C# 金额转大写

/// <summary>
        /// 金额转大写
        /// </summary>
        /// <param name="s"></param>
        /// <returns></returns>
        public static string AmountToChinese(double s)
        {
            s = Math.Round(s, 2);//四舍五入到两位小数，即分
            string[] n = { "零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖" };
            //数字转大写
            string[] d = { "", "分", "角", "元", "拾", "佰", "仟", "万", "拾", "佰", "仟", "亿" };
            //不同位置的数字要加单位
            List<string> needReplace = new List<string> { "零拾", "零佰", "零仟", "零万", "零亿", "亿万", "零元", "零零", "零角", "零分" };
            List<string> afterReplace = new List<string> { "零", "零", "零", "万", "亿", "亿", "元", "零", "", "" };//特殊情况用replace剔除
            string e = s % 1 == 0 ? "整" : "";//金额是整数要加一个“整”结尾
            string re = "";
            long a = (long)(s * 100);
            int k = 1;
            while (a != 0)
            {//初步转换为大写+单位
                re = n[a % 10] + d[k] + re;
                a = a / 10;
                k = k < 11 ? k + 1 : 4;
            }
            string need = needReplace.Where(tb => re.Contains(tb)).FirstOrDefault<string>();
            while (need != null)
            {
                int i = needReplace.IndexOf(need);
                re = re.Replace(needReplace[i], afterReplace[i]);
                need = needReplace.Where(tb => re.Contains(tb)).FirstOrDefault<string>();
            }//循环排除特殊情况
            re = re == "" ? "" : re + e;
            return re;
        }