設計模式－簡單工廠模式（SimpleFactory-C#) 選擇自 ClampHammer 的 Blog

 

參考資料

《java與模式》

上面那本書上的例子舉的是園丁和果園的例子，學習設計模式最好在生活中自己找個例子

實踐一下，下面是我自己的一個例子，是講快餐店的例子，快餐店提供很多食物，比如

麪條，米飯，麪包。首先定義了一個Food接口，然後這些食物都從它來繼承，定義了一個大廚

他包辦所有食物的製作工作，這就是我所理解的簡單工廠模式的概念，下面是源代碼：

 

using System;

namespace SimpleFactoryPattern
{
 /// <summary>
 /// 簡單工廠模式示例
 /// </summary>
 class SimpleFactoryPattern
 {
  //定義Food接口
   public interface Food
   {
         //烹飪
         void Cook();
         //賣出
         void Sell();

   }

  //Noodle

  public class Noodle:Food
  {
           public  Noodle()
           {
            Console.WriteLine("/nThe Noodle is made..");
           }
           private int price;
   
           //麪條Noodle的Cook方法接口實現
           public void Cook()
           {
            Console.WriteLine("/nNoodle is cooking...");
           }

           //麪條Noodle的Sell方法接口實現
           public void Sell()
           {
            Console.WriteLine("/nNoodle has been sold...");
           }
           public int Price
           {
            get{return this.price;}
            set{price=value;}
           }
  }

  //Rice
  public class Rice:Food
  {
           public Rice()
           {
            Console.WriteLine("/nThe Rice is made ..");
           }
           private int price;
           public void Cook()
           {
            Console.WriteLine("/nRice is cooking...");
           }
           public void Sell()
           {
            Console.WriteLine("/nRice has been sold...");
           }
           public int Price
           {
            get{return this.price;}
            set{price=value;}
           }
  }

 

    //Bread
  public class Bread:Food
  {
           public Bread()
           {
            Console.WriteLine("/nThe Bread is made....");
           }
           private int price;
           public void Cook()
           {
            Console.WriteLine("/nBread is cooking...");
           }
           public void Sell()
           {
            Console.WriteLine("/nBread has been sold...");
           }
           public int Price
           {
            get{return this.price;}
            set{price=value;}
           }
  }
 

 //定義大廚，他包辦這個快餐店裏的所有Food,包括麪條，麪包和米飯
  class Chef
  {
           public static Food MakeFood(string foodName)
           {
                    try
                    {
                             switch(foodName)
                             {
                                  case "noodle": return new Noodle();
                                  case "rice":return new Rice();
                                  case "bread":return new Bread();
                                  default:throw new BadFoodException("Bad food request!");
                             }
                    }
                    catch(BadFoodException e)
                    {
                             throw e;
                    }
   }
   
  }

  //異常類，該餐館沒有的食品
  class BadFoodException: System.Exception
  {
            public BadFoodException(string strMsg)
           {
                Console.WriteLine(strMsg);
           }
  }

  /// <summary>
  /// 應用程序的主入口點。
  /// </summary>
  [STAThread]
  static void Main(string[] args)
  {
           Food food=Chef.MakeFood("bread");
           food.Cook();
           food.Sell();
           Console.ReadLine();
  }
 }
}