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
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]
