如何使用 alt + F4 防止任何表单关闭 [英] How do prevent any Form from closing using alt + F4

问题描述

这不是

并将Aight"按钮单击侦听器设置为:

private void Aight_buton_Click(object sender, EventArgs e){dr = DialogResult.OK;关闭();}

X"按钮的情况也是如此.按照上述问题的答案，我可以这样做:

private void Form1_FormClosing(object sender, FormClosingEventArgs e){e.Cancel = e.CloseReason == CloseReason.UserClosing;}

但由于我在 Aight_buton_Click 下使用 Close()，它仍然注册为 e.CloseReason == CloseReason.UserClosing;.所以按下键不会关闭我的表单(自定义消息框)，Alt+F4 也不会.我想知道我如何具体地只防止 Alt+F4 关闭而不是 Close() 关闭.请我宁愿不使用 ModifierKeys 因为它不是处理这种情况的最合适也不是最聪明的方法.

解决方案

自己处理 Atl+F4 并设置它处理.

在表单构造函数中先设置

this.KeyPreview = true;

然后处理keyDown事件

 private void Form1_KeyDown(object sender, KeyEventArgs e){if (e.Alt && e.KeyCode == Keys.F4){e.handled = true;}}

This is not a duplicate of How to Disable Alt + F4 closing form?. Please read why.

I have made a custom MessageBox under my main Form.

And have set "Aight" button click listener as:

private void Aight_buton_Click(object sender, EventArgs e)
{
    dr = DialogResult.OK;
    Close();
}

The same is the case with the "X" button. Following the above question's answer I could have done this:

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
    e.Cancel = e.CloseReason == CloseReason.UserClosing;
}

but since I am using Close() under the Aight_buton_Click it still registers as e.CloseReason == CloseReason.UserClosing;. So hitting the key doesn't close my form (a custom messagebox) nor does Alt+F4. I would like to know how specifically I can prevent only Alt+F4 closes and not the Close() closes. And please I would rather not use ModifierKeys as it is not the most appropriate not the smartest way to handle this situation.

解决方案

Handle Atl+F4 by your self and set it handled.

In the form constructor first set

this.KeyPreview = true;

Then handle the keyDown event

 private void Form1_KeyDown(object sender, KeyEventArgs e)
 {
     if (e.Alt && e.KeyCode == Keys.F4)
     {
         e.Handled = true;
     }

 }

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