禁用Alt + F4，但允许使用代码CloseReason关闭表单. [英] Disable Alt+F4 but allow the form to be closed by code, CloseReason.UserClosing is not helping

问题描述

我希望通过执行 Alt + F4 不会关闭该表单，但是如果从同一表单调用Application.Exit()或this.Close，则应将其关闭

I want that the form will not close by doing Alt + F4 but if Application.Exit() or this.Close is called from the same Form, it should be closed.

我尝试了CloseReason.UserClosing，但仍然没有帮助.

I tried CloseReason.UserClosing but still no help.

推荐答案

如果仅需要过滤 Alt + F4 事件(请单击关闭框，this.Close()和Application.Exit()照常运行)，那么我可以提出以下建议:

If you need to filter out Alt + F4 event only (leaving clicking of close box, this.Close() and Application.Exit() to behave as usual) then I can suggest the following:

1. 设置表单的 KeyPreview 属性true;

2. 连接表单的 和 KeyDown 事件:

1. Set form's KeyPreview property to true;

2. Wire up form's FormClosing and KeyDown events:

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
    if (_altF4Pressed)
    {
        if (e.CloseReason == CloseReason.UserClosing)
            e.Cancel = true;
        _altF4Pressed = false;
    }
}

private bool _altF4Pressed;
private void Form1_KeyDown(object sender, KeyEventArgs e)
{
    if (e.Alt && e.KeyCode == Keys.F4)
        _altF4Pressed = true;
}

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