C#事件

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

namespace 事件练习
{
    /// <summary>
    /// 定义传入事件的参数
    /// </summary>
    public class NetWorkEventArgs : EventArgs
    {
        public string stream = "";
    }
    /// <summary>
    /// 定义事件发送者
    /// </summary>
    public class NetworkManager
    {
        //定义事件与对应的处理委托
        public delegate void ProcessNetWork(object sender, NetWorkEventArgs args);
        public event ProcessNetWork DownloadEvent;
        /// <summary>
        /// 将消息绑定到事件，发送消息
        /// </summary>
        public void DownloadComplete()
        {
            NetWorkEventArgs args = new NetWorkEventArgs();
            args.stream = "Success";
            DownloadEvent(this, args);
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            NetworkManager manager = new NetworkManager();
            //将处理方法绑定到委托，开始监听是否触发事件
            manager.DownloadEvent += manager_DownloadEvent;
            //触发事件
            manager.DownloadComplete();
        }
        /// <summary>
        /// 事件触发后，用于处理事件的方法
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="args"></param>
        static void manager_DownloadEvent(object sender, NetWorkEventArgs args)
        {
            Console.WriteLine(args.stream);
            Console.ReadKey();
        }
    }
}