static void Main(string[] args) { Handler h1 = new Level1Handler("部门组长"); Handler h2 = new Level2Handler("部门经理"); Handler h3 = new Level3Handler("Boss"); h1.SetNextHandler(h2); h2.SetNextHandler(h3); h1.Handle(2); h1.Handle(4); h1.Handle(9); h1.Handle(10); Console.ReadLine(); }