直接分析接口返回内容

public string GetProductID(string spid, string userid, string usertoken)
    {
       
        string products = "";
        //byte[] bytes = Encoding.UTF8.GetBytes("<?xml version=\"1.0\" encoding=\"utf-8\"?><soap:Envelope xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope//" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance/" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema/%22%3E%3Csoap:Body%3E%3Cusersubedproducts xmlns=\"http://vas.webservice..shtel.com/%22%3E%3Creq%3E%3Cspid>" + spid + "</SPID><userID>" + userid + "</userID><userToken>" + usertoken + "</userToken></req></userSubedProducts></soap:Body></soap:Envelope>");
        byte[] bytes = Encoding.UTF8.GetBytes("<?xml version=\"1.0\" encoding=\"utf-8\"?><soapenv:Envelope xmlns:soapenv=\"http://schemas.xmlsoap.org/soap/envelope//" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance/"  xmlns:xsd=\"http://www.w3.org/2001/XMLSchema/%22%3E%3Csoapenv:Body%3E%3Cusersubedproducts xmlns=\"http://vas.webservice.shtel.com/%22%3E%3Creq%3E%3Cspid>" + spid + "</SPID><userID>" + userid + "</userID><userToken>" + usertoken + "</userToken></req></userSubedProducts></soapenv:Body></soapenv:Envelope>");

        HttpWebRequest request = WebRequest.Create("http://iptvauth.online.sh.cn:7001/services/VasServiceSoapImpl") as HttpWebRequest;
        request.Method = "POST";
        request.ContentType = "text/xml";
        request.CookieContainer = new CookieContainer();
        request.ContentLength = bytes.Length;
        request.AllowAutoRedirect = false;
        request.Headers.Add("SOAPAction", "");

        using (Stream requestStream = request.GetRequestStream())

            requestStream.Write(bytes, 0, bytes.Length);
        StreamReader sr = null;

        string responseStr = string.Empty;

        using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
        {
            sr = new StreamReader(response.GetResponseStream(), Encoding.Default);
            responseStr = sr.ReadToEnd();
        }
        XmlDocument xmldoc = new XmlDocument();
        xmldoc.Load(new System.IO.MemoryStream(System.Text.Encoding.GetEncoding("GB2312").GetBytes(responseStr)));

        XmlNodeList proList = xmldoc.GetElementsByTagName("productID");

        for (int i = 0; i < proList.Count; i++)
        {
            products += proList[i].InnerText + ";";
        }

        if (products != "")
            products = products.Substring(0, products.Length - 1);

        return products;
    }