/// <summary>        /// FTP上传文件        /// </summary>        /// <param name="fileUpload">上传控件</param>        /// <param name="ftpServerIP">上传文件服务器IP</param>        /// <param name="ftpUserID">服务器用户名</param>        /// <param name="ftpPassword">服务器密码</param>        /// <returns></returns>        public  string Upload(FileUpload fileUpload, string ftpServerIP, string ftpUserID, string ftpPassword)        {            string filename = fileUpload.FileName;            string sRet = "上传成功！";            FileInfo fileInf = new FileInfo(fileUpload.PostedFile.FileName);            string uri = "ftp://" + ftpServerIP + "/" + filename;            FtpWebRequest reqFTP;            // 根据uri创建FtpWebRequest对象             reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));            // ftp用户名和密码            reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);            // 默认为true，连接不会被关闭            // 在一个命令之后被执行            reqFTP.KeepAlive = false;            // 指定执行什么命令            reqFTP.Method = WebRequestMethods.Ftp.UploadFile;            // 指定数据传输类型            reqFTP.UseBinary = true;            reqFTP.UsePassive = false;            // 上传文件时通知服务器文件的大小            reqFTP.ContentLength = fileInf.Length;            // 缓冲大小设置为2kb            int buffLength = 2048;            byte[] buff = new byte[buffLength];            int contentLen;            // 打开一个文件流 (System.IO.FileStream) 去读上传的文件            FileStream fs = fileInf.OpenRead();            try            {                // 把上传的文件写入流                Stream strm = reqFTP.GetRequestStream();                // 每次读文件流的2kb                contentLen = fs.Read(buff, 0, buffLength);                // 流内容没有结束                while (contentLen != 0)                {                    // 把内容从file stream 写入 upload stream                    strm.Write(buff, 0, contentLen);                    contentLen = fs.Read(buff, 0, buffLength);                }                // 关闭两个流                strm.Close();                fs.Close();            }            catch (Exception ex)            {                sRet = ex.Message;            }            return sRet;        }

/// <summary>        /// FTP下载文件        /// </summary>        /// <param name="userId">ftp用户名</param>        /// <param name="pwd">ftp密码</param>        /// <param name="ftpPath">ftp文件路径</param>        /// <param name="filePath">下载保存路径</param>        /// <param name="fileName">ftp文件名</param>        /// <returns></returns>        public string  Download(string userId, string pwd, string ftpPath, string filePath, string fileName)        {            string sRet = "下载成功！";              FtpWebRequest reqFTP;            try            {                FileStream outputStream = new FileStream(filePath + fileName, FileMode.Create);                // 根据uri创建FtpWebRequest对象                   reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpPath + fileName));                // 指定执行什么命令                  reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;                // 指定数据传输类型                  reqFTP.UseBinary = true;                reqFTP.UsePassive = false;                // ftp用户名和密码                  reqFTP.Credentials = new NetworkCredential(userId, pwd);                                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();                // 把下载的文件写入流                Stream ftpStream = response.GetResponseStream();                long cl = response.ContentLength;                // 缓冲大小设置为2kb                  int bufferSize = 2048;                int readCount;                byte[] buffer = new byte[bufferSize];                // 每次读文件流的2kb                  readCount = ftpStream.Read(buffer, 0, bufferSize);                while (readCount > 0)                {                    // 把内容从文件流写入                       outputStream.Write(buffer, 0, readCount);                    readCount = ftpStream.Read(buffer, 0, bufferSize);                }                //关闭两个流和ftp连接                ftpStream.Close();                outputStream.Close();                response.Close();            }            catch (Exception ex)            {                sRet=ex.Message;            }            //返回下载结果（是否下载成功）            return sRet;        }

/// <summary>        /// FTP删除文件        /// </summary>        /// <param name="ftpPath">ftp文件路径</param>        /// <param name="userId">ftp用户名</param>        /// <param name="pwd">ftp密码</param>        /// <param name="fileName">ftp文件名</param>        /// <returns></returns>        public string DeleteFile(string ftpPath,string userId,string pwd, string fileName)        {            string sRet = "删除成功！";               FtpWebResponse Respose = null;            FtpWebRequest reqFTP = null;            Stream localfile = null;            Stream stream = null;            try            {                //根据uri创建FtpWebRequest对象                  reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(string.Format(@"{0}{1}", ftpPath, fileName)));                //提供账号密码的验证                  reqFTP.Credentials = new NetworkCredential(userId, pwd);                    //默认为true是上传完后不会关闭FTP连接                  reqFTP.KeepAlive = false;                    //执行删除操作                reqFTP.Method = WebRequestMethods.Ftp.DeleteFile;                Respose = (FtpWebResponse)reqFTP.GetResponse();                  }                       catch (Exception ex)            {                sRet = ex.Message;            }            finally            {                //关闭连接跟流                if (Respose != null)                    Respose.Close();                if (localfile != null)                    localfile.Close();                if (stream != null)                    stream.Close();            }            //返回执行状态            return sRet;        }

/// <summary>        /// FTP创建目录         /// </summary>        /// <param name="dirName">目录名</param>        /// <param name="ftpServerIP">服务器地址</param>        /// <param name="ftpUserID">ftp用户名</param>        /// <param name="ftpPassword">ftp密码</param>        /// <returns></returns>        public  string CreateDir(string dirName, string ftpServerIP, string ftpUserID, string ftpPassword)        {            string sRet = "OK";            try            {                string uri =  ftpServerIP + "/" + dirName;                FtpWebRequest reqFTP;                // 根据uri创建FtpWebRequest对象                   reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));                // ftp用户名和密码                  reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);                // 默认为true，连接不会被关闭                  // 在一个命令之后被执行                  reqFTP.KeepAlive = false;                // 指定执行什么命令                  reqFTP.Method = WebRequestMethods.Ftp.MakeDirectory;                // 指定数据传输类型                  reqFTP.UseBinary = true;                FtpWebResponse respFTP = (FtpWebResponse)reqFTP.GetResponse();                respFTP.Close();            }            catch (Exception ex)            {                sRet = ex.Message;            }            return sRet;        }