工厂方法模式(Factory Method Pattern)：定义一个用于创建对象的接口，让子类决定将哪一个类实例化。工厂方法模式让一个类的实例化延迟到其子类。工厂方法模式又简称为工厂模式(Factory Pattern)，又可称作虚拟构造器模式(Virtual Constructor Pattern)或多态工厂模式(Polymorphic Factory Pattern)。

模式角色与结构：

工厂方法模式是类的创建模式，其用意是定义一个创建产品对象的接口，将实际创建工作推迟到子类中。

示例代码：

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace CSharp.DesignPattern.FactoryMethodPattern{    class Program    {        static void Main(string[] args)        {            ICreator footballCreator = new FootballCreator(); // build factory            ICreator baseketballCreator = new BaseketballCreator(); // build factory            IAthlete footballAthlete = footballCreator.Create(); // build product            IAthlete basketballAthlete = baseketballCreator.Create(); // build product            footballAthlete.Run();            footballAthlete.Jump();            basketballAthlete.Run();            basketballAthlete.Jump();            Console.ReadLine();        }    }    // Product    interface IAthlete     {        void Run();        void Jump();    }    class FootballAthlete : IAthlete    {        public void Run()        {            Console.WriteLine("FootballAthlete Run...");        }        public void Jump()        {            Console.WriteLine("FootballAthlete Jump...");        }    }    class BaseketballAthlete : IAthlete    {        public void Run()        {            Console.WriteLine("BaseketballAthlete Run...");        }        public void Jump()        {            Console.WriteLine("BaseketballAthlete Jump...");        }    }    // Factory    interface ICreator     {        IAthlete Create();    }    // Concrete Factory    class BaseketballCreator : ICreator     {        public IAthlete Create()        {            return new BaseketballAthlete();        }    }    // Concrete Factory    class FootballCreator : ICreator     {        public IAthlete Create()        {            return new FootballAthlete();        }    }}