FTPClient如何删除目录？

Question

我想删除FTP中的文件夹。

FTPClient object可以删除它吗？

Answer 1

FtpWebRequest提供了删除操作。下面是实现这一点的一段代码：

               FtpWebRequest reqFTP = FtpWebRequest.Create(uri);
                // Credentials and login handling...

                reqFTP.Method = WebRequestMethods.Ftp.DeleteFile;

                string result = string.Empty;
                FtpWebResponse response = reqFTP.GetResponse();
                long size = response.ContentLength;
                Stream datastream = response.GetResponseStream();
                StreamReader sr = new StreamReader(datastream);
                result = sr.ReadToEnd();
                sr.Close();
                datastream.Close();
                response.Close();

它应该可以在文件和目录上工作。确实，请检查您是否拥有正确的权限。

此外，您不能在文件夹不为空时将其删除。您必须递归地遍历它们以删除之前的内容。

由于权限问题而抛出的异常并不总是非常清楚...

Answer 2

要删除空目录，请使用FtpWebRequest的RemoveDirectory“方法”

void DeleteFtpDirectory(string url, NetworkCredential credentials)
{
    FtpWebRequest request = (FtpWebRequest)WebRequest.Create(url);
    request.Method = WebRequestMethods.Ftp.RemoveDirectory;
    request.Credentials = credentials;
    request.GetResponse().Close();
}

像这样使用它：

string url = "ftp://ftp.example.com/directory/todelete";
NetworkCredential credentials = new NetworkCredential("username", "password");
DeleteFtpDirectory(url, credentials);

不过，如果你需要删除一个非空的目录，它会变得更加复杂。在FTP类(或.NET框架中的任何其他FtpWebRequest实现)中不支持递归操作。您必须自己实现递归：

列出remote directory

• Iterate
• 条目，删除文件并递归到子目录(再次列出它们等)

棘手的部分是从子目录中识别文件。在FtpWebRequest中，无法以可移植的方式做到这一点。遗憾的是，FTP不支持MLSD命令，该命令是在FtpWebRequest协议中检索带有文件属性的目录列表的唯一可移植方法。另请参见Checking if object on FTP server is file or directory。

您可以选择：

• 对文件名执行的操作对于文件肯定会失败，而对于目录肯定会成功(反之亦然)。也就是说，您可以尝试下载“名称”。如果成功，它就是一个文件，如果失败，它就是一个目录。
• 你可能很幸运，在你的特殊情况下，你可以通过文件名来区分文件和目录(即你所有的文件都有扩展名，而子目录没有)
• 你使用一个长的目录列表(LIST
• = ListDirectoryDetails方法)，并尝试解析特定于服务器的列表。许多FTP服务器使用*nix样式的列表，在这种列表中，您通过条目开头的d来标识目录。但许多服务器使用不同的格式。下面的示例使用这种方法(假设格式为*nix )。
• 在此特定情况下，您可以尝试将条目作为文件删除。如果删除失败，请尝试将该条目列为目录。如果清单成功，您将假定它是一个文件夹，并相应地继续操作。不幸的是，当您尝试列出文件时，某些服务器不会出错。它们将只返回一个列表，其中包含该文件的单个条目。

static void DeleteFtpDirectory(string url, NetworkCredential credentials)
{
    FtpWebRequest listRequest = (FtpWebRequest)WebRequest.Create(url);
    listRequest.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
    listRequest.Credentials = credentials;

    List<string> lines = new List<string>();

    using (FtpWebResponse listResponse = (FtpWebResponse)listRequest.GetResponse())
    using (Stream listStream = listResponse.GetResponseStream())
    using (StreamReader listReader = new StreamReader(listStream))
    {
        while (!listReader.EndOfStream)
        {
            lines.Add(listReader.ReadLine());
        }
    }

    foreach (string line in lines)
    {
        string[] tokens =
            line.Split(new[] { ' ' }, 9, StringSplitOptions.RemoveEmptyEntries);
        string name = tokens[8];
        string permissions = tokens[0];

        string fileUrl = url + name;

        if (permissions[0] == 'd')
        {
            DeleteFtpDirectory(fileUrl + "/", credentials);
        }
        else
        {
            FtpWebRequest deleteRequest = (FtpWebRequest)WebRequest.Create(fileUrl);
            deleteRequest.Method = WebRequestMethods.Ftp.DeleteFile;
            deleteRequest.Credentials = credentials;

            deleteRequest.GetResponse();
        }
    }

    FtpWebRequest removeRequest = (FtpWebRequest)WebRequest.Create(url);
    removeRequest.Method = WebRequestMethods.Ftp.RemoveDirectory;
    removeRequest.Credentials = credentials;

    removeRequest.GetResponse();
}

使用它的方式与前一个(平面)实现相同。

虽然Microsoft does not recommend FtpWebRequest for a new development。

或者使用支持递归操作的第三方库。

例如，使用WinSCP .NET assembly，只需调用一次Session.RemoveFiles即可删除整个目录

// Setup session options
SessionOptions sessionOptions = new SessionOptions
{
    Protocol = Protocol.Ftp,
    HostName = "example.com",
    UserName = "user",
    Password = "mypassword",
};

using (Session session = new Session())
{
    // Connect
    session.Open(sessionOptions);

    // Delete folder
    session.RemoveFiles("/directory/todelete").Check();
} 

如果服务器支持，WinSCP会在内部使用MLSD命令。如果没有，它将使用LIST命令并支持数十种不同的列表格式。

(我是WinSCP的作者)

Answer 3

我发现唯一有效的方法是依靠"WebRequestMethods.Ftp.DeleteFile“，它会在文件夹或包含文件的文件夹中给出一个异常，所以我创建了一个新的内部方法来递归地删除目录，这是代码

public void delete(string deleteFile)
            {
                try
                {
                    /* Create an FTP Request */
                    ftpRequest = (FtpWebRequest)WebRequest.Create(host + "/" + deleteFile);
                    /* Log in to the FTP Server with the User Name and Password Provided */
                    ftpRequest.Credentials = new NetworkCredential(user, pass);
                    /* When in doubt, use these options */
                    ftpRequest.UseBinary = true;
                    ftpRequest.UsePassive = true;
                    ftpRequest.KeepAlive = true;
                    /* Specify the Type of FTP Request */
                    ftpRequest.Method = WebRequestMethods.Ftp.DeleteFile;
                    /* Establish Return Communication with the FTP Server */
                    ftpResponse = (FtpWebResponse)ftpRequest.GetResponse();
                    /* Resource Cleanup */
                    ftpResponse.Close();
                    ftpRequest = null;
                }
                catch (Exception ex) { 
                    //Console.WriteLine(ex.ToString()); 
                    try
                    {
                        deleteDirectory(deleteFile);
                    }
                    catch { }


                }
                return;
            }

和目录删除

/* Delete Directory*/
            private void deleteDirectory(string directoryName)
            {
                try
                {
                    //Check files inside 
                    var direcotryChildren  = directoryListSimple(directoryName);
                    if (direcotryChildren.Any() && (!string.IsNullOrWhiteSpace(direcotryChildren[0])))
                    {
                        foreach (var child in direcotryChildren)
                        {
                            delete(directoryName + "/" +  child);
                        }
                    }


                    /* Create an FTP Request */
                    ftpRequest = (FtpWebRequest)WebRequest.Create(host + "/" + directoryName);
                    /* Log in to the FTP Server with the User Name and Password Provided */
                    ftpRequest.Credentials = new NetworkCredential(user, pass);
                    /* When in doubt, use these options */
                    ftpRequest.UseBinary = true;
                    ftpRequest.UsePassive = true;
                    ftpRequest.KeepAlive = true;
                    /* Specify the Type of FTP Request */
                    ftpRequest.Method = WebRequestMethods.Ftp.RemoveDirectory;

                    /* Establish Return Communication with the FTP Server */
                    ftpResponse = (FtpWebResponse)ftpRequest.GetResponse();
                    /* Resource Cleanup */
                    ftpResponse.Close();
                    ftpRequest = null;
                }
                catch (Exception ex) { Console.WriteLine(ex.ToString()); }
                return;
            }

列出目录尝试子项

/* List Directory Contents File/Folder Name Only */
            public string[] directoryListSimple(string directory)
            {
                try
                {
                    /* 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);
                    /* When in doubt, use these options */
                    ftpRequest.UseBinary = true;
                    ftpRequest.UsePassive = true;
                    ftpRequest.KeepAlive = true;
                    /* Specify the Type of FTP Request */
                    ftpRequest.Method = WebRequestMethods.Ftp.ListDirectory;
                    /* Establish Return Communication with the FTP Server */
                    ftpResponse = (FtpWebResponse)ftpRequest.GetResponse();
                    /* Establish Return Communication with the FTP Server */
                    ftpStream = ftpResponse.GetResponseStream();
                    /* Get the FTP Server's Response Stream */
                    StreamReader ftpReader = new StreamReader(ftpStream);
                    /* Store the Raw Response */
                    string directoryRaw = null;
                    /* Read Each Line of the Response and Append a Pipe to Each Line for Easy Parsing */
                    try { while (ftpReader.Peek() != -1) { directoryRaw += ftpReader.ReadLine() + "|"; } }
                    catch (Exception ex) { Console.WriteLine(ex.ToString()); }
                    /* Resource Cleanup */
                    ftpReader.Close();
                    ftpStream.Close();
                    ftpResponse.Close();
                    ftpRequest = null;
                    /* Return the Directory Listing as a string Array by Parsing 'directoryRaw' with the Delimiter you Append (I use | in This Example) */
                    try { string[] directoryList = directoryRaw.Split("|".ToCharArray()); return directoryList; }
                    catch (Exception ex) { Console.WriteLine(ex.ToString()); }
                }
                catch (Exception ex) { Console.WriteLine(ex.ToString()); }
                /* Return an Empty string Array if an Exception Occurs */
                return new string[] { "" };
            }

            /* List Directory Contents in Detail (Name, Size, Created, etc.) */
            public string[] directoryListDetailed(string directory)
            {
                try
                {
                    /* 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);
                    /* When in doubt, use these options */
                    ftpRequest.UseBinary = true;
                    ftpRequest.UsePassive = true;
                    ftpRequest.KeepAlive = true;
                    /* Specify the Type of FTP Request */
                    ftpRequest.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
                    /* Establish Return Communication with the FTP Server */
                    ftpResponse = (FtpWebResponse)ftpRequest.GetResponse();
                    /* Establish Return Communication with the FTP Server */
                    ftpStream = ftpResponse.GetResponseStream();
                    /* Get the FTP Server's Response Stream */
                    StreamReader ftpReader = new StreamReader(ftpStream);
                    /* Store the Raw Response */
                    string directoryRaw = null;
                    /* Read Each Line of the Response and Append a Pipe to Each Line for Easy Parsing */
                    try { while (ftpReader.Peek() != -1) { directoryRaw += ftpReader.ReadLine() + "|"; } }
                    catch (Exception ex) { Console.WriteLine(ex.ToString()); }
                    /* Resource Cleanup */
                    ftpReader.Close();
                    ftpStream.Close();
                    ftpResponse.Close();
                    ftpRequest = null;
                    /* Return the Directory Listing as a string Array by Parsing 'directoryRaw' with the Delimiter you Append (I use | in This Example) */
                    try { string[] directoryList = directoryRaw.Split("|".ToCharArray()); return directoryList; }
                    catch (Exception ex) { Console.WriteLine(ex.ToString()); }
                }
                catch (Exception ex) { Console.WriteLine(ex.ToString()); }
                /* Return an Empty string Array if an Exception Occurs */
                return new string[] { "" };
            }