实例解析C#设计模式编程中简单工厂模式的使用

/// <summary>
  /// 自己做饭的情况
  /// 没有简单工厂之前，客户想吃什么菜只能自己炒的
  /// </summary>
  public class Customer
  {
    /// <summary>
    /// 烧菜方法
    /// </summary>
    /// <param name="type"></param>
    /// <returns></returns>
    public static Food Cook(string type)
    {
      Food food = null;
      // 客户A说：我想吃西红柿炒蛋怎么办？
      // 客户B说：那你就自己烧啊
      // 客户A说：好吧，那就自己做吧
      if (type.Equals("西红柿炒蛋"))
      {
        food = new TomatoScrambledEggs();
      }
      // 我又想吃土豆肉丝, 这个还是得自己做
      // 我觉得自己做好累哦，如果能有人帮我做就好了？
      else if (type.Equals("土豆肉丝"))
      {
        food = new ShreddedPorkWithPotatoes();
      }
      return food;
    }
    static void Main(string[] args)
    {
      // 做西红柿炒蛋
      Food food1 = Cook("西红柿炒蛋");
      food1.Print();
      Food food2 = Cook("土豆肉丝");
      food1.Print();
      Console.Read();
    }
  }
 /// <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("一份西红柿炒蛋！");
    }
  }
  /// <summary>
  /// 土豆肉丝这道菜
  /// </summary>
  public class ShreddedPorkWithPotatoes : Food
  {
    public override void Print()
    {
      Console.WriteLine("一份土豆肉丝");
    }
  }

/// <summary>
  /// 顾客充当客户端，负责调用简单工厂来生产对象
  /// 即客户点菜，厨师（相当于简单工厂）负责烧菜(生产的对象)
  /// </summary>
  class Customer
  {
    static void Main(string[] args)
    {
      // 客户想点一个西红柿炒蛋   
      Food food1 = FoodSimpleFactory.CreateFood("西红柿炒蛋");
      food1.Print();
      // 客户想点一个土豆肉丝
      Food food2 = FoodSimpleFactory.CreateFood("土豆肉丝");
      food2.Print();
      Console.Read();
    }
  }
  /// <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("一份西红柿炒蛋！");
    }
  }
  /// <summary>
  /// 土豆肉丝这道菜
  /// </summary>
  public class ShreddedPorkWithPotatoes : Food
  {
    public override void Print()
    {
      Console.WriteLine("一份土豆肉丝");
    }
  }
  /// <summary>
  /// 简单工厂类, 负责 炒菜
  /// </summary>
  public class FoodSimpleFactory
  {
    public static Food CreateFood(string type)
    {
      Food food = null;
      if (type.Equals("土豆肉丝"))
      {
        food= new ShreddedPorkWithPotatoes();
      }
      else if (type.Equals("西红柿炒蛋"))
      {
        food= new TomatoScrambledEggs();
      }
      return food;
    }
  }

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
/*简单工厂模式，工厂类返回一个子类对象*/
/*
 * 应用场景
 * 1,当工厂类负责创建的对象比较少时可以考虑使用简单工厂模式
 * 2，客户如果只知道传入工厂类的参数，对于如何创建对象的逻辑不关心时可以考虑使用简单工厂模式
*/
namespace 简单工厂模式
{
    //抽象一个娱乐场
    public abstract class Carnie
    {
        public abstract void GetTicket();
    }
    //具体到一个项目：海盗船
    public class PirateShip:Carnie
    {
        public override void GetTicket()
{
            Console.WriteLine("获取到了海盗船项目的门票！");
        }
    }
    //具体到一个项目：碰碰车
    public class Dodgems:Carnie
    {
        public override void GetTicket()
{
            Console.WriteLine("获取到了碰碰车项目的门票！");
        }
    }
 
    public class CarnieFactory
    {
        public static Carnie GetProject(string project)
{
            Carnie carnie=null;
            if(project=="海盗船")
            {
                carnie = new PirateShip();
            }
            else if(project=="碰碰车")
            {
                carnie = new Dodgems();
            }
            return carnie;
        }
    }
    class Program
    {
        public static Carnie GetProject(string project)
{
            Carnie carnie = null;
            if (project == "海盗船")
            {
                carnie = new PirateShip();
            }
            else if (project == "碰碰车")
            {
                carnie = new Dodgems();
            }
            return carnie;
        }
        static void Main(string[] args)
{
            Console.WriteLine("********不用简单工厂模式********");
            Carnie carnie = GetProject("碰碰车");
            carnie.GetTicket();
            carnie = GetProject("海盗船");
            carnie.GetTicket();
 
            Console.WriteLine("*********简单工厂模式********");
 
            carnie = CarnieFactory.GetProject("碰碰车");
            carnie.GetTicket();
            carnie = CarnieFactory.GetProject("海盗船");
            carnie.GetTicket();
 
         
            Console.ReadKey();
        }
    }
}