C#事件与接口

using System;namespace ConsoleApplication1d
{delegate void MsgDel(string s);interface IMsg{event MsgDel msgd;void Excute(string s);}class MInfo : IMsg//必须实现接口的全部成员，如事件，函数
    {//不写这句会提示 Minfo does not implement interface memeber 'IMsg.msgd'
        public event MsgDel msgd; //这是对接口中事件的实现！，这里所谓的【实现】比较诡异， 仅仅是重新声明一次public void Excute(string s) //对接口中Excute的实现
        {if (null != msgd)msgd(s);}}class Test{public static void Main(){IMsg msg = new MInfo();msg.msgd += MSGA;msg.msgd += MSGB;msg.Excute("hello");//output// MSGA: hello // MSGB: hello
        }public static void MSGA(string s){Console.WriteLine("MSGA: " + s);}public static void MSGB(string s){Console.WriteLine("MSGB: " + s);}}
}