四舍五入

        public double ChinaRound(double value, int decimals)        {            if (value < 0)            {                return Math.Round(value + 5 / Math.Pow(10, decimals + 1), decimals, MidpointRounding.AwayFromZero);            }            else            {                return Math.Round(value, decimals, MidpointRounding.AwayFromZero);            }        }