C# Get 带body

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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); }