HttpClient Post Get请求方法，留在以后可能会用到

   /// <summary>
        /// Post请求返回实体
        /// </summary>
        /// <param name="url">请求地址</param>
        /// <param name="postData">请求数据</param>
        /// <returns>实体</returns>
        public static T PostResponse<T>(string url, object obj)
        {
            HttpClient httpClient = new HttpClient(new HttpClientHandler() { AutomaticDecompression = DecompressionMethods.GZip });
            HttpResponseMessage response = null;
            try
            {

                httpClient.MaxResponseContentBufferSize = ;
                httpClient.DefaultRequestHeaders.Add("user-agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/36.0.1985.143 Safari/537.36");
                httpClient.CancelPendingRequests();
                httpClient.DefaultRequestHeaders.Clear();
                string postData = JsonConvertTool.SerializeObject(obj);
                HttpContent httpContent = new StringContent(postData);

                httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");
                T result = default(T);
                Task<HttpResponseMessage> taskResponse = httpClient.PostAsync(url, httpContent);
                taskResponse.Wait();
                response = taskResponse.Result;

                if (response.IsSuccessStatusCode)
                {

                    Task<System.IO.Stream> taskStream = response.Content.ReadAsStreamAsync();
                    taskStream.Wait();
                    System.IO.Stream dataStream = taskStream.Result;
                    System.IO.StreamReader reader = new System.IO.StreamReader(dataStream);
                    string s = reader.ReadToEnd();

                    result = JsonConvertTool.DeserializeObject<T>(s);
                }

                return result;

            }
            catch
            {
                return default(T);
            }
            finally
            {
                if (response != null)
                {
                    response.Dispose();
                }
                if (httpClient != null)
                {
                    httpClient.Dispose();

                }
            }
        }

        /// <summary>
        /// 根据Url地址Get请求返回实体
        /// </summary>
        /// <param name="url">请求的地址</param>
        /// <returns>实体</returns>
        public static T GetResponse<T>(string url)
        {
            HttpClient httpClient = new HttpClient(new HttpClientHandler() { AutomaticDecompression = DecompressionMethods.GZip });
            HttpResponseMessage response = null;
            try
            {

                httpClient.MaxResponseContentBufferSize = 256000;
                httpClient.DefaultRequestHeaders.Add("user-agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/36.0.1985.143 Safari/537.36");
                httpClient.CancelPendingRequests();
                httpClient.DefaultRequestHeaders.Clear();
                httpClient.DefaultRequestHeaders.Accept.Add(
                   new MediaTypeWithQualityHeaderValue("application/json"));

                Task<HttpResponseMessage> taskResponse = httpClient.GetAsync(url);
                taskResponse.Wait();
                T result = default(T);
                response = taskResponse.Result;

                if (response.IsSuccessStatusCode)
                {

                    Task<System.IO.Stream> taskStream = response.Content.ReadAsStreamAsync();
                    taskStream.Wait();
                    System.IO.Stream dataStream = taskStream.Result;
                    System.IO.StreamReader reader = new System.IO.StreamReader(dataStream);
                    string s = reader.ReadToEnd();

                    result = JsonConvertTool.DeserializeObject<T>(s);

                }
                              return result;

            }
            catch
            {
                return default(T);
            }
            finally
            {
                if (response != null)
                {
                    response.Dispose();
                }
                if (httpClient != null)
                {
                    httpClient.Dispose();

                }

            }
        }