基于HttpWebRequest，HttpWebResponse发起请求

/// <summary>
        /// 获取版本更新信息  GET
        /// </summary>
        /// <param name="softwareKey">软件的标识</param>
        /// <returns></returns>
        public static ResponseResult<UpdateInfo> GetUpdateInfo(string softwareKey)
        {
            ResponseResult<UpdateInfo> updateInfo = new ResponseResult<UpdateInfo>();
            if (!IsConnectInternet())
            {
                updateInfo.statusCode = 404;
                return updateInfo;
            }
            string updateInfoStr = null;

#if DEBUG
            Uri address = new Uri("http://xxxx/Api/UpdateCenter/GetUpdateInfo?softwareKey=" + softwareKey);

#else
            Uri address = new Uri("http://xxxx/Api/UpdateCenter/GetUpdateInfo?softwareKey=" + softwareKey);
#endif
            try
            {    // 使用httpwebrequest调用api接口
                HttpWebRequest httpWebRequest = (HttpWebRequest)HttpWebRequest.Create(address);
                httpWebRequest.Method = "GET";

                HttpWebResponse httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
                StreamReader streamReader = new StreamReader(httpWebResponse.GetResponseStream());
                updateInfoStr = streamReader.ReadToEnd();

                if (!string.IsNullOrWhiteSpace(updateInfoStr))
                {
                    updateInfo = JsonConvert.DeserializeObject<ResponseResult<UpdateInfo>>(updateInfoStr);
                    return updateInfo;
                }
            }
            catch (Exception ex)
            {
            }
            return null;
        }

/// <summary>
        /// 报送版本号与序列号  POST
        /// </summary>
        public static void PostVersionSerial()
        {
            Thread thread = new Thread(() =>
            {
                try
                {
                    string result = "";
                    string JsonStr ="'"+SystemConfigBLL.GetSingle("CompanyInfo").Value+"'";
#if DEBUG
                    Uri uri = new Uri("http://xxxxx/Api/Customer/Report");
#else
                    Uri uri = new Uri("http://xxxxx/Api/Customer/Report");
#endif

                    //向接口发送数据 并得到返回值
                    HttpWebRequest objRequest = (HttpWebRequest)WebRequest.Create(uri);
                    objRequest.Method = "POST";
                    objRequest.ContentType = "application/json";
                    byte[] byteData = Encoding.UTF8.GetBytes(JsonStr);
                    objRequest.ContentLength = byteData.Length;
                    objRequest.GetRequestStream().Write(byteData, 0, byteData.Length);

                    HttpWebResponse objResponse = (HttpWebResponse)objRequest.GetResponse();
                    using (StreamReader sr = new StreamReader(objResponse.GetResponseStream()))
                    {
                        result = sr.ReadToEnd();
                        sr.Close();
                    }

                    ResponseResults<CustomerCode> responseResults = JsonConvert.DeserializeObject<ResponseResults<CustomerCode>>(result);

                    if (!string.IsNullOrEmpty(responseResults.content.code))
                    {
                        if (string.IsNullOrEmpty(SystemConfigBLL.GetSingle("CustomerCode").Value))
                        {
                            int res = SystemConfigBLL.Update("CustomerCode", responseResults.content.code);
                        }
                    }
                }
                catch
                {

                }

        });
            thread.IsBackground = true;
            thread.Start();
        }