WinForm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;
            }
        }