Download FTP : System.OutOfMemoryException

**bensra** · 30/06/2011, 10h23

Bonjour,

Lors du téléchargement d'un fichier de 400 Mo, mon programme lève une exception de type "System.OutOfMemoryException" En dessous de cette taille cela ne pose pas de problème.

Voici mon code :

Code :

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 public void telechargerFichier(string fichier)
        {
            byte[] downloadedData;
            downloadedData = new byte[0];
            Stream reader = null;
            MemoryStream memStream = new MemoryStream();
            FtpWebResponse response = null;
 
            try
            {
 
                FtpWebRequest request = FtpWebRequest.Create(url + "/" + fichier) as FtpWebRequest;
 
                request.Credentials = new NetworkCredential("ftp", "");
                request.UsePassive = true;
                request.UseBinary = true;
                request.KeepAlive = true;
 
                request.Method = WebRequestMethods.Ftp.DownloadFile;
                //Streams
                response = request.GetResponse() as FtpWebResponse;
                reader = response.GetResponseStream();
 
                request = FtpWebRequest.Create(url + "/" + fichier) as FtpWebRequest;
                request.Method = WebRequestMethods.Ftp.GetFileSize;
                request.Credentials = new NetworkCredential("ftp", "");
                request.UsePassive = true;
                request.UseBinary = true;
                request.KeepAlive = true; //don't close the connection
 
                int dataLength = (int)request.GetResponse().ContentLength;
 
                //Download to memory              
                memStream = new MemoryStream();
                byte[] buffer = new byte[1024]; //downloads in chuncks
 
                while (true)
                {
                    Application.DoEvents();
 
                    int bytesRead = reader.Read(buffer, 0, buffer.Length);
 
                    if (bytesRead == 0)
                    {
                        break;
                    }
                    else
                    {
                        //Write the downloaded data
                        memStream.Write(buffer, 0, bytesRead);
 
                    }
                }
 
                //Convert the downloaded stream to a byte array
                downloadedData = memStream.ToArray();
 
                Application.DoEvents();
                //Enregistrement du fichier sur le disque
                if (downloadedData != null && downloadedData.Length != 0)
                {
                    //Write the bytes to a file
                    FileStream newFile = new FileStream(@"C:\FTP\" + fichier, FileMode.Create);
                    newFile.Write(downloadedData, 0, downloadedData.Length);
 
                }
                //Clean up
                reader.Close();
                memStream.Close();
                response.Close();
 
            }
            catch (Exception e)
            {
 
            }
 
        }