获取ftp服务器上指定文件夹的文件列表(包含文件大小)

/// <summary>
        /// 获取ftp服务器上指定文件夹的文件列表(包含文件大小)
        /// </summary>
        /// <param name="ServerIP"></param>
        /// <param name="USERID"></param>
        /// <param name="PassWord"></param>
        /// <param name="path"></param>
        /// <returns></returns>
        public Dictionary<string, int> GetFTPList(string ServerIP, string USERID, string PassWord, string path)
        {
            Dictionary<string, int> dic = new Dictionary<string, int>();
            if (path == null)
                path = "";
            FtpWebRequest reqFtp;
            try
            {
                reqFtp = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ServerIP + "/" + path));
                reqFtp.KeepAlive = false;
                reqFtp.UseBinary = true;   //指定ftp数据传输类型为 二进制
                reqFtp.Credentials = new NetworkCredential(USERID, PassWord);     //设置于ftp通讯的凭据
                reqFtp.Method = WebRequestMethods.Ftp.ListDirectoryDetails;      //指定操作方式
                WebResponse response = reqFtp.GetResponse();  //获取一个FTP响应
                StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding("GB2312"));   //读取响应流
                string line = reader.ReadLine();
                while (line != null)
                {
                    if (line != "." && line != "..")
                    {
                        int end = line.LastIndexOf(' ');
                        int start = line.IndexOf("    ");
                        string filename = line.Substring(end + 1);
                        if (filename.Contains("."))
                        {
                            line = line.Replace(filename, "");
                            dic.Add(filename.Trim(), int.Parse(line.Substring(start).Trim()));
                        }
                    }
                    line = reader.ReadLine();
                }
            }
            catch (Exception ex)
            {

            }

            return dic;
        }