/// <summary>
/// Attach to a pending download operation.
/// </summary>
public async void Attach(BT.DownloadOperation downloadOp)
{
Debug.Assert(downloadOp != null);
this.downloadOp = downloadOp;
this.isAttach = true;
this.cts = new CancellationTokenSource();
var progressHandler = new Progress<BT.DownloadOperation>(this.OnDownloadProgress);
try
{
// Since we don't provide API for apps to attach to pending download operations, we have no
// way to invoke the app event handler to provide any feedback. We would just ignore the result here.
this.downloadOp = await this.downloadOp.AttachAsync().AsTask(this.cts.Token, progressHandler);
}
catch
{
// Ignore errors as well.
}
}
/// <summary>
/// Called when a progress event is raised from the BT.UploadOperation and this
/// will call this TailoredUploadOperation's progress handler.
/// </summary>
private void OnUploadProgress(BT.UploadOperation uploadOp)
{
Debug.Assert(uploadOp != null);
if (uploadOp.Progress.Status == BT.BackgroundTransferStatus.Error ||
uploadOp.Progress.Status == BT.BackgroundTransferStatus.Canceled
|| this.isAttach
|| this.Progress == null)
{
return;
}
this.Progress.Report(
new LiveOperationProgress(
(long)uploadOp.Progress.BytesSent,
(long)uploadOp.Progress.TotalBytesToSend));
}
/// <summary>
/// Called from the BTS.DownloadOperation progress event and raise this's download progress.
/// </summary>
private void OnDownloadProgress(BT.DownloadOperation downloadOp)
{
Debug.Assert(downloadOp != null);
if (downloadOp.Progress.Status != BT.BackgroundTransferStatus.Error &&
downloadOp.Progress.Status != BT.BackgroundTransferStatus.Canceled)
{
if (!this.isAttach)
{
if (this.Progress != null)
{
this.Progress.Report(
new LiveOperationProgress(
(long)downloadOp.Progress.BytesReceived,
(long)downloadOp.Progress.TotalBytesToReceive));
}
}
}
}