Question

我有这个FTP方法来检查目录是否存在。它在开始时工作正常，但现在，即使目录不存在，它仍然返回true。我尝试了很多东西，并设置断点来查看我可以用来确定目录是否存在的响应对象的属性。我也搜索了互联网，解决方案似乎对我不起作用。这是我的FTP方法。

public bool directoryExists(string directory)
            {
                /* Create an FTP Request */
                ftpRequest = (FtpWebRequest)FtpWebRequest.Create(host + "/" + directory);
                /* Log in to the FTP Server with the User Name and Password Provided */
                ftpRequest.Credentials = new NetworkCredential(user, pass);
                /* Specify the Type of FTP Request */
                ftpRequest.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
                try
                {
                    using (ftpRequest.GetResponse())
                    {
                        return true;
                    }
                    //var response = ftpRequest.GetResponse();
                    //if (response != null)
                    //    return true;
                    //else return false;
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.ToString());
                    return false;
                }

                /* Resource Cleanup */
                finally
                {
                    ftpRequest = null;
                }
            }

这是调用它的方法，即使目录不存在也返回true：

private string getDirectory(ref FtpClass ftp, string internalID)
        {
            string remoteSubPathDel = internalID + "\\trunk\\prod\\xml\\delete";
            string remoteSubPathUpdate = internalID + "\\trunk\\prod\\xml\\update";
            string remoteSubPathNew = internalID + "\\trunk\\prod\\xml\\new";
            if (ftp.directoryExists(remoteSubPathDel))
                return remoteSubPathDel;
            else if (ftp.directoryExists(remoteSubPathUpdate))
                return remoteSubPathUpdate;
            else if (ftp.directoryExists(remoteSubPathNew))
                return remoteSubPathNew;
            else
                return String.Empty;
        }

希望有人可以提供帮助。谢谢！：）

Answer 1

我找到了解决这个问题的方法。不是最好看，但它有效。

也许这可以帮助其他人解决与我相同的问题。

public bool directoryExists2(string directory, string mainDirectory)
        {
            try
            {
                var list = this.GetFileList(mainDirectory);
                if (list.Contains(directory))
                    return true;
                else
                    return false;
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                return false;
            }
        }

编辑：我收录了GetFileList方法以回应Ray Chang的评论

public string[] GetFileList(string path)
        {
            var ftpPath = host + "/" + path;
            var ftpUser = user;
            var ftpPass = pass;
            var result = new StringBuilder();
            try
            {
                var strLink = ftpPath;
                var reqFtp = (FtpWebRequest)WebRequest.Create(new Uri(strLink));
                reqFtp.UseBinary = true;
                reqFtp.Credentials = new NetworkCredential(ftpUser, ftpPass);
                reqFtp.Method = WebRequestMethods.Ftp.ListDirectory;
                reqFtp.Proxy = null;
                reqFtp.KeepAlive = false;
                reqFtp.UsePassive = true;
                using (var response = reqFtp.GetResponse())
                {
                    using (var reader = new StreamReader(response.GetResponseStream()))
                    {
                        var line = reader.ReadLine();
                        while (line != null)
                        {
                            result.Append(line);
                            result.Append("\n");
                            line = reader.ReadLine();
                        }
                        result.Remove(result.ToString().LastIndexOf('\n'), 1);
                    }
                }
                return result.ToString().Split('\n');
            }
            catch (Exception ex)
            {
                Console.WriteLine("FTP ERROR: ", ex.Message);
                return null;
            }

            finally
            {
                ftpRequest = null;
            }
        }

Answer 2

试试这个：

public bool directoryExists(string directory)
{
    /* Create an FTP Request */
    ftpRequest = (FtpWebRequest)FtpWebRequest.Create(host + "/" + directory);
    /* Log in to the FTP Server with the User Name and Password Provided */
    ftpRequest.Credentials = new NetworkCredential(user, pass);
    /* Specify the Type of FTP Request */
    ftpRequest.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
    try
    {
        using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
        {
            return true;
        }
    }
    catch (Exception ex)
    {
        return false;
    }

            /* Resource Cleanup */
    finally
    {
        ftpRequest = null;
    }
}

请注意 using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())

这一行

Answer 3

In 2021 这适用于我们的 Linux 和 Windows live 机器从 ftp 服务器读取（在 Windows 和 Linux 上）

注意

Windows ftp 上的主文件夹是 web
Linux ftp 上的主文件夹是 public_html

TL;DR;

底线：URL 需要以 /

它有效：

ftp://ftp.yourdomain.com.br/public_html/
ftp://ftp.yourdomain.com.br//public_html/
ftp://ftp.yourdomain.com.br/web/
ftp://ftp.yourdomain.com.br//web/

它不起作用：

ftp://ftp.yourdomain.com.br/public_html
ftp://ftp.yourdomain.com.br//public_html
ftp://ftp.yourdomain.com.br/web
ftp://ftp.yourdomain.com.br//web

用法： //验证目录public_html是否存在

var url = "/public_html/";
var result = FtpUtil.DoesDirectoryExists(url,  "ftp://ftp.yourdomain.com.br", "ftp user here", "ftp password here");

static bool DoesDirectoryExists(string directory, string ftpHost, string ftpUser, string ftpPassword) {
                    FtpWebRequest ftpRequest = null;
                    try {
                            ftpRequest = (FtpWebRequest)WebRequest.Create(new Uri("ftp://" + ftpHost + directory));
                            ftpRequest.Credentials = new NetworkCredential(ftpUser, string ftpPassword);
                            ftpRequest.UseBinary = true;// optional
                            ftpRequest.KeepAlive = false;// optional
                            ftpRequest.UsePassive = true;// optional
                            ftpRequest.Method = WebRequestMethods.Ftp.ListDirectory;
        
                            using (FtpWebResponse response = (FtpWebResponse)ftpRequest.GetResponse()) {
                                return true;//directory found
                            }
                    }
                    catch (WebException ex) {
                            if (ex.Response != null) {
                                FtpWebResponse response = (FtpWebResponse)ex.Response;
                                if (response.StatusCode == FtpStatusCode.ActionNotTakenFileUnavailable)
                                    return false;// directory not found.  
                            }
                            return false; // directory not found.
                    }
                    finally {
                        ftpRequest = null;
                    }
        }

C＃检查FTP目录是否存在

3 个答案: