问题 C: C#委托、类和事件的验证

题目描述

程序由两部分组成，如下代码所示。第一部分定义了委托、类和事件。第二部分进行验证。 

using System;
namespace HelloWorldApplication
{
    public delegate void DelegateRing();
    public class Bell{
        public event DelegateRing Ring;
        public void OnRing(){ Ring(); }
    }
/////////////////////////////////////////////////////////////////
            
            请填写代码

/////////////////////////////////////////////////////////////////
    class HelloWorld
    {
        static void Main(string[] args)
        {
            try{
                Teacher teacher = new Teacher();
                teacher.Register(new Bell());
                Student student = new Student();
                student.Register(new Bell());
                Console.ReadKey();
            }
            catch(Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }
    }
}

输入

无输入

输出

验证事件输出

样例输入

.wrapper {position: relative;} #input {position: absolute;top: 0;left: 0;opacity: 0;z-index: -10;} copy

无

Made by hxl.

样例输出

teacher
student

提示

只需要输出样例输出的结果

只需要提交需要填写的代码

using System;
using System.Collections.Generic;
using System.Text;

namespace 委托_类和事件的验证
{
    public delegate void DelegateRing();
    public class Bell
    {
        public event DelegateRing Ring;
        public void OnRing() { Ring(); }
    }

    class Teacher
    {
        public void Register(Bell bell)
        {
            bell.Ring += new DelegateRing(HandleEvent);
            bell.OnRing();
        }
        public void HandleEvent()
        {
            Console.WriteLine("teacher");
        }
    }
    class Student
    {
        public void Register(Bell bell)
        {
            bell.Ring += new DelegateRing(HandleEvent2);
            bell.OnRing();
        }
        public void HandleEvent2()
        {
            Console.WriteLine("student");
        }
    }

    class HelloWorld
    {
        static void Main(string[] args)
        {
            try
            {
                Teacher teacher = new Teacher();
                teacher.Register(new Bell());
                Student student = new Student();
                student.Register(new Bell());
                Console.ReadKey();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }
    }
}