C# ftp 如何判断服务器上的文件夹是否存在

Question

当有文件夹重复时，新那会出错，我如何判断这个文件夹是否存在呢，我知道一个是新那时添加异常处理，有没有其它好的办法呢？

Answer 1

        public bool CheckFileExist(string ftpFilePath)
        {
            FtpWebRequest ftpWebRequest = null;
            WebResponse webResponse = null;
            StreamReader reader = null;            try
            {
                int s = ftpFilePath.LastIndexOf('/');
                if (s == ftpFilePath.Length - 1)
                {
                    ftpFilePath = ftpFilePath.Substring(0, ftpFilePath.Length - 1);
                    s = ftpFilePath.LastIndexOf('/');
                }                string ftpFileName = ftpFilePath.Substring(s + 1, ftpFilePath.Length - s - 1);
                string uri = GetFtpUri(ftpHostAddress, ftpPort, ftpFilePath.Substring(0, s + 1));                ftpWebRequest = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));
                ftpWebRequest.Credentials = new NetworkCredential(ftpUser, ftpPassword);
                ftpWebRequest.Method = WebRequestMethods.Ftp.ListDirectory;
                ftpWebRequest.UsePassive = false;
                ftpWebRequest.KeepAlive = false;
                webResponse = ftpWebRequest.GetResponse();
                reader = new StreamReader(webResponse.GetResponseStream());
                string line = reader.ReadLine();
                while (line != null)
                {
                    if (line == ftpFileName)
                    {
                        return true;
                    }
                    line = reader.ReadLine();
                }
            }
            catch (Exception e)
            {
                throw e;
            }
            finally
            {
                if (reader != null)
                {
                    reader.Close();
                }
                if (webResponse != null)
                {
                    webResponse.Close();
                }
            }
            return false;
        }

Answer 2

WebRequestMethods.Ftp.ListDirectory
获取FTP请求的响应流中的字符串

Answer 3

本来想用ListDirectory，然后分析一下
后没时间研究
我也用异常处理解决的期待更好的办法