禁用ALT + F4但允许的形式，由code被关闭，CloseReason.UserClosing是没有帮助 [英] Disable Alt+F4 but allow the the form to be closed by code, CloseReason.UserClosing is not helping

问题描述

我想，窗体不会关闭通过执行<大骨节病>替代 + <大骨节病> F4 但是，如果 Application.Exit（）或 this.Close 从相同的形式被调用时，应当将其关闭。

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.

我试过 CloseReason.UserClosing ，但仍然无济于事。

I tried CloseReason.UserClosing but still no help.

推荐答案

如果您需要过滤掉<大骨节病>替代 + <大骨节病> F4关闭箱事件只（留点击， this.Close（）和 Application.Exit（）来表现像往常一样），那么我可以建议如下：

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. 设置窗体的 键preVIEW 属性真;

2. 电线表单的 的FormClosing 和的 的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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