/// <summary>

    /// SFTP操作类

    /// </summary>

    public class SFTPHelper

    {

        #region 字段或属性

        private SftpClient sftp;

        private string cmsimagesIP = ConfigurationManager.AppSettings["cmsimagesIP"].ToString();

        private string cmsimagesName = ConfigurationManager.AppSettings["cmsimagesName"].ToString();

        private string cmsimagesPwd = ConfigurationManager.AppSettings["cmsimagesPwd"].ToString();

        /// <summary>

        /// SFTP连接状态

        /// </summary>

        public bool Connected { get { return sftp.IsConnected; } }

        #endregion

        #region 构造

        /// <summary>

        /// 构造

        /// </summary>

        public SFTPHelper()

        {

            sftp = new SftpClient(cmsimagesIP, , cmsimagesName, cmsimagesPwd);

        }

        #endregion

        #region 连接SFTP

        /// <summary>

        /// 连接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("连接SFTP失败，原因：{0}", ex.Message));

                throw new Exception(string.Format("连接SFTP失败，原因：{0}", ex.Message));

            }

        }

        #endregion

        #region 断开SFTP

        /// <summary>

        /// 断开SFTP

        /// </summary>

        public void Disconnect()

        {

            try

            {

                if (sftp != null && Connected)

                {

                    sftp.Disconnect();

                }

            }

            catch (Exception ex)

            {

                // TxtLog.WriteTxt(CommonMethod.GetProgramName(), string.Format("断开SFTP失败，原因：{0}", ex.Message));

                throw new Exception(string.Format("断开SFTP失败，原因：{0}", ex.Message));

            }

        }

        #endregion

        #region SFTP上传文件

        /// <summary>

        /// SFTP上传文件

        /// </summary>

        /// <param name="localPath">本地路径</param>

        /// <param name="remotePath">远程路径</param>

        public void Put(string localPath, string remotePath, string fileName)

        {

            try

            {

                using (var file = File.OpenRead(localPath))

                {

                    Connect();

                    //判断路径是否存在

                    if (!sftp.Exists(remotePath))

                    {

                        sftp.CreateDirectory(remotePath);

                    }

                    sftp.UploadFile(file, remotePath + fileName);

                    Disconnect();

                }

            }

            catch (Exception ex)

            {

                throw new Exception(string.Format("SFTP文件上传失败，原因：{0}", ex.Message));

            }

        }

        #endregion

        #region SFTP获取文件

        /// <summary>

        /// SFTP获取文件

        /// </summary>

        /// <param name="remotePath">远程路径</param>

        /// <param name="localPath">本地路径</param>

        public void Get(string remotePath, string localPath)

        {

            try

            {

                Connect();

                var byt = sftp.ReadAllBytes(remotePath);

                Disconnect();

                File.WriteAllBytes(localPath, byt);

            }

            catch (Exception ex)

            {

                throw new Exception(string.Format("SFTP文件获取失败，原因：{0}", ex.Message));

            }

        }

        #endregion

        #region 获取SFTP文件列表

        /// <summary>

        /// 获取SFTP文件列表

        /// </summary>

        /// <param name="remotePath">远程目录</param>

        /// <param name="fileSuffix">文件后缀</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 + ) && fileSuffix == name.Substring(name.Length - fileSuffix.Length))

                    {

                        objList.Add(name);

                    }

                }

                return objList;

            }

            catch (Exception ex)

            {

                // TxtLog.WriteTxt(CommonMethod.GetProgramName(), string.Format("SFTP文件列表获取失败，原因：{0}", ex.Message));

                throw new Exception(string.Format("SFTP文件列表获取失败，原因：{0}", ex.Message));

            }

        }

        #endregion

        #region 移动SFTP文件

        /// <summary>

        /// 移动SFTP文件

        /// </summary>

        /// <param name="oldRemotePath">旧远程路径</param>

        /// <param name="newRemotePath">新远程路径</param>

        public void Move(string oldRemotePath, string newRemotePath)

        {

            try

            {

                Connect();

                sftp.RenameFile(oldRemotePath, newRemotePath);

                Disconnect();

            }

            catch (Exception ex)

            {

                throw new Exception(string.Format("SFTP文件移动失败，原因：{0}", ex.Message));

            }

        }

        #endregion

        #region 删除SFTP文件

        public void Delete(string remoteFile)

        {

            try

            {

                Connect();

                sftp.Delete(remoteFile);

                Disconnect();

            }

            catch (Exception ex)

            {

                throw new Exception(string.Format("SFTP文件删除失败，原因：{0}", ex.Message));

            }

        }

        #endregion

        #region 创建目录

        /// <summary>

        /// 循环创建目录

        /// </summary>

        /// <param name="remotePath">远程目录</param>

        private void CreateDirectory(string remotePath)

        {

            try

            {

                string[] paths = remotePath.Split(new char[] { '/' }, StringSplitOptions.RemoveEmptyEntries);

                string curPath = "/";

                for (int i = ; i < paths.Length; i++)

                {

                    curPath += paths[i];

                    if (!sftp.Exists(curPath))

                    {

                        sftp.CreateDirectory(curPath);

                    }

                    if (i < paths.Length - )

                    {

                        curPath += "/";

                    }

                }

            }

            catch (Exception ex)

            {

                throw new Exception(string.Format("创建目录失败，原因：{0}", ex.Message));

            }

        }

        #endregion

    }

　　　　 /// <summary>

        /// 上传图片

        /// </summary>

        /// <param name="file"></param>

        /// <returns></returns>

        public ActionResult UploadImage(int HotelID, HttpPostedFileBase file)

        {

            if (file == null)

            {

                return Json(new { code = , message = "请先选择图片" });

            }

            string batchNo = System.Guid.NewGuid().ToString();

            string fileWebPath = "/upload/" + HotelID + "/";

            string directory = Request.MapPath("~" + fileWebPath);

            string fileName = batchNo + Path.GetExtension(file.FileName);

            if (!Directory.Exists(directory))

            {

                Directory.CreateDirectory(directory);

            }

            string fileFullName = Path.Combine(directory, fileName);

            try

            {

                file.SaveAs(fileFullName);

                //上传SFTP

                SFTPHelper sftp = new SFTPHelper();

                sftp.Put(fileFullName, "/home/cmsimages/ads/cmsimages/choice/" + HotelID + "/", fileName);

                return Json(new { code = , message = fileWebPath + fileName });

            }

            catch (Exception e)

            {

                return Json(new { code = , message = e.Message });

            }

        }