RMB 金额数字转换成大写

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/// <summary>        /// 转换人民币大小金额        /// </summary>        /// <param name="num">金额</param>        /// <returns>返回大写形式</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";            }            return str5;        }