C# Get 带body

            try
            {
                //System.GC.Collect();
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL);
                request.Proxy = null;
                request.KeepAlive = false;
                request.Method = "GET";
                request.ContentType = "application/json; charset=UTF-8";
                request.AutomaticDecompression = DecompressionMethods.GZip;
                string Data = "{"CorpId":"300014"}";
                //if (Data != "")
                //{
                    var type = request.GetType();
                    var currentMethod = type.GetProperty("CurrentMethod", BindingFlags.NonPublic | BindingFlags.Instance).GetValue(request);
                    var methodType = currentMethod.GetType();
                    methodType.GetField("ContentBodyNotAllowed", BindingFlags.NonPublic | BindingFlags.Instance).SetValue(currentMethod, false);

                    using (var streamWriter = new StreamWriter(request.GetRequestStream()))
                    {
                        streamWriter.Write(Data);
                    }
                //}

                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                Stream myResponseStream = response.GetResponseStream();
                StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.UTF8);
                string retString = myStreamReader.ReadToEnd();

                myStreamReader.Close();
                myResponseStream.Close();

                if (response != null)
                {
                    response.Close();
                }
                if (request != null)
                {
                    request.Abort();
                }

                return retString;
            }
            catch (Exception ex)
            {
                return ("ERROR:" + ex.Message + ":::" + ex.InnerException.Message);
            }