public override bool Login(string userName, string password)        {            using (HttpClient client = new HttpClient(URI))            {                StringBuilder sb = new StringBuilder();                sb.Append("Login");                Uri uri = new Uri(URI + sb.ToString());                Login lg = new Login();                lg.userName = userName;                lg.password = password;                HttpContent content = HttpContentExtensions.CreateXmlSerializable<Login>(lg, null);                StringBuilder conntentStr = new StringBuilder();                //string s = content.ReadAsString();                using (HttpRequestMessage request = new HttpRequestMessage("POST", uri, content))                {                    request.Headers.Accept.AddString(accepts);                    using (HttpResponseMessage response = client.Send(request))                    {                        Microsoft.Http.Headers.Cookie cook=null;                        if(response.Headers.SetCookie!=null && response.Headers.SetCookie.Count>0)                        {                            cook= response.Headers.SetCookie[0];                            CookieMe.SaveCookie(cook["YourAuth"]);                        }                                              Stream result = response.Content.ReadAsStream();                        XmlSerializer ser = new XmlSerializer(typeof(LoginResponse));//将对象序列化到xml文档                        LoginResponse lr = (LoginResponse)ser.Deserialize(result);                        return lr.LoginResult;                    }                }                            }        }