How to send arbitrary ftp commands in C#

Question

I have implemented the ability to upload, download, delete, etc. using the FtpWebRequest class in C#. That is fairly straight forward.

What I need to do now is support sending arbitrary ftp commands such as

quote SITE LRECL=132 RECFM=FB
or 
quote SYST

Here's an example configuration straight from our app.config:

<!-- The following commands will be executed before any uploads occur -->
<extraCommands>
     <command>quote SITE LRECL=132 RECFM=FB</command>
</extraCommands>

I'm still researching how to do this using FtpWebRequest. I'll probably try WebClient class next. Anyone can point me in the right direction quicker? Thanks!

UPDATE: I've come to that same conclusion, as of .NET Framework 3.5 FtpWebRequest doesn't support anything except what's in WebRequestMethods.Ftp.*. I'll try a third party app recommended by some of the other posts. Thanks for the help!

Answer 1

I don't think it can be done with FtpWebRequest... The only way to specify a FTP command is through the Method property, and the documentation states :

Note that the strings defined in the WebRequestMethods.Ftp class are the only supported options for the Method property. Setting the Method property to any other value will result in an ArgumentException exception.

SITE and SYST are not among the predefined options, so I guess you're stuck...

Don't waste time to try the WebClient class, it will give you even less flexibility than FtpWebRequest.

However, there are plenty of third-party FTP implementation, open source or commercial, and I'm pretty sure some of them can handle custom commands...

Answer 2

You can try our Rebex FTP component:

// create client and connect 
Ftp client = new Ftp();
client.Connect("ftp.example.org");
client.Login("username", "password");

// send SITE command
// note that QUOTE and SITE are ommited. QUOTE is command line ftp syntax only.
client.Site("LRECL=132 RECFM=FB");

// send SYST command
client.SendCommand("SYST");
FtpResponse response = client.ReadResponse();
if (response.Group != 2) 
  ; // handle error 

// disconnect 
client.Disconnect();

Answer 3

sendCommand("SITE LRECL=242 BLKSIZE=0 RECFM=FB");