/// <summary>  /// SFTP操作類  /// </summary>  public class SFTPHelper  {    #region 字段或屬性    private SftpClient sftp;    /// <summary>    /// SFTP連接狀態    /// </summary>    public bool Connected { get { return sftp.IsConnected; } }    #endregion    #region 構造    /// <summary>    /// 構造    /// </summary>    /// <param name="ip">IP</param>    /// <param name="port">端口</param>    /// <param name="user">用戶名</param>    /// <param name="pwd">密碼</param>    public SFTPHelper(string ip, string port, string user, string pwd)    {      sftp = new SftpClient(ip, Int32.Parse(port), user, pwd);    }    #endregion    #region 連接SFTP    /// <summary>    /// 連接SFTP    /// </summary>    /// <returns>true成功</returns>    public bool Connect()    {      try      {        if (!Connected)        {          sftp.Connect();        }        return true;      }      catch (Exception ex)      {        // TxtLog.WriteTxt(CommonMethod.GetProgramName(), string.Format("連接SFTP失敗，原因：{0}", ex.Message));        throw new Exception(string.Format("連接SFTP失敗，原因：{0}", ex.Message));      }    }    #endregion    #region 斷開SFTP    /// <summary>    /// 斷開SFTP    /// </summary>     public void Disconnect()    {      try      {        if (sftp != null && Connected)        {          sftp.Disconnect();        }      }      catch (Exception ex)      {        // TxtLog.WriteTxt(CommonMethod.GetProgramName(), string.Format("斷開SFTP失敗，原因：{0}", ex.Message));        throw new Exception(string.Format("斷開SFTP失敗，原因：{0}", ex.Message));      }    }    #endregion    #region SFTP上傳文件    /// <summary>    /// SFTP上傳文件    /// </summary>    /// <param name="localPath">本地路徑</param>    /// <param name="remotePath">遠程路徑</param>    public void Put(string localPath, string remotePath)    {      try      {        using (var file = File.OpenRead(localPath))        {          Connect();          sftp.UploadFile(file, remotePath);          Disconnect();        }      }      catch (Exception ex)      {        // TxtLog.WriteTxt(CommonMethod.GetProgramName(), string.Format("SFTP文件上傳失敗，原因：{0}", ex.Message));        throw new Exception(string.Format("SFTP文件上傳失敗，原因：{0}", ex.Message));      }    }    #endregion    #region SFTP獲取文件    /// <summary>    /// SFTP獲取文件    /// </summary>    /// <param name="remotePath">遠程路徑</param>    /// <param name="localPath">本地路徑</param>    public void Get(string remotePath, string localPath)    {      try      {        Connect();        var byt = sftp.ReadAllBytes(remotePath);        Disconnect();        File.WriteAllBytes(localPath, byt);      }      catch (Exception ex)      {        // TxtLog.WriteTxt(CommonMethod.GetProgramName(), string.Format("SFTP文件獲取失敗，原因：{0}", ex.Message));        throw new Exception(string.Format("SFTP文件獲取失敗，原因：{0}", ex.Message));      }    }    #endregion    #region 刪除SFTP文件    /// <summary>    /// 刪除SFTP文件     /// </summary>    /// <param name="remoteFile">遠程路徑</param>    public void Delete(string remoteFile)    {      try      {        Connect();        sftp.Delete(remoteFile);        Disconnect();      }      catch (Exception ex)      {        // TxtLog.WriteTxt(CommonMethod.GetProgramName(), string.Format("SFTP文件刪除失敗，原因：{0}", ex.Message));        throw new Exception(string.Format("SFTP文件刪除失敗，原因：{0}", ex.Message));      }    }    #endregion    #region 獲取SFTP文件列表    /// <summary>    /// 獲取SFTP文件列表    /// </summary>    /// <param name="remotePath">遠程目錄</param>    /// <param name="fileSuffix">文件后綴</param>    /// <returns></returns>    public ArrayList GetFileList(string remotePath, string fileSuffix)    {      try      {        Connect();        var files = sftp.ListDirectory(remotePath);        Disconnect();        var objList = new ArrayList();        foreach (var file in files)        {          string name = file.Name;          if (name.Length > (fileSuffix.Length + 1) && fileSuffix == name.Substring(name.Length - fileSuffix.Length))          {            objList.Add(name);          }        }        return objList;      }      catch (Exception ex)      {        // TxtLog.WriteTxt(CommonMethod.GetProgramName(), string.Format("SFTP文件列表獲取失敗，原因：{0}", ex.Message));        throw new Exception(string.Format("SFTP文件列表獲取失敗，原因：{0}", ex.Message));      }    }    #endregion    #region 移動SFTP文件    /// <summary>    /// 移動SFTP文件    /// </summary>    /// <param name="oldRemotePath">舊遠程路徑</param>    /// <param name="newRemotePath">新遠程路徑</param>    public void Move(string oldRemotePath, string newRemotePath)    {      try      {        Connect();        sftp.RenameFile(oldRemotePath, newRemotePath);        Disconnect();      }      catch (Exception ex)      {        // TxtLog.WriteTxt(CommonMethod.GetProgramName(), string.Format("SFTP文件移動失敗，原因：{0}", ex.Message));        throw new Exception(string.Format("SFTP文件移動失敗，原因：{0}", ex.Message));      }    }    #endregion  }