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

using System.Threading;

namespace ConsoleTest
{

    public delegate void EventHandler(string sInfo);

    class Class1
    {
        public event EventHandler EventHandleTest;

        public void Start()
        {
            if (EventHandleTest != null)
            {
                Thread.Sleep(1000);
                EventHandleTest("完成进度20%");
                Thread.Sleep(1000);
                EventHandleTest("完成进度40%");
                Thread.Sleep(1000);
                EventHandleTest("完成进度60%");
                Thread.Sleep(1000);
                EventHandleTest("完成进度80%");
                Thread.Sleep(1000);
                EventHandleTest("完成进度100%");
            }
        }
    }

    class customEvent
    {
        static void Main()
        {
            Class1 c = new Class1();
            c.EventHandleTest +=new EventHandler(c_EventHandleTest);
            c.Start();
            Console.ReadLine();
        }

        public static void c_EventHandleTest(string sInfo)
        {
            Console.WriteLine(sInfo);
        }

    }
}

运行结果：

event 自定义事件一例_null