事件是C#中一个重要的内容,MSDN上有一个自定义事件的演示示例。我看了半天有点晕,所以新建了一个winform工程添加了一个按钮,然后找出调用的程序,一对比做了一个类似的示例,就明白了。看代码有时候比看文档来得更快。
代码语言:javascript复制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。