代理以控制对这个对象的访问。
示例
有一个Message实体类,某对象对它的操作有Insert()和Get()方法,用一个代理来控制对这个对象的访问。

MessageModel

























































IMessage































SqlMessage











































MessageProxy



















































client


























运行结果
True
SQL方式获取Message 2007-4-1 16:31:24
参考
http://www.dofactory.com/Patterns/PatternProxy.aspx
OK
[源码下载]