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<p style="FONT-SIZE: 10pt">工厂模式专门负责将大量有共同接口的类实例化。工厂模式可以动态决定将哪一个类实例化，不必事先知道每次要实例化哪一个类。工厂模式有以下几种形态：
- 简单工厂（Simple Factory）模式
- 工厂方法（Factory Method）模式
- 抽象工厂（Abstract Factory）模式
一、 简单工厂（Simple Factory）模式
父类和公共的方法。
二、 Simple Factory模式角色与结构：
方法）创建产品对象。抽象产品角色Product (Light)：定义简单工厂创建的对象的父类或它们共同拥有的接口。可以是一个类、抽象类或接口。具体产品角色ConcreteProduct (BulbLight,TubeLight)：定义工厂具体加工出的对象。
三、 程序举例：
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四、 Simple Factory模式演化
用法外，在有些情况下Simple Factory可以由抽象产品角色扮演，一个抽象产品类同时是子类的工厂。
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五、 优点与缺点：
添加新产品就不得不修改工厂逻辑，有可能造成工厂逻辑过于复杂。
方法，这使得无法由子类继承，造成工厂角色无法形成基于继承的等级结构。
Box,Chris Sells，《.NET本质论 第1卷：公共语言运行库》，中国电力出版社
