WebApi帮助类

 public class HttpClientBase
    {

         /// <summary>
        /// HttpClient实现Post请求
        /// </summary>

        protected  async Task<object> dooPost(string url, Dictionary<string, string> dic)
        {

            //设置HttpClientHandler的AutomaticDecompression
            var handler = new HttpClientHandler() { AutomaticDecompression = DecompressionMethods.GZip };
            //创建HttpClient（注意传入HttpClientHandler）
            using (var http = new HttpClient(handler))
            {
                //使用FormUrlEncodedContent做HttpContent
                var content = new FormUrlEncodedContent(dic);
                //await异步等待回应
                var response = await http.PostAsync(url, content);
                //确保HTTP成功状态值
                response.EnsureSuccessStatusCode();

                //await异步读取最后的JSON（注意此时gzip已经被自动解压缩了，因为上面的AutomaticDecompression = DecompressionMethods.GZip）
                string Result = await response.Content.ReadAsStringAsync();

                var Item = JsonConvert.DeserializeObject(Result);

                return Item;
            }
        }

      /// <summary>
      /// HttpClient实现Get请求
      /// </summary>
        protected  async Task<object> dooGet(string url)
      {

          //创建HttpClient（注意传入HttpClientHandler）
          var handler = new HttpClientHandler() { AutomaticDecompression = DecompressionMethods.GZip };
          string Result = "";
          using (var http = new HttpClient(handler))
          {
              //await异步等待回应
              var response = await http.GetAsync(url);
              //确保HTTP成功状态值
              response.EnsureSuccessStatusCode();

              //await异步读取最后的JSON（注意此时gzip已经被自动解压缩了，因为上面的AutomaticDecompression = DecompressionMethods.GZip）
              Result = await response.Content.ReadAsStringAsync();

            var Items=  JsonConvert.DeserializeObject(Result);

            return Items;
          }
      }

     /// <summary>
     /// HttpClient实现Put请求
     /// </summary>
        protected  async Task<object> dooPut(string url, Dictionary<string, string> dic)
     {

         //设置HttpClientHandler的AutomaticDecompression
         var handler = new HttpClientHandler() { AutomaticDecompression = DecompressionMethods.GZip };
           string Result="";
         //创建HttpClient（注意传入HttpClientHandler）
         using (var http = new HttpClient(handler))
         {
             //使用FormUrlEncodedContent做HttpContent
             var content = new FormUrlEncodedContent(dic);
             //await异步等待回应
             var response = await http.PutAsync(url, content);
             //确保HTTP成功状态值
             response.EnsureSuccessStatusCode();
             //await异步读取最后的JSON（注意此时gzip已经被自动解压缩了，因为上面的AutomaticDecompression = DecompressionMethods.GZip）
                 JavaScriptSerializer Serializer = new JavaScriptSerializer();
                 var items = Serializer.DeserializeObject(Result);
                 return items;
         }

     }

        /// <summary>
        /// HttpClient实现Get请求
        /// </summary>
        /// <param name="url"></param>
        /// <returns></returns>
        protected  object doGet(string url)
       {
           HttpClient client = new HttpClient();
           client.BaseAddress = new Uri(url);

           client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

           HttpResponseMessage response = client.GetAsync(url).Result;  // Blocking call（阻塞调用）! 

           var result = "";

           if (response.IsSuccessStatusCode)
           {
               result = response.Content.ReadAsStringAsync().Result;

              JavaScriptSerializer Serializer = new JavaScriptSerializer();
              var items = Serializer.DeserializeObject(result);
              return items;
           }
           return result;
       }

        /// <summary>
        /// HttpClient实现Post请求
        /// </summary>
        /// <param name="url"></param>
        /// <returns></returns>
        protected  object doPost(string url, Dictionary<string, string> dic,ref string  StatusCode)
       {

           HttpClient client = new HttpClient();
           client.BaseAddress = new Uri(url);

           JavaScriptSerializer jss = new JavaScriptSerializer();

           var content = new FormUrlEncodedContent(dic);
           client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
           HttpResponseMessage response = client.PostAsync(url, content).Result;
           var result = "";
           if (response.IsSuccessStatusCode)
           {
               result = response.Content.ReadAsStringAsync().Result;

               JavaScriptSerializer Serializer = new JavaScriptSerializer();
               var items = Serializer.DeserializeObject(result);
               //Dictionary<string, object> jarry = (Dictionary<string, object>)items;
               //obj ss = jarry["IsSuccess"];
               //string sate = jarry[0]["IsSuccess"].ToString();
               return items;
           }else
           {
               StatusCode = response.StatusCode.ToString(); ;
           }
           return result;
       }

        /// <summary>
        /// 转换URL
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public  static  string UrlEncode(string str)
       {
           StringBuilder sb = new StringBuilder();
           byte[] byStr = System.Text.Encoding.UTF8.GetBytes(str);
           for (int i = 0; i < byStr.Length; i++)
           {
               sb.Append(@"%" + Convert.ToString(byStr[i], 16));
           }
           return (sb.ToString());
       }
    }