FTPClient如何删除目录？

Question

我想删除 FTP 中的一个文件夹。

FTPClient对象可以删除它吗？

Answer 1

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();
}

使用它如下：

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

---

虽然它变得更复杂，但如果您需要删除非空目录。 FtpWebRequest 类（或 .NET 框架中的任何其他 FTP 实现）不支持递归操作。您必须自己实现递归：

• 列出远程目录
• 迭代条目，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。无法使用 FtpWebRequest 以可移植的方式做到这一点。不幸的是，FtpWebRequest 不支持 MLSD 命令，这是在 FTP 协议中检索具有文件属性的目录列表的唯一可移植方法。另请参阅检查 FTP 服务器上的对象是文件还是目录。

您的选择是：

• 对文件名执行操作，该操作对于文件肯定会失败，而对于目录则成功（反之亦然）。即你可以尝试下载“名称”。如果成功，它是一个文件，如果失败，它是一个目录。但是，当您有大量条目时，这可能会成为性能问题。
• 您可能很幸运，在您的特定情况下，您可以通过文件名区分文件和目录（即所有文件都有扩展名，而子目录没有）
• 您使用长目录列表（LIST command = ListDirectoryDe​​tails 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，您可以通过条目开头的 d 来标识目录。但许多服务器使用不同的格式。以下示例使用此方法（假设为 *nix 格式）。
• 在这种特定情况下，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。如果列出成功，您将假定它是一个文件夹并进行相应的操作。不幸的是，当您尝试列出文件时，某些服务器不会出错。他们只会返回一个包含该文件的单个条目的列表。

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

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

    using (var listResponse = (FtpWebResponse)listRequest.GetResponse())
    using (Stream listStream = listResponse.GetResponseStream())
    using (var 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
        {
            var deleteRequest = (FtpWebRequest)WebRequest.Create(fileUrl);
            deleteRequest.Method = WebRequestMethods.Ftp.DeleteFile;
            deleteRequest.Credentials = credentials;

            deleteRequest.GetResponse();
        }
    }

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

    removeRequest.GetResponse();
}

使用它的方式与之前的（扁平）实现相同。

尽管 Microsoft 不建议使用 FtpWebRequest一个新的发展。

---

或者使用支持递归操作的第三方库。

例如，使用 WinSCP .NET 程序集，您可以通过一次调用 Session.RemoveFiles：

// 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();
} 

在内部，WinSCP 使用 MLSD 命令（如果服务器支持）。如果没有，它会使用 LIST 命令并支持数十种不同的列表格式。

（我是 WinSCP 的作者）

Answer 2

我发现工作的唯一方法是依赖“WebRequestMethods.Ftp.DeleteFile”，它会在文件夹或带有文件的文件夹的情况下给出例外，因此我创建了一个新的内部方法来递归删除目录
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;
            }

List Direcotry Children

/* 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[] { "" };
            }

Answer 3

FtpWebRequest 提供删除操作。
这是实现该目的的一段代码：

               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();

它应该适用于文件和目录。事实上，请检查您是否拥有正确的权限。

此外，当文件夹不为空时，您无法删除它们。您必须递归遍历它们才能删除之前的内容。

由于权限问题引发的异常并不总是很清楚......

Answer 4

重要点

如上所述..

当文件夹不为空时您无法删除它们。您必须递归遍历它们才能删除之前的内容。

Answer 5

public void Deletedir(string remoteFolder)
{
    try
    {
        /* Create an FTP Request */
        ftpRequest = (FtpWebRequest)FtpWebRequest.Create(host + "/"+ remoteFolder);
        /* 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;***strong text***
        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();
        /* Get the FTP Server's Response Stream */
        ftpStream = ftpResponse.GetResponseStream();
        /* Open a File Stream to Write the Downloaded File */
    }
    catch { }
}

这就是您可以使用的代码。
以下是您如何使用它，例如，单击按钮。

private void button5_Click(object sender, EventArgs e)
{
    ftp ftpClient = new ftp(@"SERVICE PROVIDER", "USERNAME", "PASSWORD");
    ftpClient.Deletedir("DIRECTORY U WANT TO DELETE");
}

请记住，您的文件夹应该是空的。