//定义报头

        public MySoapHeader soapheader;

        [SoapHeader("soapheader", Direction = SoapHeaderDirection.In)]

        [WebMethod]

        public string SaveUser(string userxml)

        {

            if (soapheader == null)

            {

                return "认证失败";

            }

            string msg = "";

            if (soapheader.IsValid(soapheader.UserID,soapheader.Password,out msg) == false)

            {

                return "认证失败:用户名或密码错误";

            }

            string a = "bbbb";

            return a;

        }

            _xmlNamespaces[URL] = XmlNs;//加入缓存，提高效率  

            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(URL);



            if (!string.IsNullOrEmpty(userName))

            {

               // request.Method = "HEAD";

                request.PreAuthenticate = true;

                NetworkCredential cre = new NetworkCredential(userName, passWord);

                request.Credentials = cre;

            }

            else

            {

                request.Credentials = CredentialCache.DefaultCredentials;



            }



            request.Method = "POST";

            request.ContentType = "text/xml; charset=utf-8 ";

            request.Headers.Add("SOAPAction", "\"" + XmlNs + (XmlNs.EndsWith("/") ? "" : "/") + MethodName + "\"");

            //soapheader验证

            

            request.Timeout = 10000;



            // SetWebRequest(request);



            //byte[] data = EncodeParsToSoap(Pars, XmlNs, MethodName);



            Hashtable ht = new Hashtable();

            ht["UserID"] = userName;

            ht["Password"] = passWord;



            byte[] data = EncodeParsToSoap(Pars, XmlNs, MethodName, ht, XmlNs, "MySoapHeader");







            WriteRequestData(request, data);

            XmlDocument doc = new XmlDocument(), doc2 = new XmlDocument();

            doc = ReadXmlResponse(request.GetResponse());



            XmlNamespaceManager mgr = new XmlNamespaceManager(doc.NameTable);

            mgr.AddNamespace("soap", "http://schemas.xmlsoap.org/soap/envelope/");

            String RetXml = doc.SelectSingleNode("//soap:Body/*/*", mgr).InnerXml;

            doc2.LoadXml("<root>" + RetXml + "</root>");

            AddDelaration(doc2);

            return doc2;