工厂方法模式（Factory Method）：
定义：Define an interface for creating an object, but let subclasses decide which class to instantiate. Factory Method lets a class defer instantiation to subclasses(定义一个用于创建对象的接口，让子类决定实例化哪一个类。 工厂方法使一个类的实例化延迟到其子类)。
在工厂方法模式中，抽象类Product负责定义产品的共性，实现对事物最抽象的定义；Creator为抽象创造类
/// <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();
}
}
原文：http://www.cnblogs.com/Zander-1349547081/p/6307625.html