最小化窗体的时候，将窗体放到托盘（NotifyIcon）

 if (WindowState == FormWindowState.Minimized)
            {
                this.Hide();
                ExcelNotifyIcon.ShowBalloonTip(15, "提示", "导出提示!", ToolTipIcon.Info);
            } 

 

private void ExcelNotifyIcon_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            if (base.WindowState.Equals(FormWindowState.Minimized))
            {
                base.WindowState = FormWindowState.Normal;

                base.Show();
                base.WindowState = FormWindowState.Normal;//重复一次，第二次就可以正常弹出
            }
        }