使用设计模式中的工厂方法模式进行C#编程的示例讲解

{
  /// <summary>
  /// 菜抽象类
  /// </summary>
  public abstract class Food
  {
    // 输出点了什么菜
    public abstract void Print();
  }
  /// <summary>
  /// 西红柿炒鸡蛋这道菜
  /// </summary>
  public class TomatoScrambledEggs : Food
  {
    public override void Print()
    {
      Console.WriteLine("西红柿炒蛋好了！");
    }
  }
  /// <summary>
  /// 土豆肉丝这道菜
  /// </summary>
  public class ShreddedPorkWithPotatoes : Food
  {
    public override void Print()
    {
      Console.WriteLine("土豆肉丝好了");
    }
  }
  /// <summary>
  /// 抽象工厂类
  /// </summary>
  public abstract class Creator
  {
    // 工厂方法
    public abstract Food CreateFoddFactory();
  }
  /// <summary>
  /// 西红柿炒蛋工厂类
  /// </summary>
  public class TomatoScrambledEggsFactory:Creator
  {
    /// <summary>
    /// 负责创建西红柿炒蛋这道菜
    /// </summary>
    /// <returns></returns>
    public override Food CreateFoddFactory()
    {
      return new TomatoScrambledEggs();
    }
  }
  /// <summary>
  /// 土豆肉丝工厂类
  /// </summary>
  public class ShreddedPorkWithPotatoesFactory:Creator
  {
    /// <summary>
    /// 负责创建土豆肉丝这道菜
    /// </summary>
    /// <returns></returns>
    public override Food CreateFoddFactory()
    {
      return new ShreddedPorkWithPotatoes();
    }
  }
  /// <summary>
  /// 客户端调用
  /// </summary>
  class Client
  {
    static void Main(string[] args)
    {
      // 初始化做菜的两个工厂（）
      Creator shreddedPorkWithPotatoesFactory = new ShreddedPorkWithPotatoesFactory();
      Creator tomatoScrambledEggsFactory = new TomatoScrambledEggsFactory();
      // 开始做西红柿炒蛋
      Food tomatoScrambleEggs = tomatoScrambledEggsFactory.CreateFoddFactory();
      tomatoScrambleEggs.Print();
      //开始做土豆肉丝
      Food shreddedPorkWithPotatoes = shreddedPorkWithPotatoesFactory.CreateFoddFactory();
      shreddedPorkWithPotatoes.Print();
      Console.Read();
    }
  }
}

/// <summary>
  /// 肉末茄子这道菜
  /// </summary>
  public class MincedMeatEggplant : Food
  {
    /// <summary>
    /// 重写抽象类中的方法
    /// </summary>
    public override void Print()
    {
      Console.WriteLine("肉末茄子好了");
    }
  }
 /// <summary>
  /// 肉末茄子工厂类，负责创建肉末茄子这道菜
  /// </summary>
  public class MincedMeatEggplantFactory : Creator
  {
    /// <summary>
    /// 负责创建肉末茄子这道菜
    /// </summary>
    /// <returns></returns>
    public override Food CreateFoddFactory()
    {
      return new MincedMeatEggplant();
    }
  }
  /// <summary>
  /// 客户端调用
  /// </summary>
  class Client
  {
    static void Main(string[] args)
    {
          
      // 如果客户又想点肉末茄子了
      // 再另外初始化一个肉末茄子工厂
      Creator minceMeatEggplantFactor = new MincedMeatEggplantFactory();
      // 利用肉末茄子工厂来创建肉末茄子这道菜
      Food minceMeatEggplant = minceMeatEggplantFactor.CreateFoddFactory();
      minceMeatEggplant.Print();
      Console.Read();
    }
  }

<httpHandlers>
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      <add path="*.aspx" verb="*" type="System.Web.UI.PageHandlerFactory" validate="True" />
      <add path="*.ashx" verb="*" type="System.Web.UI.SimpleHandlerFactory" validate="True" />
</httpHandlers>