WinForm中使用自定义事件

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

namespace ConsoleApplication8
{

class Program
{
static void Main(string[] args)
{

//第三步：定义对象并添加事件
Priter priter = new Priter();
priter.OnPrintComplete += new EventHandler<PrintCompleteEventArgs>(priter_OnPrintComplete);
for (int i = 0; i < 500; i++)
{

//第四步：执行实际方法
priter.Print(i);
System.Threading.Thread.Sleep(100);
}
}

static void priter_OnPrintComplete(object sender, PrintCompleteEventArgs e)
{

//第五步：处理回调函数
Console.WriteLine("完成打印:" + e.message);
if (e.message % 10 == 0)
Console.WriteLine("我是10的倍数," + e.message);
}
}

/// <summary>
/// 第二步：定义事件类
/// </summary>
public class Priter
{
/// <summary>
/// 用event关键字声明事件对象(如果EventHandler不够用，可先用delegate定义一个处理事件)
/// </summary>
public event EventHandler<PrintCompleteEventArgs> OnPrintComplete;

/// <summary>
/// 实际打印方法
/// </summary>
/// <param name="data"></param>
public void Print(int data)
{
//在这里执行打印操作..
//TO DO..
//..
Console.WriteLine("开始打印:"+data);

//执行完后通知执行外部的事件方法(如果是异步操作，可另外开一线程监听然后执行以下通知)
OnPrintComplete(this, new PrintCompleteEventArgs(data));
}
}

/// <summary>
/// 第一步：定义事件参数类
/// </summary>
public class PrintCompleteEventArgs : EventArgs
{
public int message;
public PrintCompleteEventArgs(int Message)
{
this.message = Message;
}
}
}

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namespace 事件
{
//发布事件的类
public class TestEventSource
{
//定义事件参数类
public class TestEventArgs : EventArgs
{
public readonly char KeyToRaiseEvent;
public TestEventArgs(char keyToRaiseEvent)
{
KeyToRaiseEvent = keyToRaiseEvent;
}
}

//定义delegate
public delegate void TestEventHandler(object sender, TestEventArgs e);
//用event 关键字声明事件对象
public event TestEventHandler TestEvent;

//事件触发方法
protected virtual void OnTestEvent(TestEventArgs e)
{
if (TestEvent != null)
TestEvent(this, e);
}

//引发事件
public void RaiseEvent(char keyToRaiseEvent)
{
TestEventArgs e = new TestEventArgs(keyToRaiseEvent);
OnTestEvent(e);
}

}
//监听事件的类
public class TestEventListener
{
//定义处理事件的方法，他与声明事件的delegate具有相同的参数和返回值类型
public void KeyPressed(object sender, TestEventSource.TestEventArgs e)
{
Console.WriteLine("发送者：{0}，所按得健为：{1}", sender, e.KeyToRaiseEvent);
}

//订阅事件
public void Subscribe(TestEventSource evenSource)
{
evenSource.TestEvent += new TestEventSource.TestEventHandler(KeyPressed);
}
//取消订阅事件
public void UnSubscribe(TestEventSource evenSource)
{
evenSource.TestEvent -= new TestEventSource.TestEventHandler(KeyPressed);
}
}

//测试类
public class Test
{
public static void Main()
{
//创建事件源对象
TestEventSource es = new TestEventSource();
//创建监听对象
TestEventListener el = new TestEventListener();
//订阅事件
Console.WriteLine("订阅事件\n");
el.Subscribe(es);
//引发事件
Console.WriteLine("输入一个字符，再按enter键");
string s = Console.ReadLine();
es.RaiseEvent(s.ToCharArray()[0]);
//取消订阅事件
Console.WriteLine("\n取消订阅事件\n");
el.UnSubscribe(es);

//引发事件
Console.WriteLine("输入一个字符，再按enter健");
s = Console.ReadLine();
es.RaiseEvent(s.ToCharArray()[0]);

}
}

}