private void TryCleanupExistingDownloadWebClient()
{
if (downloadWebClient == null)
{
return;
}
try
{
lock (this)
{
if (downloadWebClient != null)
{
downloadWebClient.DownloadFileCompleted -= OnDownloadCompleted;
downloadWebClient.DownloadProgressChanged -= OnDownloadProgressChanged;
downloadWebClient.OpenReadCompleted -= OnOpenReadCompleted;
downloadWebClient.CancelAsync();
downloadWebClient.Dispose();
downloadWebClient = null;
}
}
}
catch (System.Exception)
{
//logger.Warn("Error while cleaning up web client : {0}", e.Message);
}
}
private void TriggerWebClientDownloadFileAsync()
{
//logger.Debug("Falling back to legacy DownloadFileAsync.");
try
{
isFallback = true;
var destinationDirectory = Path.GetDirectoryName(localFileName);
if (destinationDirectory != null && !Directory.Exists(destinationDirectory))
{
Directory.CreateDirectory(destinationDirectory);
}
TryCleanupExistingDownloadWebClient();
downloadWebClient = CreateWebClient();
downloadWebClient.DownloadFileAsync(fileSource, localFileName);
//logger.Debug("Download async started. Source: {0} Destination: {1}", fileSource, localFileName);
}
catch (System.Exception ex)
{
//logger.Warn("Failed to download Source:{0}, Destination:{1}, Error:{2}.", fileSource, localFileName, ex.Message);
if (!AttemptDownload())
{
InvokeDownloadCompleted(CompletedState.Failed, localFileName, ex);
}
}
}
private DownloadWebClient CreateWebClient()
{
var webClient = new DownloadWebClient();
webClient.DownloadFileCompleted += OnDownloadCompleted;
webClient.DownloadProgressChanged += OnDownloadProgressChanged;
webClient.OpenReadCompleted += OnOpenReadCompleted;
return(webClient);
}
private void Download(Uri source, string fileDestination, long totalBytesToReceive)
{
try
{
long seekPosition;
FileUtils.TryGetFileSize(fileDestination, out seekPosition);
TryCleanupExistingDownloadWebClient();
downloadWebClient = CreateWebClient();
downloadWebClient.OpenReadAsync(source, seekPosition);
//logger.Debug("Download started. Source: {0} Destination: {1} Size: {2}", source, fileDestination, totalBytesToReceive);
}
catch (System.Exception e)
{
//logger.Debug("Download failed: {0}", e.Message);
if (!AttemptDownload())
{
InvokeDownloadCompleted(CompletedState.Failed, localFileName, e);
}
}
}
