c# 后台调用接口接收传过来的json

  public string GetRequestTest(string url) 
        {
            HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url);

            httpWebRequest.ContentType = "application/json";
            httpWebRequest.Method = "GET";
            httpWebRequest.Timeout = 20000;

            //byte[] btBodys = Encoding.UTF8.GetBytes(body);
            //httpWebRequest.ContentLength = btBodys.Length;
            //httpWebRequest.GetRequestStream().Write(btBodys, 0, btBodys.Length);

            HttpWebResponse httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
            StreamReader streamReader = new StreamReader(httpWebResponse.GetResponseStream());
            string responseContent = streamReader.ReadToEnd();
            httpWebResponse.Close();
            streamReader.Close();
            return responseContent;
           

        }