Downloading multiple files from FTP server

I've multiple files on a ftp server.I do not know the names of these files except that they are all. xml files. How do I programmatically download these files using .Net's FtpWebRequest?

Thanks.

Most likely you'll have to issue a Dir command that lists out all the files, then go through each one downloading it.

Here is some info on getting a directory listing.

http://msdn.microsoft.com/en-us/library/ms229716.aspx

Take a look at the ListDirectory function. It's the equivalent of the NLIST command in FTP.

You'll probably want to use an existing library like this one rather than write your own.

FtpWebRequest __request = (FtpWebRequest)FtpWebRequest.Create(__requestLocation);
__request.Method = WebRequestMethods.Ftp.ListDirectory;

var __response = (FtpWebResponse)__request.GetResponse();
                        using (StreamReader __directoryList = new StreamReader(__response.GetResponseStream())) {
                            string ___line = __directoryList.ReadLine();
                            while (___line != null) {
                                if (!String.IsNullOrEmpty(___line)) { __output.Add(___line); }
                                ___line = __directoryList.ReadLine();
                            }

                            break;
                        }

Getting the target file...

FtpWebRequest __request = null;
FtpWebResponse __response = null;
byte[] __fileBuffer = null;
byte[] __outputBuffer = null;

__request = (FtpWebRequest)FtpWebRequest.Create(__requestLocation);
__request.Method = WebRequestMethods.Ftp.DownloadFile;

__response = (FtpWebResponse)__request.GetResponse();

using (MemoryStream __outputStream = new MemoryStream()) {
   using (Stream __responseStream = __response.GetResponseStream()) {
      using (BufferedStream ___outputBuffer = new BufferedStream(__responseStream)) {
         __fileBuffer = new byte[BLOCKSIZE];
         int ___readCount = __responseStream.Read(__fileBuffer, 0, BLOCKSIZE);

         while (___readCount > 0) {
            __outputStream.Write(__fileBuffer, 0, ___readCount);
            ___readCount = __responseStream.Read(__fileBuffer, 0, BLOCKSIZE);
         }

         __outputStream.Position = 0;
         __outputBuffer = new byte[__outputStream.Length];
         //Truncate Buffer to only the specified bytes. Store into output buffer
         Array.Copy(__outputStream.GetBuffer(), __outputBuffer, __outputStream.Length);

         break;
      }
   }
}

try { __response.Close(); } catch { }
__request = null;
__response = null;

return __outputBuffer;

Ripped out of some other code I have, so it probably wont compile and run directly.

I don't know if the FtpWebRequest is a strict requirement. If you can use a third party component following code would accomplish your task:

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

// download all files in the current directory which matches the "*.xml" mask 
// at the server to the 'c:\data' directory 
client.GetFiles("*.xml", @"c:\data", FtpBatchTransferOptions.Default);

client.Disconnect();

The code uses Rebex FTP which can be downloaded here.

Disclaimer: I'm involved in the development of this product.

来源：https://stackoverflow.com/questions/1890886/downloading-multiple-files-from-ftp-server

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ftpwebrequest