C# FTP 工具类

    public class FtpTool
    {
        string ftpServerIP; //ftp服务器地址
        string ftpRemotePath; //ftp目录
        string ftpUserID; //登录用户
        string ftpPassword; //登录密码
        string ftpURI; //访问资源地址

        public FtpTool(string _ftpServerIP, string _ftpRemotePath, string _ftpUserID, string _ftpPassword)
        {
            ftpServerIP = _ftpServerIP;
            ftpRemotePath = _ftpRemotePath;
            ftpUserID = _ftpUserID;
            ftpPassword = _ftpPassword;
            ftpURI = "ftp://" + ftpServerIP + "/" + ftpRemotePath + "/";
        }

        /// <summary>
        /// 上传文件
        /// </summary>
        /// <param name="filename">文件名</param>
        public void Upload(string filename)
        {
            FileInfo fileInfo = new FileInfo(filename);
            string uri = ftpURI + fileInfo.Name;
            FtpWebRequest reqFTP;

            reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));
            reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
            reqFTP.KeepAlive = false;
            reqFTP.Method = WebRequestMethods.Ftp.UploadFile;
            reqFTP.UseBinary = true;
            reqFTP.ContentLength = fileInfo.Length;

            int buffLength = 2048;
            byte[] buff = new byte[buffLength];
            int contentLen;
            FileStream fs = fileInfo.OpenRead();

            try
            {
                Stream strm = reqFTP.GetRequestStream();
                contentLen = fs.Read(buff, 0, buffLength);
                while (contentLen != 0)
                {
                    strm.Write(buff, 0, contentLen);
                    contentLen = fs.Read(buff, 0, buffLength);
                }
                strm.Close();
                fs.Close();
            }
            catch (Exception ex)
            {
                Console.WriteLine("出现异常：" + ex.Message);

            }
        }

        /// <summary>
        /// 下载文件
        /// </summary>
        /// <param name="filepath">本地存储目录</param>
        /// <param name="fileName">下载的文件名</param>
        public void Download(string filepath, string fileName)
        {
            FtpWebRequest reqFtp;
            try
            {
                FileStream outputStream = new FileStream(filepath + "\\" + fileName, FileMode.Create);
                reqFtp = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + fileName));
                reqFtp.Method = WebRequestMethods.Ftp.DownloadFile;
                reqFtp.Credentials = new NetworkCredential(ftpUserID, ftpPassword);

                FtpWebResponse response = (FtpWebResponse)reqFtp.GetResponse();
                Stream ftpStream = response.GetResponseStream();
                long cl = response.ContentLength;
                int buffSize = 2048;
                int readCount;
                byte[] buffer = new byte[buffSize];

                readCount = ftpStream.Read(buffer, 0, buffSize);
                while (readCount > 0)
                {
                    outputStream.Write(buffer, 0, buffSize);
                    readCount = ftpStream.Read(buffer, 0, buffSize);
                }
                ftpStream.Close();
                outputStream.Close();
                response.Close();
            }
            catch (Exception ex)
            {
                Console.WriteLine("出现异常：" + ex.Message);

            }
        }

        /// <summary>
        /// 获取文件（含文件夹）列表，详细信息包括文件名，文件大小，创建日期等
        /// </summary>
        /// <returns></returns>
        public string[] GetFilesDetailList()
        {
            string[] downloadFiles;
            try
            {
                StringBuilder result = new StringBuilder();
                FtpWebRequest ftp;
                ftp = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI));
                ftp.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                ftp.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
                WebResponse response = ftp.GetResponse();
                StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.Default);

                string line = reader.ReadLine();

                while (line != null)
                {
                    result.Append(line);
                    result.Append("\n");
                    line = reader.ReadLine();
                }
                result.Remove(result.ToString().LastIndexOf("\n"), 1);
                reader.Close();
                response.Close();
                return result.ToString().Split('\n');
            }
            catch (Exception ex)
            {
                downloadFiles = null;
                Console.WriteLine("异常：" + ex.Message);
                return downloadFiles;
            }
        }

        /// <summary>
        /// 获取文件列表
        /// </summary>
        /// <param name="mask"></param>
        /// <returns></returns>
        public string[] GetFileList(string mask)
        {
            string[] downloadFiles;
            StringBuilder result = new StringBuilder();
            FtpWebRequest reqFTP;
            try
            {
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI));
                reqFTP.UseBinary = true;
                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                reqFTP.Method = WebRequestMethods.Ftp.ListDirectory;
                WebResponse response = reqFTP.GetResponse();
                StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.Default);

                string line = reader.ReadLine();
                while (line != null)
                {
                    if (mask.Trim() != string.Empty && mask.Trim() != "*.*")
                    {

                        string mask_ = mask.Substring(0, mask.IndexOf("*"));
                        if (line.Substring(0, mask_.Length) == mask_)
                        {
                            result.Append(line);
                            result.Append("\n");
                        }
                    }
                    else
                    {
                        result.Append(line);
                        result.Append("\n");
                    }
                    line = reader.ReadLine();
                }
                result.Remove(result.ToString().LastIndexOf('\n'), 1);
                reader.Close();
                response.Close();
                return result.ToString().Split('\n');
            }
            catch (Exception ex)
            {
                downloadFiles = null;
                if (ex.Message.Trim() != "远程服务器返回错误: (550) 文件不可用(例如，未找到文件，无法访问文件)。")
                {
                    Console.WriteLine("异常："+ ex.Message);
                }
                return downloadFiles;
            }
        }

    }