简单工厂模式(Simple Factory Pattern)

又称为静态工厂方法(Static Factory Method)模式，属于类的创建型模式，通过它根据自变量的不同返回不同的类的实例。

简单工厂模式专门定义一个类来负责创建其它类的实例，被创建的实例通常都具有共同的父类

模式结构：

abstract class MobilePhone
    {
        public abstract void Call(); 
        public abstract void SendMSG(); 
}
    class Iphone4S : MobilePhone
    {
        public override void Call()
        {
            Console.WriteLine("用Iphone4S打电话");
        }
        public override void SendMSG()
        {
            Console.WriteLine("用Iphone4S发短信");
        }
}
    class GalaxyNote2 : MobilePhone
    {
        public override void Call()
        {
            Console.WriteLine("用GalaxyNote2打电话");
        }
        public override void SendMSG()
        {
            Console.WriteLine("用GalaxyNote2发短信");
        }
}

class SimpleFactory
    {
        static MobilePhone ph;
        public static MobilePhone CreatePhone(string phonename)
        {
            switch (phonename)
            {
                case "Iphone4S":
                    ph = new Iphone4S(); 
                    break;
                case "GalaxyNote2":
                    ph = new GalaxyNote2();
                    break;
                case "HTCOneM7":
                    ph = new HTCOneM7();
                    break;
                default:
                    break;
            }
            return ph;
        }

class Program
    {
        static void Main(string[] args)
        {
            MobilePhone ph;
            ph = SimpleFactory.CreatePhone("Iphone4S"); 
            ph.Call();
            ph.SendMSG();
 
            Console.ReadKey();
        }
}