装饰模式

class Program
    {
        static void Main(string[] args)
        {
            Trainee trainee = new Trainee("cxk");
            Finery finery0 = new Student();
            finery0.SetPerson(trainee);
            Finery finery1 = new BasketBall();
            finery1.SetPerson(finery0);
            finery1.Show();
        }
    }
    abstract class Person
    {
        public abstract void Show();
    }
    class Trainee : Person
    {
        protected string name;
        public Trainee(string name)
        {
            this.name = name;
        }
        public override void Show()
        {
            Console.WriteLine("我是"+name+"\n");
        }
    }
    abstract class Finery : Person
    {
        protected Person person;
        public void SetPerson(Person person)
        {
            this.person = person;
        }
        public override void Show()
        {
            if(person != null)
            {
                person.Show();
            }
        }
    }
    class Student : Finery
    {
        public override void Show()
        {
            base.Show();
            Console.WriteLine("I am student"+"\n");
        }
    }
    class BasketBall : Finery
    {
        public override void Show()
        {
            base.Show();
            Console.WriteLine("I am BasketBaller"+"\n");
        }
    }