C# Absolute URI removes ".." from URL

I have to upload a file via FTP to ftp://ftp.remoteServer.com

My root directory on remoteServer contains an "upload" and a "download" folder. I need to put my file in the "upload" directory. But on log in, the server automatically puts me in the "download" folder.

I tried doing this:

string serverTarget = "ftp://ftp.remoteServer.com/";
serverTarget += "../upload/myfile.txt";
Uri target = new Uri(serverTarget);
FTPWebRequest ftp = (FTPWebRequest)FtpWebRequest.Create(target);

using(Stream requestStream = ftp.GetRequestStream()) {
    // Do upload here
}

This code fails with: (550) File unavailable (eg, file not found, no access) I debugged the code, and target.AbsoluteUri returns as ftp://ftp.remoteServer.com/upload instead of ftp://ftp.remoteServer.com/../upload (missing the ..)

If I put ftp://ftp.remoteServer.com/../upload in a browser, I can log in and verify this is the correct place where I want to put my file.

How can I get the FTPWebRequest to go to the correct place?

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I believe you can encode the dots as %2E to keep the dots in your URI.

So something like:

string serverTarget = "ftp://ftp.remoteServer.com/%2E%2E/upload/myfile.txt";

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尝试这个：

string serverTarget = "../upload/myfile.txt";
Uri uri = new Uri(serverTarget, UriKind.Relative);

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Andy Evans' comment is correct.

Consider the URI: http://ftp.myserver.com/../ . The .. means, "take me to the parent of this directory". But there is no parent! So when you derive the absolute URL, you're going to end up with http://ftp.myserver.com/ There is nothing else that the parser can do.

I think the problem is with the configuration of your FTP server. I assume that the directory structure looks something like:

ftproot
    upload
    download

It looks like the FTP service is automatically logging you to /ftproot/download . That is, the URI ftp.myserver.com gets mapped to /ftproot/download on the local file system. If that's the case, no amount of fiddling with the URI is going to get you anywhere. If the URI root is mapped to the download directory, there is no way you can, using the .. syntax, "go up one level and then down."

Are you able to upload using an FTP client such as Filezilla, or perhaps the Windows FTP command line tool? If so, what are the steps you take to do it? Can you make your code do the same thing?

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