继承和多态理解（C#）

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下面通过一个不同类型人（年轻人，老年人）来演示继承和多态的综合应用：
C# Code:
    abstract class PersonStyle    {               /// <summary>        /// 使用可见修饰符定义类成员，派生类将会继承它        /// </summary>       protected  string name;       protected string category;       public PersonStyle(string Name, string Category)        {            name = Name;            category = Category;                                }       /// <summary>       /// 返回一个字符串包括人员的信息       /// </summary>       /// <returns></returns>       public override string ToString()       {           string result = "Name:" + name + "\n";           result  +="Category:"+category+"\n";           return result;       }      /// <summary>      /// 定义一个抽象方法可以为不同人调用      /// </summary>      /// <returns></returns>       public abstract string Re();            }          class PersonMember    {        private PersonStyle[] personlist;        public PersonMember()        {                        //方法触发时引用指向的对象类型用来决定要触发哪个版本的方法            personlist = new PersonStyle[2];            personlist[0] = new OldPerson("steven", "老人");            personlist[1] = new NewPerson("wifi", "少年", "运动");        }        public void SayHello()        {            string login;            for (int count = 0; count < personlist.GetLength(0); count++)            {                Console.WriteLine(personlist[count]);                Console.WriteLine();                login=personlist[count].Re();                Console.WriteLine(login);            }                              }                }    class NewPerson:PersonStyle     {        private string hobby;        /// <summary>        /// base引用触发父类的构造函数        /// </summary>        /// <param name="Name"></param>        /// <param name="Category"></param>        public NewPerson(string Name, string Category,string Hobby)            :base(Name,Category  )        {            hobby =Hobby  ;        }        public override string ToString()        {            string result = base.ToString();            result += "Hobby:" + hobby;            return result;        }        /// <summary>        /// 通过继承间接引用私有方法！        /// </summary>        /// <returns></returns>        private string Sleeping()        {            return ("\n私有方法间接引用！");        }        public override  string Re()        {            return (Sleeping());        }            }    class OldPerson:PersonStyle     {                public OldPerson(string Name, string Category)            :base(Name,Category  )        {                     }                public override string Re()        {            return ("重写抽象方法！\n");        }               }        class Inheritance    {        static void Main(string[] args)        {            PersonMember myperson = new PersonMember();            myperson.SayHello();                                   Console.ReadKey();        }    }