获取银行货币汇率的

这个主要公司做外贸的每天都需要更新汇率，本来以前有一个服务可以调用，但是那个连接用不了 所以就写了一个这样的东西 套取网页显示信息

class ExchangeRate
    {

        private const string _BASEURL = "网页地址";
        public  const string CURRENCYCODE = "货币类型以'|'隔开";//货币类型

        public Hashtable GetValues()
        {
            Hashtable htReturn = new Hashtable();

            string url = _BASEURL; //+ HttpUtility.UrlEncode(tmSet.ToString("yyyy/MM/dd", DateTimeFormatInfo.InvariantInfo));

            WebClient wc = new WebClient();
            string sHtml = wc.DownloadString(url);
            string sXml = string.Empty;
            int iValueCnt = CURRENCYCODE.Split(new char[] { '|' }, 10, StringSplitOptions.RemoveEmptyEntries).Length;
            string[] sTBody = sHtml.Split(new string[] { "<tbody>", "</tbody>" }, StringSplitOptions.RemoveEmptyEntries);
            foreach (string ss in sTBody)
            {
                if (ss.Contains("Currency Name"))
                {
                    string[] sbrs = ss.Split(new string[] { "</tr>" }, StringSplitOptions.RemoveEmptyEntries);
                    foreach (string sbr in sbrs)
                    {
                        string scur = string.Empty;
                        double dRate = GetCurrencyRate(sbr, out scur);

                        if (dRate != 0.0 && !string.IsNullOrEmpty(scur))
                        {
                            htReturn.Add(scur, dRate * 0.01);
                            if (htReturn.Count >= iValueCnt)
                                break;
                        }
                    }
                    break;
                }
            }


            return htReturn;
        }

        private double GetCurrencyRate(string source, out string sCurrency)
        {
            sCurrency = string.Empty;

            string sPattern = @"<td.+?>(.+?)</td>";
            foreach (Match m in Regex.Matches(source, sPattern))
            {
                string ss = m.Groups[1].Value;
                if (IsNumeric(ss))
                    return double.Parse(ss);
                else
                {
                    if (CURRENCYCODE.Contains(ss))
                        sCurrency = ss.Trim();
                    else
                        break;
                }
            }

            return 0.0;
        }

        public static bool IsNumeric(string str)
        {
            if (string.IsNullOrEmpty(str)) return false;

            System.Text.RegularExpressions.Regex reg = new System.Text.RegularExpressions.Regex(@"^[-]?\d+[.|,]?\d*$");
            return reg.IsMatch(str);
        }
    }