从FTP上下载文件到本地

#region 下载文件

        /// <summary>

        /// 从FTP服务器下载文件，指定本地路径和本地文件名,20120817,ylh

        /// </summary>

        ///  <param name="ftpPath">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</param>

        /// <param name="ftpFile">要下载文件的文件名,如yinluhui.xml</param>

        /// <param name="LocalPath">本地路径,如D:\ftp临时文件\20120817</param>

        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;

            }

        }

        /// <summary>

        /// 从FTP服务器下载文件，返回文件二进制数据

        /// </summary>

        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