#region 下载文件        /// 
        /// 从FTP服务器下载文件，指定本地路径和本地文件名,20120817,ylh        /// 
        ///  要下载文件所在ftp上的完整路径，如ftp://192.168.0.111/2012-08-17/yinluhui.xml        /// 要下载文件的文件名,如yinluhui.xml        /// 本地路径,如D:\ftp临时文件\20120817        public bool DownFtpToLocation(String ftpPath, String ftpFile, String LocalPath)        {            byte[] bt = null;            try            {                //if (!IsValidFileChars(RemoteFileName) || !IsValidFileChars(LocalFileName) || !IsValidPathChars(LocalPath))                //{                //    throw new Exception("非法文件名或目录名!");                //}                if (Directory.Exists(LocalPath) == false)                {                    Directory.CreateDirectory(LocalPath);                }                string LocalFullPath = Path.Combine(LocalPath, ftpFile);                //if (File.Exists(LocalFullPath))                //{                //    throw new Exception("当前路径下已经存在同名文件！");                //}                bt = DownloadFile(ftpPath, LocalPath);                if (bt != null)                {                    FileStream stream = new FileStream(LocalFullPath, FileMode.Create);                    stream.Write(bt, 0, bt.Length);                    stream.Flush();                    stream.Close();                    return true;                }                else                {                    return false;                }            }            catch (Exception ep)            {                //ErrorMsg = ep.ToString();                throw ep;            }        }        /// 
        /// 从FTP服务器下载文件，返回文件二进制数据        /// 
        public byte[] DownloadFile(String ftpPath, String LocalPath)        {            try            {                //if (!IsValidFileChars(RemoteFileName))                //{                //    throw new Exception("非法文件名或目录名!");                //}                FtpWebRequest ftpRequest = (FtpWebRequest)WebRequest.Create(ftpPath);                ftpRequest.Credentials = new NetworkCredential(_account, _pwd);//登陆ftp的用户名，密码                ftpRequest.Method = WebRequestMethods.Ftp.DownloadFile;                FtpWebResponse Response = (FtpWebResponse)ftpRequest.GetResponse();                Stream Reader = Response.GetResponseStream();                MemoryStream mem = new MemoryStream(1024 * 500);                byte[] buffer = new byte[1024];                int bytesRead = 0;                int TotalByteRead = 0;                while (true)                {                    bytesRead = Reader.Read(buffer, 0, buffer.Length);                    TotalByteRead += bytesRead;                    if (bytesRead == 0)                        break;                    mem.Write(buffer, 0, bytesRead);                }                if (mem.Length > 0)                {                    return mem.ToArray();                }                else                {                    return null;                }            }            catch (Exception ep)            {                throw ep;            }        }        #endregion