namespace 工厂方法
{
    class Program
    {
        static void Main(string[] args)
        {
            PeopleFactory peopleFactory = new PeopleFactory();
            People p= peopleFactory.CreatePeople();
            p.Say();
            Console.ReadKey();
        }
    }
}

 /// <summary>
    /// 优点：
    /// 1.延迟的对象的创建，可以加入一些逻辑
    /// 2.实现对修改封闭对新增开发。
    /// 
    /// 缺点：实现用途不大
    /// </summary>
    public class PeopleFactory
    {
        public People CreatePeople()
        {
            Console.WriteLine("创建人类做的其他事情。。。");
            return new People();
        }
    }

public class People
    {
        public void Say()
        {
            Console.WriteLine("人类说话了。。。");
        }
    }