在 C# 中关闭 Window 表单应用程序中的 window 时发出警报

Alert on Closing window in Window Form Application in C#

我希望当用户通过单击 (X) 或按 ESC 键或按 [=4 关闭(窗口窗体应用程序,C#)中的 window 时=]ALT+F4,将显示一个警告,即一个对话框(包含两个按钮 OK 和 CANCEL)。 怎么办?

您可以通过简单的搜索找到它!

处理您表单的 Closing 事件:

this.Closing += OnClosing; // For example put this in the constructor of your form

private void OnClosing(object sender, CancelEventArgs cancelEventArgs)
{
        string msg = "Do you want to close this?";
        DialogResult result = MessageBox.Show(msg, "Close Confirmation",
            MessageBoxButtons.YesNo/*Cancel*/, MessageBoxIcon.Question);
        if (result == DialogResult.Yes)
            /* Do something */;
        else if (result == DialogResult.No)
            cancelEventArgs.Cancel = false;

}

您可以在应用程序级别执行此操作

    [STAThread]
    static void Main()
    {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.ApplicationExit += Application_ApplicationExit;
        AppDomain.CurrentDomain.ProcessExit += Application_ApplicationExit;
        Application.Run(new Form1());
    }
    static void Application_ApplicationExit(object sender, EventArgs e)
    {
        //Do something
    }