winform无边框窗体点击任务栏最小化

        protected override CreateParams CreateParams
        {
            get
            {
                const int WS_MINIMIZEBOX = 0x00020000;  // Winuser.h中定义
                CreateParams cp = base.CreateParams;
                cp.Style = cp.Style | WS_MINIMIZEBOX;   // 允许最小化操作
                return cp;
            }
        }