public async void ResumeDownload(Model.Download download)
{
download.FileRenameCancelToken = new FileRenameCancelToken();
var fileResume = new FileResumeStreamer(download.TempFileName, download.TargetPathWithFileName, download.FileRenameCancelToken);
await RunDownload(
download,
request => request.AddRange(download.GetBytesFromAllParts()),
fileResume);
}
private async Task RunDownload(Model.Download download, Action <HttpWebRequest> configureRequest, FileRenameStreamer fileRenameStreamer)
{
try
{
_cancellationTokenSource = new CancellationTokenSource();
var request = (HttpWebRequest)WebRequest.Create(new Uri(download.SourcePath));
configureRequest(request);
using (var response = await request.GetResponseAsync())
{
fileRenameStreamer.SetContentLength(response.ContentLength);
var data = response.GetResponseStream();
using (fileRenameStreamer)
{
var byteBuffer = fileRenameStreamer.GetByteBuffer();
fileRenameStreamer.SetStreamPosition(download.GetBytesFromAllParts());
download.TotalFileSize = fileRenameStreamer.GetTotalFileSize();
await MakeDownload(download, data, byteBuffer, _cancellationTokenSource.Token, fileRenameStreamer);
}
}
}
catch (IOException)
{
DownloadCancel?.Invoke(this, new MyDownloadEventArgs());
}
catch (OperationCanceledException)
{
if (download.State == CurrentDownloadState.Cancel)
{
DeleteDownload(download);
}
else if (download.State == CurrentDownloadState.Pause)
{
DownloadPause?.Invoke(this, new MyDownloadEventArgs());
}
else
{
DeleteDownload(download);
}
}
catch (WebException)
{
DownloadCancel?.Invoke(this, new MyDownloadEventArgs());
}
}
private static double SendDownloadProgress(IProgress <MyProgress> onProgressChanged, Model.Download download, double oldPercentDone)
{
var myProgress = new MyProgress()
{
CurrentFileSize = download.GetBytesFromAllParts(),
TotalFileSize = download.TotalFileSize
};
var percentDone = (double)myProgress.CurrentFileSize / myProgress.TotalFileSize;
if (!(percentDone - oldPercentDone > 0.05))
{
return(oldPercentDone);
}
onProgressChanged?.Report(myProgress);
return(percentDone);
}