Paraleller Dateidownload


Ichbinalex

Erfahrenes Mitglied
Hallo,
Ich baue gerade in C# einen Downloadmanager. Nun habe ich das Problem das wenn ich zwei Threads die downloaden Parallel starten will die Exception:
{"Der Stream unterstützt keine gleichzeitigen E/A-Lese- oder Schreibvorgänge."} auslöst

Code der Downloadmethode:
Code:
public static void DownloadF(object startPoint, string Url, string Path, DataGridViewProgressCell prgDownload, DataGridView view)
        {
            try
            {
                // Put the object argument into an int variable
                int startPointInt = Convert.ToInt32(startPoint);
                // Create a request to the file we are downloading
                webRequest = (HttpWebRequest)WebRequest.Create(Url);
                // Set the starting point of the request
                webRequest.AddRange(startPointInt);

                // Set default authentication for retrieving the file
                webRequest.Credentials = CredentialCache.DefaultCredentials;
                // Retrieve the response from the server
                    webResponse = (HttpWebResponse)webRequest.GetResponse();
                // Ask the server for the file size and store it
                Int64 fileSize = webResponse.ContentLength;

                // Open the URL for download 
                strResponse = webResponse.GetResponseStream();

                // Create a new file stream where we will be saving the data (local drive)
                if (startPointInt == 0)
                {
                    strLocal = new FileStream(Path, FileMode.Create, FileAccess.Write, FileShare.None);
                }
                else
                {
                    strLocal = new FileStream(Path, FileMode.Append, FileAccess.Write, FileShare.None);
                }

                // It will store the current number of bytes we retrieved from the server
                int bytesSize = 0;
                // A buffer for storing and writing the data retrieved from the server
                byte[] downBuffer = new byte[2048];

                // Loop through the buffer until the buffer is empty
                while ((bytesSize = strResponse.Read(downBuffer, 0, downBuffer.Length)) > 0) //HIER LÖST DER FEHLER AUS
                {
                    // Write the data from the buffer to the local hard drive
                    strLocal.Write(downBuffer, 0, bytesSize);
                    // Invoke the method that updates the form's label and progress bar
                    view.Invoke(new UpdateProgessCallback(UpdateProgress), new object[] { strLocal.Length, fileSize + startPointInt,prgDownload });

                    if (goPause == true)
                    {
                        break;
                    }
                }
            }
            finally
            {
                // When the above code has ended, close the streams
                strResponse.Close();
                strLocal.Close();
                view.Invoke(new UpdateStatusCallback(UpdateStatus), new object[] {Status.DOWNLOADED,prgDownload,view });
            }
Ich starte die Methode, dann in verschiedenen Threads, und dann wieder wird die Exception geschmissen. Weiß zufällig jemand wie ich das umgehen kann?