C#通过http Get方式获取返回页中的XML

        int intProid = Proid;
        string strCardid = Cardid;
        int intPaytype = Paytype;
        int intOrderid = Orderid;
        string strKey = Key;
        string path = "http://192.168.6.6/cardsys/api/api.php?proid=" + intProid + "&cardid=" + strCardid + "&paytype=" + intPaytype + "&orderid=" + intOrderid + "&key=" + strKey + "";
        bool ReturnValue = true;
        ReturnDataset = null;
        ErrorMessage = null;

        try
        {
            Uri uri = new Uri(path);
            WebRequest wreq = WebRequest.Create(uri);
            HttpWebResponse wresp = (HttpWebResponse)wreq.GetResponse();
            Stream s = wresp.GetResponseStream();
            StreamReader objReader = new StreamReader(s, System.Text.Encoding.GetEncoding("utf-8"));
            ReturnDataset.ReadXml(objReader);
        }
        catch
        {
            ReturnValue = false;
        }