ftp 访问 加密：使用显示的FTP Over TLS 无响应

Question

 string url = ftpRootURL + ftpPath;
                ftpWebRequest = (FtpWebRequest)FtpWebRequest.Create(new Uri(url));
                ftpWebRequest.Credentials = new NetworkCredential(ftpUser, ftpPassword);
                ftpWebRequest.Method = WebRequestMethods.Ftp.ListDirectory;
                if (bEnableSsl)
                {
                    ftpWebRequest.EnableSsl = true;               
               }
                ftpWebRequest.KeepAlive = false;
                webResponse = ftpWebRequest.GetResponse();
                reader = new StreamReader(webResponse.GetResponseStream());
                //这里读取==null  在访问不加密的FTP 的时候正常
                string line = reader.ReadLine();
                while (line != null)
                {
                    list.Add(line);
                    line = reader.ReadLine();
                }

Answer 1

 //这里读取==null 在访问不加密的FTP 的时候正常
  string line = reader.ReadLine();