知识点一：基本概念

知识点二：基本实现 

 #region 知识点二基本实现
 class GameObject
 {

 }

 class Player : GameObject
 {
     public void PlayerAtk()
     {
         Console.WriteLine("玩家攻击");
     }
 }

 class Monster : GameObject
 {
     public void PlayerAtk()
     {
         Console.WriteLine("怪物攻击");
     }
 }

 class Boss : GameObject
 {
     public void PlayerAtk()
     {
         Console.WriteLine("Boss攻击");
     }
 }
 #endregion
 internal class Program
 {
     static void Main(string[] args)
     {
         //里氏替换原则 用父类容器  装载子类对象
         GameObject player=new Player();
         GameObject monster=new Monster();
         GameObject boss=new Boss();

         GameObject[] objects=new GameObject[] {new Player(),new Monster(),new Boss()};

知识点三：is和as 

总结 ：