金额小写变大写 C#版

    /**//// <summary>
        /// 金额小写变大写
        /// </summary>
        /// <param name="smallnum"></param>
        /// <returns></returns>
        public static string gMoney(decimal smallnum)                                                                                
        {
            string cmoney , cnumber, cnum, cnum_end,cmon ,cno,snum ,sno;
            int snum_len , sint_len, cbegin, zflag , i;
            if(smallnum > 1000000000000 || smallnum < -99999999999 || smallnum == 0)
                return "";
            cmoney = "仟佰拾亿仟佰拾万仟佰拾元角分" ;// 大写人民币单位字符串
            cnumber = "壹贰叁肆伍陆柒捌玖"          ;// 大写数字字符串
            cnum = ""                               ;// 转换后的大写数字字符串
            cnum_end = ""                           ;// 转换后的大写数字字符串的最后一位
            cmon = ""                               ;// 取大写人民币单位字符串中的某一位
            cno = ""                                ;// 取大写数字字符串中的某一位


            
            snum = Round(smallnum,2).ToString("############.00");  ;// 小写数字字符串
            snum_len = snum.Length                  ;// 小写数字字符串的长度
            sint_len = snum_len - 2                 ;// 小写数字整数部份字符串的长度
            sno = ""                                ;// 小写数字字符串中的某个数字字符
            cbegin = 15 - snum_len                  ;// 大写人民币单位中的汉字位置
            zflag = 1                               ;// 小写数字字符是否为0(0=0)的判断标志
            i = 0                                   ;// 小写数字字符串中数字字符的位置

            if(snum_len > 15)
                return "";
            for(i=0;i<snum_len;i++) 
            {
                if (i==sint_len-1)
                    continue;

                
                cmon = cmoney.Substring(cbegin, 1);
                cbegin = cbegin + 1;
                sno =snum.Substring(i,1);
                if (sno=="-")
                {
                    cnum = cnum + "负";
                    continue;
                }
                else if(sno=="0")
                {
                    cnum_end = cnum.Substring(cnum.Length-2,1);
                    if(cbegin == 4 || (cbegin == 8 || cnum_end.IndexOf("亿")>=0|| cbegin == 12 ))
                    {
                        cnum = cnum + cmon;
                        if (cnumber.IndexOf(cnum_end)>=0 )
                            zflag = 1;
                        else
                            zflag = 0;
                    }
                    else
                    {
                        zflag = 0;
                    }
                    continue;
                }
                else if( sno != "0" && zflag == 0)
                {
                    cnum = cnum + "零";
                    zflag = 1;
                }
                cno =cnumber.Substring(System.Convert.ToInt32(sno)-1, 1);
                cnum = cnum + cno + cmon;
            }
            if (snum.Substring(snum.Length-2,1)=="0")
            {
                return  cnum + "整";
            }
            else
                return cnum;
        }