C#實現阿拉伯數字(小寫金額)到大寫中文(大寫金額)的轉換

/// <summary>
    /// 本類實現阿拉伯數字到大寫中文的轉換
    /// 該類沒有對非法數字進行判別,請事先自己判斷數字是否合法
    /// </summary>
    public class ChineseNum
    {

　　　//小寫轉大寫
        public static string GetChineseNum(string p_num)
        {
            ChineseNum cn = new ChineseNum();

            return cn.NumToChn(p_num);
        }

　　　//小寫金額轉大寫金額

        public static string GetUpperMoney(double p_Money)
        {
            ChineseNum cn = new ChineseNum();

            return cn.GetMoneyChinese(p_Money);
        }

        //轉換數字
        private char CharToNum(char x)
        {
            string stringChnNames = "零一二三四五六七八九";
            string stringNumNames = "0123456789";
            return stringChnNames[stringNumNames.IndexOf(x)];
        }

        //轉換萬以下整數
        private string WanStrToInt(string x)
        {
            string[] stringArrayLevelNames = new string[4] { "", "十", "百", "千" };
            string ret = "";
            int i;
            for (i = x.Length - 1; i >= 0; i--)
                if (x[i] == 0)
                {
                    ret = CharToNum(x[i]) + ret;
                }
                else
                {
                    ret = CharToNum(x[i]) + stringArrayLevelNames[x.Length - 1 - i] + ret;
                }
            while ((i = ret.IndexOf("零零")) != -1)
            {
                ret = ret.Remove(i, 1);
            }
            if (ret[ret.Length - 1] == 零 && ret.Length > 1)
            {
                ret = ret.Remove(ret.Length - 1, 1);
            }
            if (ret.Length >= 2 && ret.Substring(0, 2) == "一十")
            {
                ret = ret.Remove(0, 1);
            }
            return ret;
        }

        //轉換整數
        private string StrToInt(string x)
        {
            int len = x.Length;
            string ret, temp;
            if (len <= 4)
            {
                ret = WanStrToInt(x);
            }
            else if (len <= 8)
            {
                ret = WanStrToInt(x.Substring(0, len - 4)) + "萬";
                temp = WanStrToInt(x.Substring(len - 4, 4));
                if (temp.IndexOf("千") == -1 && temp != "")
                    ret += "零" + temp;
                else
                    ret += temp;
            }
            else
            {
                ret = WanStrToInt(x.Substring(0, len - 8)) + "億";
                temp = WanStrToInt(x.Substring(len - 8, 4));
                if (temp.IndexOf("千") == -1 && temp != "")
                {
                    ret += "零" + temp;
                }
                else
                {
              &nbs