C#.Net 转换人民币大写金额

/// <summary>
    /// 转换人民币大小金额。
    /// </summary>
    public class RmbHelper
    {

        /// <summary>
        /// 转换人民币大小金额
        /// </summary>
        /// <param name="money">金额</param>
        /// <returns>返回大写形式</returns>
        public static string ToUpper(decimal money)
        {
            string str1 = "零壹贰叁肆伍陆柒捌玖"; //0-9所对应的汉字
            string str2 = "万仟佰拾亿仟佰拾万仟佰拾元角分"; //数字位所对应的汉字
            string str3 = ""; //从原num值中取出的值
            string str4 = ""; //数字的字符串形式
            string str5 = ""; //人民币大写金额形式
            int i; //循环变量
            int j; //num的值乘以100的字符串长度
            string ch1 = ""; //数字的汉语读法
            string ch2 = ""; //数字位的汉字读法
            int nzero = 0; //用来计算连续的零值是几个
            int temp; //从原num值中取出的值
            money = Math.Round(Math.Abs(money), 2); //将num取绝对值并四舍五入取2位小数
            str4 = ((long)(money * 100)).ToString(); //将num乘100并转换成字符串形式
            j = str4.Length; //找出最高位
            if (j > 15) { return "溢出"; }
            str2 = str2.Substring(15 - j); //取出对应位数的str2的值。如：200.55,j为5所以str2=佰拾元角分
                                           //循环取出每一位需要转换的值
            for (i = 0; i < j; i++)
            {
                str3 = str4.Substring(i, 1); //取出需转换的某一位的值
                temp = Convert.ToInt32(str3); //转换为数字
                if (i != (j - 3) && i != (j - 7) && i != (j - 11) && i != (j - 15))
                {
                    //当所取位数不为元、万、亿、万亿上的数字时
                    if (str3 == "0")
                    {
                        ch1 = "";
                        ch2 = "";
                        nzero = nzero + 1;
                    }
                    else
                    {
                        if (str3 != "0" && nzero != 0)
                        {
                            ch1 = "零" + str1.Substring(temp * 1, 1);
                            ch2 = str2.Substring(i, 1);
                            nzero = 0;
                        }
                        else
                        {
                            ch1 = str1.Substring(temp * 1, 1);
                            ch2 = str2.Substring(i, 1);
                            nzero = 0;
                        }
                    }
                }
                else
                {
                    //该位是万亿，亿，万，元位等关键位
                    if (str3 != "0" && nzero != 0)
                    {
                        ch1 = "零" + str1.Substring(temp * 1, 1);
                        ch2 = str2.Substring(i, 1);
                        nzero = 0;
                    }
                    else
                    {
                        if (str3 != "0" && nzero == 0)
                        {
                            ch1 = str1.Substring(temp * 1, 1);
                            ch2 = str2.Substring(i, 1);
                            nzero = 0;
                        }
                        else
                        {
                            if (str3 == "0" && nzero >= 3)
                            {
                                ch1 = "";
                                ch2 = "";
                                nzero = nzero + 1;
                            }
                            else
                            {
                                if (j >= 11)
                                {
                                    ch1 = "";
                                    nzero = nzero + 1;
                                }
                                else
                                {
                                    ch1 = "";
                                    ch2 = str2.Substring(i, 1);
                                    nzero = nzero + 1;
                                }
                            }
                        }
                    }
                }
                if (i == (j - 11) || i == (j - 3))
                {
                    //如果该位是亿位或元位，则必须写上
                    ch2 = str2.Substring(i, 1);
                }
                str5 = str5 + ch1 + ch2;
                if (i == j - 1 && str3 == "0")
                {
                    //最后一位（分）为0时，加上“整”
                    str5 = str5 + "整";
                }
            }
            if (money == 0)
            {
                str5 = "零元整";
            }
            return str5;
        }

    }

            var s0 = RmbHelper.ToUpper(0);//零元整
            var s1 = RmbHelper.ToUpper(1);//壹元整
            var s2 = RmbHelper.ToUpper(999);//玖佰玖拾玖元整
            var s3 = RmbHelper.ToUpper(999.99m);//玖佰玖拾玖元玖角玖分
            var s4 = RmbHelper.ToUpper(999999999999);//玖仟玖佰玖拾玖亿玖仟玖佰玖拾玖万玖仟玖佰玖拾玖元整
            var s5 = RmbHelper.ToUpper(999999999999.99m);//玖仟玖佰玖拾玖亿玖仟玖佰玖拾玖万玖仟玖佰玖拾玖元玖角玖分
            var s6 = RmbHelper.ToUpper(199999999999.99m);//壹仟玖佰玖拾玖亿玖仟玖佰玖拾玖万玖仟玖佰玖拾玖元玖角玖分
            var s7 = RmbHelper.ToUpper(123456789.12m);//壹亿贰仟叁佰肆拾伍万陆仟柒佰捌拾玖元壹角贰分
            var s8 = RmbHelper.ToUpper(10000);//壹万元整
            var s9 = RmbHelper.ToUpper(10001.1m);//壹万零壹元壹角整