货币中的小写转大写

    /// <summary>
    /// 单个数字转为大写
    /// </summary>
    /// <param name="c">小写阿拉伯数字 0---9</param>
    /// <returns>大写数字</returns>
    private string getint(char c)
    {
        string str = "";
        switch (c)
        {
            case '0':
                str = "零";
                break;
            case '1':
                str = "壹";
                break;
            case '2':
                str = "贰";
                break;
            case '3':
                str = "叁";
                break;
            case '4':
                str = "肆";
                break;
            case '5':
                str = "伍";
                break;
            case '6':
                str = "陆";
                break;
            case '7':
                str = "柒";
                break;
            case '8':
                str = "拐";
                break;
            case '9':
                str = "玖";
                break;
        }
        return str;
    }
    /// 把一个单元转为大写，如亿单元，万单元，个单元
    /// </summary>
    /// <param name="str">这个单元的小写数字（4位长，若不足，则前面补零）</param>
    /// <param name="strDW">亿，万，元</param>
    /// <returns>转换结果</returns>
    private string getupper(string str, string strDW)
    {
        if (str == "0000")
            return "";

        string ret = "";
        string tmp1 = this.getint(str[0]);
        string tmp2 = this.getint(str[1]);
        string tmp3 = this.getint(str[2]);
        string tmp4 = this.getint(str[3]);
        if (tmp1 != "零")
        {
            ret = ret + tmp1 + "仟";
        }
        else
        {
            ret = ret + tmp1;
        }

        if (tmp2 != "零")
        {
            ret = ret + tmp2 + "佰";
        }
        else
        {
            if (tmp1 != "零")//保证若有两个零'00'，结果只有一个零，下同
                ret = ret + tmp2;
        }

        if (tmp3 != "零")
        {
            ret = ret + tmp3 + "拾";
        }
        else
        {
            if (tmp2 != "零")
                ret = ret + tmp3;
        }

        if (tmp4 != "零")
        {
            ret = ret + tmp4;
        }

        if (ret[0] == '零')//若第一个字符是'零'，则去掉
            ret = ret.Substring(1);
        if (ret[ret.Length - 1] == '零')//若最后一个字符是'零'，则去掉
            ret = ret.Substring(0, ret.Length - 1);

        return ret + strDW;//加上本单元的单位

    }