“对象发送者"的用途是什么?和"EventArgs e"参数? [英] What is the use of "object sender" and "EventArgs e" parameters?

问题描述

在Page_Load，Init和其他页面事件的情况下，这些(object sender, EventArgs e)参数的用途是什么?

In case of Page_Load, Init and other page events, what is the use of these (object sender, EventArgs e) parameters?

示例会更有用.

推荐答案

EventArgs e是一个名为e的参数，其中包含事件数据，有关更多信息，请参见EventArgs MSDN页面.

EventArgs e is a parameter called e that contains the event data, see the EventArgs MSDN page for more information.

Object Sender是一个名为Sender的参数，其中包含对引发事件的控件/对象的引用.

Object Sender is a parameter called Sender that contains a reference to the control/object that raised the event.

事件Arg类: http://msdn.microsoft.com/zh-CN/library/system.eventargs.aspx

示例:

protected void btn_Click (object sender, EventArgs e){
   Button btn = sender as Button;
   btn.Text = "clicked!";
}

单击Button后，将触发btn_Click事件处理程序. 对象发送者"部分将是对单击的按钮的引用

When Button is clicked, the btn_Click event handler will be fired. The "object sender" portion will be a reference to the button which was clicked

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