C#中实现自定义事件的代码演示

using System;
namespace TestEventArgs
{
    /// <summary>
    /// 这个类对应于EventArgs，做对比学习。
    /// 添加两个内容：info1，info2。
    /// </summary>
    public class MyEventArgs : EventArgs
    {
        private String info1;
        private UInt32 info2;

    public MyEventArgs(String info1, UInt32 info2)
    {
        this.info1 = info1;
        this.info2 = info2;
    }

    public String Info1
    {
        get { return this.info1; }
        set { this.info1 = value; }
    }

    public UInt32 Info2
    {
        get { return this.info2; }
        set { this.info2 = value; }
    }
}

/// <summary>
/// 仿真Button按钮
/// </summary>
public class MyButton
{
    public delegate void MyEvnetHandler(object sender, MyEventArgs e);
    /// <summary>
    /// 按钮点击的次数计数器
    /// </summary>
    public static UInt32 clicked_num = 0;
    public event MyEvnetHandler MyClick;

    public void 触发()
    {
        MyEventArgs arg = new MyEventArgs(DateTime.UtcNow.ToString(), ++clicked_num);
        MyClick(this, arg);
    }
}

/// <summary>
/// 仿真Form窗体
/// </summary>
public class MyForm
{
    public MyButton 按钮;
    public MyForm()
    {
        按钮 = new MyButton();
        按钮.MyClick += new MyButton.MyEvnetHandler(this.button_Clicked);
    }


    public void button_Clicked(object sender, MyEventArgs e)
    {
        Console.WriteLine("button clicked(sender is:" + sender.ToString() + "; info1 = "
            + e.Info1 + "; info2 = " + e.Info2);
    }
}

class Program
{
    static void Main(string[] args)
    {
        MyForm 窗体 = new MyForm();
        for (int i = 0; i < 10; i++ )
        {
            窗体.按钮.触发();
            System.Threading.Thread.Sleep(500);
        }
        Console.WriteLine("Press any key to continue...");
        Console.ReadKey();
    }
}

}</pre> 

 不同的地方：

 1 本示例中delegate myevnethandler是mybutton类内部成员，在系统中eventhander是system命名空间下的一个成员。