C# 如何检查FTP目录是否存在

C# 如何检查FTP目录是否存在,c#,.net,ftp,ftpwebrequest,C#,.net,Ftp,Ftpwebrequest,寻找通过FTP检查给定目录的最佳方法 目前我有以下代码: private bool FtpDirectoryExists(string directory, string username, string password) { try { var request = (FtpWebRequest)WebRequest.Create(directory); request.Credentials = new NetworkCredential(u

寻找通过FTP检查给定目录的最佳方法

目前我有以下代码:

private bool FtpDirectoryExists(string directory, string username, string password)
{

    try
    {
        var request = (FtpWebRequest)WebRequest.Create(directory);
        request.Credentials = new NetworkCredential(username, password);
        request.Method = WebRequestMethods.Ftp.GetDateTimestamp;

        FtpWebResponse response = (FtpWebResponse)request.GetResponse();
    }
    catch (WebException ex)
    {
        FtpWebResponse response = (FtpWebResponse)ex.Response;
        if (response.StatusCode == FtpStatusCode.ActionNotTakenFileUnavailable)
            return false;
        else
            return true;
    }
    return true;
}

无论目录是否存在,都返回false。有人能给我指出正确的方向吗。

导航到父目录,执行“ls”命令,并解析结果。

如果您使用该组件,您的FTP生活将变得更加轻松。它是免费的,因为它处理命令和响应,所以可以省去你们的麻烦。您只需使用一个漂亮、简单的对象。

基本上捕获了我在创建这样的目录时收到的错误

private bool CreateFTPDirectory(string directory) {

    try
    {
        //create the directory
        FtpWebRequest requestDir = (FtpWebRequest)FtpWebRequest.Create(new Uri(directory));
        requestDir.Method = WebRequestMethods.Ftp.MakeDirectory;
        requestDir.Credentials = new NetworkCredential("username", "password");
        requestDir.UsePassive = true;
        requestDir.UseBinary = true;
        requestDir.KeepAlive = false;
        FtpWebResponse response = (FtpWebResponse)requestDir.GetResponse();
        Stream ftpStream = response.GetResponseStream();

        ftpStream.Close();
        response.Close();

        return true;
    }
    catch (WebException ex)
    {
        FtpWebResponse response = (FtpWebResponse)ex.Response;
        if (response.StatusCode == FtpStatusCode.ActionNotTakenFileUnavailable)
        {
            response.Close();
            return true;
        }
        else
        {
            response.Close();
            return false;
        }  
    }
}

我无法让@BillyLogans的建议生效

我发现问题是默认的FTP目录是/home/usr/fred

当我使用:

String directory = "ftp://some.domain.com/mydirectory"
FtpWebRequest requestDir = (FtpWebRequest)FtpWebRequest.Create(new Uri(directory));
我发现这个变成了

"ftp:/some.domain.com/home/usr/fred/mydirectory"
要停止此操作,请将目录Uri更改为:

String directory = "ftp://some.domain.com//mydirectory"

然后这就开始起作用了。

我会尝试以下方法:

  • 发送MLST FTP命令(在RFC3659中定义)并解析其输出。它应该返回包含现有目录的目录详细信息的有效行

  • 如果MLST命令不可用,请尝试使用CWD命令将工作目录更改为测试目录。在更改到测试目录以便能够返回之前,不要忘记确定当前路径(PWD命令)

  • 在某些服务器上,MDTM和SIZE命令的组合可以用于类似的目的,但其行为非常复杂,超出了本文的范围

这基本上就是当前版本的DirectoryExists方法所做的。以下代码显示了如何使用它:

string path = "/path/to/directory";

Rebex.Net.Ftp ftp = new Rebex.Net.Ftp();
ftp.Connect("hostname");
ftp.Login("username","password");

Console.WriteLine(
  "Directory '{0}' exists: {1}", 
  path, 
  ftp.DirectoryExists(path)
);

ftp.Disconnect();

使用此代码,它可能是您的答案

 public bool FtpDirectoryExists(string directoryPath, string ftpUser, string ftpPassword)
        {
            bool IsExists = true;
            try
            {
                FtpWebRequest request = (FtpWebRequest)WebRequest.Create(directoryPath);
                request.Credentials = new NetworkCredential(ftpUser, ftpPassword);
                request.Method = WebRequestMethods.Ftp.PrintWorkingDirectory;

                FtpWebResponse response = (FtpWebResponse)request.GetResponse();
            }
            catch (WebException ex)
            {
                IsExists = false;
            }
            return IsExists;
        }
我将此方法称为:

bool result =    FtpActions.Default.FtpDirectoryExists( @"ftp://mydomain.com/abcdir", txtUsername.Text, txtPassword.Text);


为什么要使用另一个库-创建您自己的逻辑。

我尝试了各种方法以获得可靠的检查,但
WebRequestMethods.Ftp.PrintWorkingDirectory
WebRequestMethods.Ftp.ListDirectory
方法都不能正常工作。检查
ftp:///Logs
服务器上不存在,但他们说有

所以我想出的方法是尝试上传到文件夹。但是,有一个“gotcha”是您可以在这个线程中阅读的路径格式

下面是一段代码片段

private bool DirectoryExists(string d) 
{ 
    bool exists = true; 
    try 
    { 
        string file = "directoryexists.test"; 
        string path = url + homepath + d + "/" + file;
        //eg ftp://website//home/directory1/directoryexists.test
        //Note the double space before the home is not a mistake

        //Try to save to the directory 
        req = (FtpWebRequest)WebRequest.Create(path); 
        req.ConnectionGroupName = "conngroup1"; 
        req.Method = WebRequestMethods.Ftp.UploadFile; 
        if (nc != null) req.Credentials = nc; 
        if (cbSSL.Checked) req.EnableSsl = true; 
        req.Timeout = 10000; 

        byte[] fileContents = System.Text.Encoding.Unicode.GetBytes("SAFE TO DELETE"); 
        req.ContentLength = fileContents.Length; 

        Stream s = req.GetRequestStream(); 
        s.Write(fileContents, 0, fileContents.Length); 
        s.Close(); 

        //Delete file if successful 
        req = (FtpWebRequest)WebRequest.Create(path); 
        req.ConnectionGroupName = "conngroup1"; 
        req.Method = WebRequestMethods.Ftp.DeleteFile; 
        if (nc != null) req.Credentials = nc; 
        if (cbSSL.Checked) req.EnableSsl = true; 
        req.Timeout = 10000; 

        res = (FtpWebResponse)req.GetResponse(); 
        res.Close(); 
    } 
    catch (WebException ex) 
    { 
        exists = false; 
    } 
    return exists; 
} 

我假设您已经对FtpWebRequest有些熟悉,因为这是在.NET中访问FTP的常用方法

您可以尝试列出目录并检查错误状态代码

try 
{  
    FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://ftp.microsoft.com/12345");  
    request.Method = WebRequestMethods.Ftp.ListDirectory;  
    using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())  
    {  
        // Okay.  
    }  
}  
catch (WebException ex)  
{  
    if (ex.Response != null)  
    {  
        FtpWebResponse response = (FtpWebResponse)ex.Response;  
        if (response.StatusCode == FtpStatusCode.ActionNotTakenFileUnavailable)  
        {  
            // Directory not found.  
        }  
    }  
} 

我也遇到了类似的问题。我用的是

FtpWebRequest=(FtpWebRequest)WebRequest.Create(“ftp://ftpserver.com/rootdir/test_if_exist_directory");  
request.Method=WebRequestMethods.Ftp.ListDirectory;
FtpWebResponse response=(FtpWebResponse)request.GetResponse();
并等待一个异常,以防目录不存在。此方法未引发异常

经过几次尝试,我将目录更改为: "ftp://ftpserver.com/rootdir/test_if_exist_directory“至:”ftp://ftpserver.com/rootdir/test_if_exist_directory/". 现在代码对我有用了

我认为我们应该将forwardslash(/)附加到ftp文件夹的URI中,以使其正常工作

根据要求,完整的解决方案现在将是:

public bool doesfpdirectoryExist(字符串dirPath)
{
尝试
{
FtpWebRequest=(FtpWebRequest)WebRequest.Create(dirPath);
request.Method=WebRequestMethods.Ftp.ListDirectory;
FtpWebResponse response=(FtpWebResponse)request.GetResponse();
返回true;
}
捕获(WebException ex)
{
返回false;
}
}
//调用该方法(请注意路径末尾的正斜杠):
字符串ftpDirectory=”ftp://ftpserver.com/rootdir/test_if_exist_directory/";
bool dirExists=DoesFtpDirectoryExist(ftpDirectory);

对我来说唯一有效的方法是反向逻辑,尝试创建目录/路径(如果已经存在,将抛出异常),如果已经存在,则再次删除。否则,使用异常设置一个标志,表示目录/路径存在。我是VB.NET新手,我是舒尔,有一种更好的方法来编写此代码-但无论如何,我的代码如下:

        Public Function DirectoryExists(directory As String) As Boolean
        ' Reversed Logic to check if a Directory exists on FTP-Server by creating the Directory/Path
        ' which will throw an exception if the Directory already exists. Otherwise create and delete the Directory

        ' Adjust Paths
        Dim path As String
        If directory.Contains("/") Then
            path = AdjustDir(directory)     'ensure that path starts with a slash
        Else
            path = directory
        End If

        ' Set URI (formatted as ftp://host.xxx/path)

        Dim URI As String = Me.Hostname & path

        Dim response As FtpWebResponse

        Dim DirExists As Boolean = False
        Try
            Dim request As FtpWebRequest = DirectCast(WebRequest.Create(URI), FtpWebRequest)
            request.Credentials = Me.GetCredentials
            'Create Directory - if it exists WebException will be thrown
            request.Method = WebRequestMethods.Ftp.MakeDirectory

            'Delete Directory again - if above request did not throw an exception
            response = DirectCast(request.GetResponse(), FtpWebResponse)
            request = DirectCast(WebRequest.Create(URI), FtpWebRequest)
            request.Credentials = Me.GetCredentials
            request.Method = WebRequestMethods.Ftp.RemoveDirectory
            response = DirectCast(request.GetResponse(), FtpWebResponse)
            DirExists = False

        Catch ex As WebException
            DirExists = True
        End Try
        Return DirExists

    End Function
WebRequestMethods.Ftp.MakeDirectory和WebRequestMethods.Ftp.RemoveDirectory是我用于此的方法。所有其他的解决方案都不适合我


希望能有所帮助这是我最好的选择。从父目录获取列表,并检查父目录是否具有正确的子名称

public void TryConnectFtp(string ftpPath)
        {
            string[] splited = ftpPath.Split('/');
            StringBuilder stb = new StringBuilder();
            for (int i = 0; i < splited.Length - 1; i++)
            {
                stb.Append(splited[i] +'/');
            }
            string parent = stb.ToString();
            string child = splited.Last();

            FtpWebRequest testConnect = (FtpWebRequest)WebRequest.Create(parent);
            testConnect.Method = WebRequestMethods.Ftp.ListDirectory;
            testConnect.Credentials = credentials;
            using (FtpWebResponse resFtp = (FtpWebResponse)testConnect.GetResponse())
            {
                StreamReader reader = new StreamReader(resFtp.GetResponseStream());
                string result = reader.ReadToEnd();
                if (!result.Contains(child) ) throw new Exception("@@@");

                resFtp.Close();
            }
        }
public void TryConnectFtp(字符串ftpPath)
{
string[]splited=ftpPath.Split('/');
StringBuilder stb=新的StringBuilder();
对于(int i=0;i
这将只返回CWD(当前工作目录)。无论您将什么附加到主机地址(例如:)中,它都将始终返回当前目录。换句话说,IsExists将永远不会是除true之外的任何内容。如果这是我做的唯一一件事(如上所述),那么在我的服务器上,它只会显示“257'/'是当前目录”。不是“257'/abcdir/”是当前目录。这是每个人都会想到的。这段代码是不可靠的:例如,如果你还没有写