private static void TestDisplayDecimal()

        {

            // 结论1：string.Format("{0:N2}", d) 与  Math.Round(d, 2).ToString() 【不总是相等】

            // 结论2:string.Format("{0:N2}", d) 与 RoundChinese(d, 2).ToString() 【总是相等】

            for (var i = ; i <= ; i++)

            {

                var d = 2.14M + i / 1000M;

                bool ret = string.Format("{0:N2}", d) == Math.Round(d, ).ToString();

                if (!ret)

                {

                    Console.WriteLine(d + ":" + string.Format("{0:N2}", d) + "," + Math.Round(d, ) + "," + ret);

                }

            }

            Console.WriteLine("-----------------------");

            for (var i = ; i <= ; i++)

            {

                var d = 2.14M + i / 1000M;

                bool ret = string.Format("{0:N2}", d) == RoundChinese(d, ).ToString();

                Console.WriteLine(d + ":" + string.Format("{0:N2}", d) + "," + RoundChinese(d, ).ToString() + "," + ret);

            }

        }

        /// <summary>

        /// 中国版的四舍五入

        /// </summary>

        /// <param name="value"></param>

        /// <param name="digit"></param>

        /// <returns></returns>

        public static decimal RoundChinese(decimal value, int digit)

        {

            double vt = Math.Pow(, digit);

            //1.乘以倍数 + 0.5

            decimal vx = value * (decimal)vt + 0.5M;

            //2.向下取整

            decimal temp = Math.Floor(vx);

            //3.再除以倍数

            return (temp / (decimal)vt);

        }