08-工厂方法

1. 简介

　　工厂方法：符合依赖倒置原则、单一职责、开闭原则。

　　与简单工厂的区别：简单工厂是在一个工厂里生成多个不同的类，而工厂方法是一个对象对应一个生成工厂，这些工厂都实现了一个共同的接口IFactory，很好的符合了依赖倒置原则、单一职责、开闭原则，每个工厂只负责创建对象。

2. 核心代码

1   public interface IFactory
2     {
3         IPeople CreateInstance();
4     }

1   public class ChineseFactory : IFactory
2     {
3         public IPeople CreateInstance()
4         {
5             return new Chinese();
6         }
7     }

1   public class JanpaneseFactory : IFactory
2     {
3         public IPeople CreateInstance()
4         {
5             return new Janpanese();
6         }
7     }

1  public class AmericaFactory : IFactory
2     {
3         public IPeople CreateInstance()
4         {
5             return new America();
6         }
7     }

 1 static void Main(string[] args)
 2         {
 3             IFactory iFactory1 = new ChineseFactory();
 4             IFactory iFactory2 = new AmericaFactory();
 5             IFactory iFactory3 = new JanpaneseFactory();
 6 
 7             IPeople iPeople1 = iFactory1.CreateInstance();
 8             IPeople iPeople2 = iFactory2.CreateInstance();
 9             IPeople iPeople3 = iFactory3.CreateInstance();
10 
11 
12             iPeople1.Eating();
13             iPeople2.Eating();
14             iPeople3.Eating();
15 
16             Console.ReadKey();
17 
18         }