事件是C#中一個重要的內容,MSDN上有一個自定義事件的演示示例。我看了半天有點暈,所以新建了一個winform工程添加了一個按鈕,然後找出調用的程序,一對比做了一個類似的示例,就明白了。看代碼有時候比看文檔來得更快。
所以還是一貫的原則,來乾的,不來稀的。
using System;
namespace TestEventArgs
{
/// <summary>
/// 這個類對應於EventArgs,做對比學習。
/// 添加兩個內容: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按鈕
/// </summary>
public class MyButton
{
public delegate void MyEvnetHandler(object sender, MyEventArgs e);
/// <summary>
/// 按鈕點擊的次數計數器
/// </summary>
public static UInt32 clicked_num = 0;
public event MyEvnetHandler MyClick;
public void 觸發()
{
MyEventArgs arg = new MyEventArgs(DateTime.UtcNow.ToString(), ++clicked_num);
MyClick(this, arg);
}
}
/// <summary>
/// 仿真Form窗體
/// </summary>
public class MyForm
{
public MyButton 按鈕;
public MyForm()
{
按鈕 = new MyButton();
按鈕.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 窗體 = new MyForm();
for (int i = 0; i < 10; i++ )
{
窗體.按鈕.觸發();
System.Threading.Thread.Sleep(500);
}
Console.WriteLine("Press any key to continue...");
Console.ReadKey();
}
}
}
不同的地方:
1 本示例中delegate myevnethandler是mybutton類內部成員,在系統中eventhander是system命名空間下的一個成員。