小写金额转换成大写

 private   string RMBEncode(decimal num)
    {

        try
        {

            string str1 = "零壹贰叁肆伍陆柒捌玖";

            string str2 = "万仟佰拾亿仟佰拾万仟佰拾元角分";

            string str3 = "";

            string str4 = "";

            string str5 = "";

            string ch1 = "";

            string ch2 = "";

            int nzero = 0;

            num = Math.Round(Math.Abs(num), 2);

            str4 = ((long)(num * 100M)).ToString();

            int j = str4.Length;

            if (j > 15)
            {

                return "溢出";

            }

            str2 = str2.Substring(15 - j);

            for (int i = 0; i < j; i++)
            {

                str3 = str4.Substring(i, 1);

                int temp = Convert.ToInt32(str3);

                if ((((i != (j - 3)) && (i != (j - 7))) && (i != (j - 11))) && (i != (j - 15)))
                {

                    if (str3 == "0")
                    {

                        ch1 = "";

                        ch2 = "";

                        nzero++;

                    }

                    else if ((str3 != "0") && (nzero != 0))
                    {

                        ch1 = "零" + str1.Substring(temp, 1);

                        ch2 = str2.Substring(i, 1);

                        nzero = 0;

                    }

                    else
                    {

                        ch1 = str1.Substring(temp, 1);

                        ch2 = str2.Substring(i, 1);

                        nzero = 0;

                    }

                }

                else if ((str3 != "0") && (nzero != 0))
                {

                    ch1 = "零" + str1.Substring(temp, 1);

                    ch2 = str2.Substring(i, 1);

                    nzero = 0;

                }

                else if ((str3 != "0") && (nzero == 0))
                {

                    ch1 = str1.Substring(temp, 1);

                    ch2 = str2.Substring(i, 1);

                    nzero = 0;

                }

                else if ((str3 == "0") && (nzero >= 3))
                {

                    ch1 = "";

                    ch2 = "";

                    nzero++;

                }

                else if (j >= 11)
                {

                    ch1 = "";

                    nzero++;

                }

                else
                {

                    ch1 = "";

                    ch2 = str2.Substring(i, 1);

                    nzero++;

                }

                if ((i == (j - 11)) || (i == (j - 3)))
                {

                    ch2 = str2.Substring(i, 1);

                }

                str5 = str5 + ch1 + ch2;

                if ((i == (j - 1)) && (str3 == "0"))
                {

                    str5 = str5 + '整';

                }

            }

            if (num == 0M)
            {

                str5 = "零元整";

            }

            return str5;

        }

        catch
        {

            return "非法数据";

        }

    }



    public  string RMBEncode(string numstr)
    {

        try
        {

            return RMBEncode(Convert.ToDecimal(numstr));

        }

        catch
        {

            return "非数字形式！";

        }

    }