人民币大小写金额

  public 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 
            Int32.TryParse(str3, out temp);
            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;
    }