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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转载于:https://blog.51cto.com/webabcd/344482