protected override CreateParams CreateParams

        {

            get

            {

                const int WS_EX_APPWINDOW = 0x40000;

                const int WS_EX_TOOLWINDOW = 0x80;

                CreateParams cp = base.CreateParams;

                cp.ExStyle &= (~WS_EX_APPWINDOW);    // 不显示在TaskBar

                cp.ExStyle |= WS_EX_TOOLWINDOW;      // 不显示在Alt+Tab

                return cp;

            }

        }