数字金额转大写

public class Money2String
    {

        private static readonly String   cnNumber      = "零壹贰叁肆伍陆柒捌玖";
        private static readonly String   cnUnit        = "分角元拾佰仟万拾佰仟亿拾佰仟兆拾佰仟";

        private static readonly String[] enSmallNumber = {"", "ONE", "TWO", "THREE", "FOUR", "FIVE", "SIX", "SEVEN", "EIGHT", "NINE", "TEN", "ELEVEN", "TWELVE", "THIRTEEN", "FOURTEEN", "FIFTEEN", "SIXTEEN", "SEVENTEEN", "EIGHTEEN", "NINETEEN"};
        private static readonly String[] enLargeNumber = {"TWENTY", "THIRTY", "FORTY", "FIFTY", "SIXTY", "SEVENTY", "EIGHTY", "NINETY"};
        private static readonly String[] enUnit        = {"", "THOUSAND", "MILLION", "BILLION", "TRILLION"};

        // 以下是货币金额中文大写转换方法
        public static String GetCnString(String MoneyString)
        {
            #region old
            
            MoneyString = MoneyString.Replace(",","");
            string[] tmpString  = MoneyString.Split('.');
            string intString  = MoneyString;   // 默认为整数
            string decString  = "";            // 保存小数部分字串
            string rmbCapital = "";            // 保存中文大写字串
            int k;
            int j;
            int n;

            if (tmpString.Length>1)
            {
                intString = tmpString[0];             // 取整数部分
                decString = tmpString[1];             // 取小数部分
            }
            decString += "00";
            decString  = decString.Substring (0,2);   // 保留两位小数位
            intString += decString;

            try
            {
                k = intString.Length -1;
                if (k>0 && k<18)
                {
                    for (int i=0;i<=k;i++)
                    {
                        j=(int)intString[i] - 48;
                        // rmbCapital = rmbCapital + cnNumber[j] + cnUnit[k-i];     // 供调试用的直接转换
                        n = i+1 >= k ? (int)intString[k] - 4 : (int)intString[i+1] - 48; // 等效于 if( ){ }else{ }
                        if (j==0&&i<=k-2&&i>0)
                        {
                            if(k-i==2 || k-i==6 || k-i==10 || k-i==14)
                            {
                                rmbCapital += cnUnit[k-i];
                            }
                            else
                            {
                                if (n != 0)
                                {
                                    rmbCapital  += cnNumber[j];
                                }
                            }
                        }
                        else
                        {
                            rmbCapital = rmbCapital + cnNumber[j] + cnUnit[k-i];
                        }
                    }

                    rmbCapital = rmbCapital.Replace ("兆亿万", "兆");
                    rmbCapital = rmbCapital.Replace ("兆亿", "兆");
                    rmbCapital = rmbCapital.Replace ("亿万", "亿");
                    rmbCapital = rmbCapital.TrimStart('元');
                    //rmbCapital = rmbCapital.TrimStart('零');
                    string strHB = "零角零分";
                    if(rmbCapital.Substring(rmbCapital.Length - strHB.Length, strHB.Length) == strHB)
                    {
                        rmbCapital = rmbCapital.Substring(0, rmbCapital.Length - strHB.Length) + "整";
                    }
                   
                    if(rmbCapital.Substring(rmbCapital.Length-2,2) == "零分")
                    {
                        rmbCapital = rmbCapital.Substring(0,rmbCapital.Length-    2);
                    }

                    if (rmbCapital.Length>2)
                    {
                        if (rmbCapital.Substring(0,2)=="壹拾")
                        {
                            //rmbCapital = rmbCapital.Substring(1);
                        }
                    }
                    return rmbCapital;
                }
                else
                {
                    return "";   // 超出转换范围时，返回零长字串
                }
            }
            catch
            {
                return "";   // 含有非数值字符时，返回零长字串
            }

           
            #endregion
/*
            #region new
            try
            {
                return CmycurD(Convert.ToDecimal(MoneyString));
            }
            catch
            {
                return "";
            }#endregion*/
           
        }

        /// <summary>
        /// 中信提出后新做的转换方法
        /// </summary>
        /// <param name="num"></param>
        /// <returns></returns>
        public static string CmycurD(decimal num)
        {
            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

            num = Math.Round(Math.Abs(num), 2);    //将num取绝对值并四舍五入取2位小数
            str4 = ((long)(num * 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 (num == 0)
            {
                str5 = "零元整";
            }

            //add by czy
            if (str4.Substring(str4.Length - 2, 1) != "0")
                str5 = str5.Replace("元零", "元");
            //add by czy

            return str5;
        }
    }