//这是get
try
            {
                string uri = string.Format("{0}/CheckService", AppConfig.ServiceUrl);
                HttpWebRequest wr = (HttpWebRequest)WebRequest.Create(uri);
                wr.Credentials = CredentialCache.DefaultCredentials;
                wr.ContentLength = 0;
                wr.Method = "GET";

                using (HttpWebResponse resp = (HttpWebResponse)wr.GetResponse())
                {
                    if (resp.ContentLength <= 0)
                    {
                        return false;
                    }
                    else
                    {
                        using (Stream respStream = resp.GetResponseStream())
                        {
                            StreamReader sr = new StreamReader(respStream);
                            string result = sr.ReadToEnd();
                            return result == "OK";
                        }
                    }
                }
            }
            catch (Exception)
            {
                return false;
            }

//这是post
try
            {
                MessageInfo messageInfo = new MessageInfo();
                messageInfo.Message = message;
                messageInfo.MessageTime = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");

                string uri = string.Format("{0}/InsertDeviceMessageInfo", AppConfig.ServiceUrl);

                byte[] bs = Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(messageInfo));
                HttpWebRequest wr = (HttpWebRequest)WebRequest.Create(uri);
                wr.Credentials = CredentialCache.DefaultCredentials;
                wr.Method = "POST";
                wr.Timeout = 5000;
                wr.ContentLength = bs.Length;
                wr.ContentType = "application/json";

                using (Stream reqStream = wr.GetRequestStream())
                {
                    reqStream.Write(bs, 0, bs.Length);
                    reqStream.Close();
                }

                using (HttpWebResponse resp = (HttpWebResponse)wr.GetResponse())
                {
                    if (resp.ContentLength <= 0)
                    {
                        return -1;
                    }
                    else
                    {
                        using (Stream respStream = resp.GetResponseStream())
                        {
                            StreamReader sr = new StreamReader(respStream);
                            string result = sr.ReadToEnd();
                            return int.Parse(result);
                        }
                    }
                }
            }
            catch
            {
                return -1;
            }