乐在其中设计模式(C#) - 抽象工厂模式(Abstract Factory Pattern)

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乐在其中设计模式(C#) - 抽象工厂模式(Abstract Factory Pattern)

作者： webabcd


介绍
提供一个创建一系列相关或相互依赖对象的接口，而无需指定它们具体的类。


示例
有Message和MessageModel，Message有一个Insert()方法，该方法的参数是MessageModel。

AbstractMessageModel

using System; 
using System.Collections.Generic; 
using System.Text; 
 
namespace Pattern.AbstractFactory 
{ 
         /// <summary> 
         /// 抽象Message实体类（AbstractProduct） 
         /// </summary> 
         public  abstract  class AbstractMessageModel 
        { 
                 /// <summary> 
                 /// 构造函数 
                 /// </summary> 
                 public AbstractMessageModel() 
                { 
 
                } 
 
                 /// <summary> 
                 /// 构造函数 
                 /// </summary> 
                 /// <param name="msg">Message内容</param> 
                 /// <param name="pt">Message发布时间</param> 
                 public AbstractMessageModel( 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; } 
                } 
 
                 /// <summary> 
                 /// UserId 
                 /// </summary> 
                 public  abstract  string UserId 
                { 
                        get; 
                        set; 
                } 
        } 
}

 

SqlMessageModel

using System; 
using System.Collections.Generic; 
using System.Text; 
 
namespace Pattern.AbstractFactory 
{ 
         /// <summary> 
         /// SqlMessage实体类（Product） 
         /// </summary> 
         public  class SqlMessageModel : AbstractMessageModel 
        { 
                 /// <summary> 
                 /// 构造函数 
                 /// </summary> 
                 public SqlMessageModel() 
                        :  base() 
                { 
 
                } 
 
                 /// <summary> 
                 /// 构造函数 
                 /// </summary> 
                 /// <param name="userId">UserId</param> 
                 /// <param name="msg">Message内容</param> 
                 /// <param name="pt">Message发布时间</param> 
                 public SqlMessageModel( string userId,  string msg, DateTime pt) 
                        :  base(msg, pt) 
                { 
                         this._userId = userId; 
                } 
 
                 private  string _userId; 
                 /// <summary> 
                 /// Message内容 
                 /// </summary> 
                 public  override  string UserId 
                { 
                        get {  return _userId; } 
                        set { _userId = value; } 
                } 
        } 
}

 

XmlMessageModel

using System; 
using System.Collections.Generic; 
using System.Text; 
 
namespace Pattern.AbstractFactory 
{ 
         /// <summary> 
         /// XmlMessage实体类（Product） 
         /// </summary> 
         public  class XmlMessageModel : AbstractMessageModel 
        { 
                 /// <summary> 
                 /// 构造函数 
                 /// </summary> 
                 public XmlMessageModel() 
                        :  base() 
                { 
 
                } 
 
                 /// <summary> 
                 /// 构造函数 
                 /// </summary> 
                 /// <param name="userId">UserId</param> 
                 /// <param name="msg">Message内容</param> 
                 /// <param name="pt">Message发布时间</param> 
                 public XmlMessageModel( string userId,  string msg, DateTime pt) 
                        :  base (msg, pt) 
                { 
                         this._userId = userId; 
                } 
 
                 private  string _userId; 
                 /// <summary> 
                 /// Message内容 
                 /// </summary> 
                 public  override  string UserId 
                { 
                         // 解密算法后的值 
                        get {  return _userId; }    
 
                         // 加密算法后的值 
                        set { _userId = value; } 
                } 
        } 
}

 

AbstractMessage

using System; 
using System.Collections.Generic; 
using System.Text; 
 
namespace Pattern.AbstractFactory 
{ 
         /// <summary> 
         /// 操作Message抽象类（AbstractProduct） 
         /// </summary> 
         public  abstract  class AbstractMessage 
        { 
                 /// <summary> 
                 /// 插入Message 
                 /// </summary> 
                 /// <param name="amm">AbstractMessageModel</param> 
                 /// <returns></returns> 
                 public  abstract  string Insert(AbstractMessageModel amm); 
        } 
}

 

SqlMessage

using System; 
using System.Collections.Generic; 
using System.Text; 
 
namespace Pattern.AbstractFactory 
{ 
         /// <summary> 
         /// Sql方式操作Message类（Product） 
         /// </summary> 
         public  class SqlMessage : AbstractMessage 
        { 
                 /// <summary> 
                 /// 插入Message 
                 /// </summary> 
                 /// <param name="amm">AbstractMessageModel</param> 
                 /// <returns></returns> 
                 public  override  string Insert(AbstractMessageModel amm) 
                { 
                         return  "Sql方式插入Message。帐号：" + amm.UserId    
                                +  "；内容：" + amm.Message    
                                +  "；时间：" + amm.PublishTime.ToString(); 
                } 
        } 
}

 

XmlMessage

using System; 
using System.Collections.Generic; 
using System.Text; 
 
namespace Pattern.AbstractFactory 
{ 
         /// <summary> 
         /// Xml方式操作Message类（Product） 
         /// </summary> 
         public  class XmlMessage : AbstractMessage 
        { 
                 /// <summary> 
                 /// 插入Message 
                 /// </summary> 
                 /// <param name="amm">AbstractMessageModel</param> 
                 /// <returns></returns> 
                 public  override  string Insert(AbstractMessageModel amm) 
                { 
                         return  "Xml方式插入Message。帐号：" + amm.UserId 
                                +  "；内容：" + amm.Message 
                                +  "；时间：" + amm.PublishTime.ToString(); 
                } 
        } 
}

 

AbstractMessageFactory

using System; 
using System.Collections.Generic; 
using System.Text; 
 
namespace Pattern.AbstractFactory 
{ 
         /// <summary> 
         /// 抽象Message工厂（AbstractFactory） 
         /// </summary> 
         public  abstract  class AbstractMessageFactory 
        { 
                 /// <summary> 
                 /// 创建MessageModel对象 
                 /// </summary> 
                 /// <returns></returns> 
                 public  abstract AbstractMessageModel CreateMessageModel(); 
 
                 /// <summary> 
                 /// 创建Message对象 
                 /// </summary> 
                 /// <returns></returns> 
                 public  abstract AbstractMessage CreateMessage(); 
        } 
}

 

SqlMessageFactory

using System; 
using System.Collections.Generic; 
using System.Text; 
 
namespace Pattern.AbstractFactory 
{ 
         /// <summary> 
         /// SqlMessage工厂（ConcreteFactory） 
         /// </summary> 
         public  class SqlMessageFactory : AbstractMessageFactory 
        { 
                 /// <summary> 
                 /// 创建SqlMessageModel对象 
                 /// </summary> 
                 /// <returns></returns> 
                 public  override AbstractMessageModel CreateMessageModel() 
                { 
                         return  new SqlMessageModel(); 
                } 
 
                 /// <summary> 
                 /// 创建SqlMessage对象 
                 /// </summary> 
                 /// <returns></returns> 
                 public  override AbstractMessage CreateMessage() 
                { 
                         return  new SqlMessage(); 
                } 
        } 
}

 

XmlMessageFactory

using System; 
using System.Collections.Generic; 
using System.Text; 
 
namespace Pattern.AbstractFactory 
{ 
         /// <summary> 
         /// XmlMessage工厂（ConcreteFactory） 
         /// </summary> 
         public  class XmlMessageFactory : AbstractMessageFactory 
        { 
                 /// <summary> 
                 /// 创建XmlMessageModel对象 
                 /// </summary> 
                 /// <returns></returns> 
                 public  override AbstractMessageModel CreateMessageModel() 
                { 
                         return  new XmlMessageModel(); 
                } 
 
                 /// <summary> 
                 /// 创建XmlMessage对象 
                 /// </summary> 
                 /// <returns></returns> 
                 public  override AbstractMessage CreateMessage() 
                { 
                         return  new XmlMessage(); 
                } 
        } 
}

 

Message

using System; 
using System.Collections.Generic; 
using System.Text; 
 
namespace Pattern.AbstractFactory 
{ 
         /// <summary> 
         /// Context类 
         /// </summary> 
         public  class Message 
        { 
                 private AbstractMessage _insertMessage; 
                 private AbstractMessageModel _messageModel; 
 
                 /// <summary> 
                 /// 构造函数 
                 /// </summary> 
                 /// <param name="factory">AbstractMessageFactory</param> 
                 public Message(AbstractMessageFactory factory) 
                { 
                        DateTime pt = DateTime.Now; 
 
                        _insertMessage = factory.CreateMessage(); 
                        _messageModel = factory.CreateMessageModel(); 
 
                } 
 
                 /// <summary> 
                 /// 插入Message 
                 /// </summary> 
                 /// <param name="userId">UserId</param> 
                 /// <param name="msg">Message内容</param> 
                 /// <param name="pt">Message发布时间</param> 
                 /// <returns></returns> 
                 public  string Insert( string userId,  string msg, DateTime pt) 
                { 
                        _messageModel.UserId = userId; 
                        _messageModel.Message = msg; 
                        _messageModel.PublishTime = pt; 
 
                         return _insertMessage.Insert(_messageModel); 
                } 
        } 
}

 

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.AbstractFactory; 
 
public partial  class AbstractFactory : System.Web.UI.Page 
{ 
         protected  void Page_Load( object sender, EventArgs e) 
        { 
                AbstractMessageFactory amf =  new SqlMessageFactory(); 
 
                Message m =  new Message(amf); 
 
                Response.Write(m.Insert( "admin",  "Sql方式", DateTime.Now)); 
                Response.Write( "<br />"); 
 
                amf =  new XmlMessageFactory(); 
 
                m =  new Message(amf); 
 
                Response.Write(m.Insert( "user",  "Xml方式", DateTime.Now)); 
        } 
}

 

 

运行结果
Sql方式插入Message。帐号：admin；内容：Sql方式；时间：2007-5-3 22:04:56
Xml方式插入Message。帐号：user；内容：Xml方式；时间：2007-5-3 22:04:56 


参考
http://www.dofactory.com/Patterns/PatternAbstract.aspx


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     本文转自webabcd 51CTO博客，原文链接： http://blog.51cto.com/webabcd/344482 ，如需转载请自行联系原作者