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