设计模式(C#) - 抽象工厂模式(Abstract Factory Pattern)
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
