/// <summary>

        /// 全选中数字文本框内容

        /// </summary>

        /// <param name="o"></param>

        public static void numericSelectAll(this object o)

        {

            System.Windows.Forms.NumericUpDown upDown = (System.Windows.Forms.NumericUpDown)o;

            upDown.Focus();

            System.Windows.Forms.UpDownBase up = upDown;

            upDown.Select(0, up.Text.Length);

        }