c# 事件学习

以下是带事件数据的事件：

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

namespace ConApp_2_Event
{
    class Program
    {
        static void Main(string[] args)
        {
            RequestKey rk = new RequestKey();
            rk.OnReqKey += new RequestKey.ReqKey(rk_OnReqKey);
            rk.Run();
        }
        static void rk_OnReqKey(object sender, RequestKeyEventArgs rkea)
        {
            Console.WriteLine("您输入了<{0}>", rkea.InputText);
        }
    }
    public class RequestKeyEventArgs : EventArgs
    {
        public string InputText { get; set; }
    }
    public class RequestKey
    {
        public delegate void ReqKey(object sender, RequestKeyEventArgs rkea);
        public event ReqKey OnReqKey;
        public void Run()
        {
            while (true)
            {
                string a = Console.ReadLine();
                RequestKeyEventArgs re = new RequestKeyEventArgs();
                re.InputText = a;
                OnReqKey(this, re);
            }
        }
    }
}

上面的多了一个RequestKeyEventArgs类，此类继承了EventArgs类，就是通过这个类传递了事件中的数据
下面是不带事件数据的事件：

 

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

namespace ConApp_1_Event
{
    class Program
    {
        static void Main(string[] args)
        {
            Program pro = new Program();
            SJR _sjr = new SJR();
            _sjr.OnRequest += new SJR.UsersRequest(pro.Pro_OnRequest);
            _sjr.Run();
        }
        private void Pro_OnRequest(object sender, EventArgs e)
        {
            Console.WriteLine("OnRequest事件触发了");
        }
    }
    public class SJR
    {
        public delegate void UsersRequest(object sender, EventArgs e);
        public event UsersRequest OnRequest;
        public void Run()
        {
            while (true)
            {
                if (Console.ReadLine() == "s")
                {
                    OnRequest(this, new EventArgs());
                }
            }
        }
    }
}