" ESC"关闭申请的关键 [英] "ESC" key to close application

问题描述

我在C＃Visual Studio 2012中开发了一个Windows窗体应用程序。我想按ESC键关闭应用程序。我怀疑应该使用哪个按键事件？ Form_KeyPress或textBox_KeyPress？

I have developing an Windows Form application in C# Visual Studio 2012.I want to close the application by pressing "ESC" key.My doubt is which keypress event should I use? Form_KeyPress or textBox_KeyPress?

推荐答案

如果您将Form的'KeyPreview属性设置为'true，那么它将在任何Form控件获得Key事件之前处理Key事件。



我强烈建议......因为你正在做一些不太标准的Win UI设计...你建立了一个安全机制，所以用户不会取消应用程序......可能会丢失数据：

If you set the Form's 'KeyPreview Property to 'true, then it will handle a Key Event before any of the Form's Controls get the Key Event.

I would strongly suggest ... since you are doing something which is not quite standard Win UI design ... that you build in a safety mechanism so the user doesn't cancel the Application ... possibly losing data:

private void Form1_KeyUp(object sender, KeyEventArgs e)
{
    if (e.KeyCode == Keys.Escape)
    {
        if 
        (
            MessageBox.Show
            (
                "Quit the Application",
                "Exit Application Dialog",
                MessageBoxButtons.YesNo,
                MessageBoxIcon.Warning,
                MessageBoxDefaultButton.Button2 // hit Enter == No !
            )
            == DialogResult.Yes
        )
        {
           Application.Exit();
        }
    }
}

我更喜欢使用KeyUp事件。在真实世界的代码中，我将实现与用户是否已保存其工作相关的某种级别的警告！

I prefer to use the KeyUp Event. In "real-world code" I'd would be implementing some level of warning related to whether or not the user had saved their work !

我想tou应该使用表格 ProcessKeyPreview [ ^ ]。

I suppose tou should use the Form ProcessKeyPreview[^].

我建​​议这是一个实验的好时机，看看会发生什么。



如果文本框没有焦点怎么办 - 你的表格会退出吗？



这会导致你做出了正确的决定。

I would suggest that this is a good time to experiment and see what happens.

What if the textbox doesn't have focus - does your form exit?

This will lead you to the correct decision.

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