在Windows窗体覆盖标准关闭（X）按钮 [英] Override standard close (X) button in a Windows Form

问题描述

我如何去改变，当用户单击一个Windows的关闭（红色的X）按钮，会发生什么情况窗体应用程序（在C＃）？

How do I go about changing what happens when a user clicks the close (red X) button in a Windows Forms application (in C#)?

推荐答案

您可以覆盖 OnFormClosing 以做这个。只是要小心，你不要做任何事情太出乎意料，因为点击X关闭是一个很好理解的行为。

You can override OnFormClosing to do this. Just be careful you don't do anything too unexpected, as clicking the 'X' to close is a well understood behavior.

protected override void OnFormClosing(FormClosingEventArgs e)
{
    base.OnFormClosing(e);

    if (e.CloseReason == CloseReason.WindowsShutDown) return;

    // Confirm user wants to close
    switch (MessageBox.Show(this, "Are you sure you want to close?", "Closing", MessageBoxButtons.YesNo))
    {
    case DialogResult.No:
        e.Cancel = true;
        break;
    default:
        break;
    }        
}

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