向WinForms添加事件？ [英] Adding Events To WinForms?

问题描述

我在WinForm上有一个 TextBox ，每次有人按下该文本框内的一个键时，我想执行一些代码。我正在查看事件属性菜单，并看到 KeyDown 事件，但不知道如何向其添加代码。

I have a TextBox on a WinForm and I want to execute some code every time someone presses a key inside of that TextBox. I'm looking at the events properties menu, and see the KeyDown event, but don't know how to add code to it.

推荐答案

您需要为该事件添加事件处理程序。因此，在属性菜单中，双击KeyDown事件旁边的字段，Visual Studio将为您创建一个事件处理程序。它将如下所示：

You need to add an event handler for that event. So in the properties menu, double-click on the field beside the KeyDown event and Visual Studio will create an event handler for you. It'll look something like this:

private void textBox1_KeyDown(object sender, KeyEventArgs e)
{
    // enter your code here
}

您也可以自己订阅活动，而无需使用属性窗口。例如，在窗体的构造函数中：

You can also subscribe to events yourself without using the Properties window. For example, in the form's constructor:

textBox1.KeyDown += HandleTextBoxKeyDownEvent;

然后实现事件处理程序：

And then implement the event handler:

private void HandleTextBoxKeyDownEvent(object sender, KeyEventArgs e)
{
    // enter your code here
}

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