乐在其中设计模式(C#) - 代理模式(Proxy Pattern)

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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
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