class DirectoryItem        {            public Uri BaseUri;            public string AbsolutePath            { get { return string.Format("{0}/{1}", BaseUri, Name); } }            public DateTime DateCreated;            public bool IsDirectory;            public string Name;            public List<DirectoryItem> Items;            public override string ToString() { return Name; }        }        internal enum enumFolderListFMT { UNIX, DOS_IIS };        internal enum enumFTPPlatform { WindowsServer2008, ServU}        /// <summary>        /// 获取目录信息（包含文件夹，文件）        /// </summary>        /// <param name="address"></param>        /// <param name="username"></param>        /// <param name="password"></param>        /// <returns></returns>        static List<DirectoryItem> GetDirectoryInformation(string addr2, string username, string password)        {            var address = addr2.EndsWith("/") ? addr2.Substring(0, addr2.Length - 1) : addr2;//去除最后一个斜杠            FtpWebRequest request = (FtpWebRequest)FtpWebRequest.Create(address);            request.Method = WebRequestMethods.Ftp.ListDirectoryDetails;            request.Credentials = new NetworkCredential(username, password);            request.UsePassive = true;            request.UseBinary = true;            request.KeepAlive = false;            string[] list = null;            using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())            using (StreamReader reader = new StreamReader(response.GetResponseStream()))            {                list = reader.ReadToEnd().Split(new string[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries);            }            //unix or dos_iis format?            enumFolderListFMT folderFormat = enumFolderListFMT.UNIX;            int dir_pos = 0;            bool found = false;            foreach (var item in list)            {                if (item.ToLower().Contains("<dir>"))                {                    folderFormat = enumFolderListFMT.DOS_IIS;                    dir_pos = item.ToLower().IndexOf("<dir>");                    found = true;                    break;                }            }            if (!found && list.Length > 0 && list[0].ToLower()[0] != ‘d‘ && list[0].ToLower()[0] != ‘-‘)            {                folderFormat = enumFolderListFMT.DOS_IIS;            }            enumFTPPlatform ftpPlatform = enumFTPPlatform.WindowsServer2008;            if (folderFormat == enumFolderListFMT.UNIX)            {                if (list.Length > 0 && list[0].Substring(0, 10).ToLower().Count(c => c == ‘-‘) < 3)                    ftpPlatform = enumFTPPlatform.WindowsServer2008;                else                    ftpPlatform = enumFTPPlatform.ServU;            }            List<DirectoryItem> returnValue = http://www.mamicode.com/new List<DirectoryItem>();            if (folderFormat == enumFolderListFMT.DOS_IIS)            {                foreach (var item in list)                {                    if (item.ToLower().Contains("<dir>"))                    {                        var dir = item.Substring(dir_pos + 5).Trim();                        if (dir == "." || dir == "..") continue;                        var di = new DirectoryItem();                        di.BaseUri = new Uri(address);                        //di.DateCreated = dateTime;                        di.IsDirectory = true;                        di.Name = dir;                        //Debug.WriteLine(di.AbsolutePath);                        di.Items = GetDirectoryInformation(di.AbsolutePath, username, password);                        returnValue.Add(di);                    }                    else                    {                        string filename = "";                        if(found)                            filename = item.Substring(dir_pos + 14).Trim();                        else                            filename = item.Substring(39).Trim();                        var di = new DirectoryItem();                        di.BaseUri = new Uri(address);                        di.IsDirectory = false;                        di.Name = filename;                        di.Items = null;                        returnValue.Add(di);                    }                }            }            else if (folderFormat == enumFolderListFMT.UNIX)            {                var pos = ftpPlatform == enumFTPPlatform.WindowsServer2008 ? 58 : 54;                foreach (var item in list)                {                    if (item.Substring(0, 1).ToLower() == "d")                    {                        var dir = item.Substring(pos).Trim();                        if (dir == "." || dir == "..") continue;                        var di = new DirectoryItem();                        di.BaseUri = new Uri(address);                        di.IsDirectory = true;                        di.Name = dir;                        di.Items = GetDirectoryInformation(di.AbsolutePath, username, password);                        returnValue.Add(di);                    }                    else if (item.Substring(0, 1).ToLower() == "-")                    {                        var filename = item.Substring(pos).Trim();                        var di = new DirectoryItem();                        di.BaseUri = new Uri(address);                        di.IsDirectory = false;                        di.Name = filename;                        di.Items = null;                        returnValue.Add(di);                    }                }            }            return returnValue;        }        /// <summary>        /// 下载文件        /// </summary>        /// <param name="filePath">下载到哪里</param>        /// <param name="outputFilename">下载后的文件名</param>        /// <param name="fileName">服务器上的文件名</param>        /// <param name="ftpServerIP">服务器全路径，注意最后的斜线不可少。如ftp://172.18.1.152:8009/aaa/</param>        /// <param name="ftpUserID">访问的用户名</param>        /// <param name="ftpPassword">访问的密码</param>        /// <returns></returns>        public int DownloadFile(string filePath, string outputFilename, string fileName, string ftpServerIP, string ftpUserID, string ftpPassword)        {            FtpWebRequest reqFTP;            try            {                //filePath = < <The full path where the file is to be created.>>,                 //fileName = < <Name of the file to be created(Need not be the name of the file on FTP server).>>                 FileStream outputStream = new FileStream(filePath + "\\" + outputFilename, FileMode.Create);                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpServerIP + fileName));                reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;                reqFTP.UseBinary = true;                reqFTP.KeepAlive = false;                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();                Stream ftpStream = response.GetResponseStream();                long cl = response.ContentLength;                int bufferSize = 2048;                int readCount;                byte[] buffer = new byte[bufferSize];                readCount = ftpStream.Read(buffer, 0, bufferSize);                while (readCount > 0)                {                    outputStream.Write(buffer, 0, readCount);                    readCount = ftpStream.Read(buffer, 0, bufferSize);                }                ftpStream.Close();                outputStream.Close();                response.Close();                return 0;            }            catch (Exception ex)            {                // Logging.WriteError(ex.Message + ex.StackTrace);                System.Windows.Forms.MessageBox.Show(ex.Message);                return -2;            }        }