阿拉伯数字转换成金额大写金额（包括小数）

/// <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 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 (int 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;
}