从ftp服务器下载某些文件后，Renci.SshNe的DownloadFile挂起

Question

我有窗口服务，可以从ftp服务器下载文件，下面是下载文件的代码。但是它会下载4-5个文件，然后在此行停止-'sftp.DownloadFile（remoteDirectory + remoteFileName，file1）'。我正在使用Renci.SshNet ddl。如果停止，如何恢复下载？如果您能帮助我，那就太好了！

                    if (sftp.Exists(remoteDirectory))
                    {
                        var files = sftp.ListDirectory(remoteDirectory);

                        var filterfiles = (from a in files
                                           where (a.Name.StartsWith(FileInitial))
                                           select a).ToList();



                        foreach (var file in filterfiles)
                        {


                            string remoteFileName = file.Name;
                            if ((!file.Name.StartsWith(".")))
                            {
                                string[] arr1 = remoteFileName.Split('_');


                                if (arr1.Length > 2)
                                {


                                    using (Stream file1 = File.OpenWrite(localDirectory + remoteFileName))
                                    {
                                        try
                                        {

                                            sftp.DownloadFile(remoteDirectory + remoteFileName, file1);
                                        }
                                        catch(Exception Ex)
                                        {


                                        }


                                    }



                                }
                            }
                        }


                    }