[Mono-bugs] [Bug 477611] New: WebClient.DownloadData throws exception on FTP GET download

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Thu Feb 19 05:52:16 EST 2009


           Summary: WebClient.DownloadData throws exception on FTP GET
    Classification: Mono
           Product: Mono: Class Libraries
           Version: SVN
          Platform: 32bit
        OS/Version: Ubuntu
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: System
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: martijndijksterhuis at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:
Gecko/2009020911 Ubuntu/8.10 (intrepid) Firefox/3.0.6

When downloading an FTP file through WebClient the attached program throws a
method not supported exception on Mono (CVS). The program runs fine on Visual
C# Studio. 

The problem is caused by line 274 in Webclient.CS it assigns "GET" as the way
to retrieve the file through FTP. (Which should be sane way to download an FTP

274: request = SetupRequest (address, "GET");

A few lines further the code in FTPWebRequest.cs (line 226) checks for "GET" in
"supportedCommands", cannot find it and throws the exception. 

226: if (value.Length == 0 || Array.BinarySearch (supportedCommands, value) <
227:  throw new ArgumentException ("Method not supported", "value");

Reproducible: Always

Steps to Reproduce:
1.Use the attached code to download a file through FTP 
2.Watch it crash

Actual Results:  

Expected Results:  
Programs returns the FTP file in a byte[]

// Main.cs created with MonoDevelop
// User: martijn at 4:39 PM 2/18/2009
// To change standard headers go to Edit->Preferences->Coding->Standard Headers
using System;
using System.Net;

namespace BasicFTPClientNamespace
    class BasicFTPClient
        public string Username;
        public string Password;
        public string Host;
        public int    Port;

        public BasicFTPClient()
            Username = "anonymous";
            Password = "anonymous at internet.com";
            Port     = 21;
            Host     = "";

         public BasicFTPClient(string theUser,string thePassword,string
            Username = theUser;
            Password = thePassword;
            Host = theHost;
            Port = 21;

        private Uri BuildServerUri(string Path)
            return new Uri(String.Format("ftp://{0}:{1}/{2}",Host,Port,Path));

        public byte[] DownloadData(string path)
            byte [] FileData = null;

            // Get the object used to communicate with the server.
            WebClient request = new WebClient();

            // Logon to the server using username + password
            request.Credentials = new NetworkCredential (Username,Password);

                Uri URL = BuildServerUri(path);
                FileData = request.DownloadData (BuildServerUri(path));
            catch (WebException e)

            return FileData;


    class MainClass

        public static void Main(string[] args)
           BasicFTPClient MyClient = new BasicFTPClient();


           byte[] Data = MyClient.DownloadData("mytest.txt");


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