事件,使用.net自带委托EventHandler

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    public class BossDemo
    {
        public event EventHandler BossEvent; //定义.net自带的委托类型EventHandler的事件，不用自己再定义委托

        public void Onmsg(string msg)
        {
            if (BossEvent != null)
            {
                Console.WriteLine(msg);
             //触发事件，需要传入参数
                BossEvent(this,new EventArgs());
            }

        }
        static void Main(string[] args)
        {

            BossDemo b = new BossDemo();
            Worker w1 = new Worker("1");
            Worker w2 = new Worker("2");
            b.BossEvent += new EventHandler(w1.SendMessage);
            b.BossEvent += new EventHandler(w2.SendMessage);
            b.Onmsg("朋友你好今晚上加班");
            Console.WriteLine("---------------------------");
            Console.ReadKey();

        }
    }
    public class Worker
    {
        private string workerId;
        public Worker(string wi)
        {
            this.workerId = wi;

        }
 //该函数符合EventHandler的定义
        public void SendMessage(object o,EventArgs e)
        {
            Console.WriteLine(this.workerId + "卧槽又加班");
            Console.Read();
        }

    }
}