/// <summary>
/// Performs the BackgroundDownloadOperation.
/// </summary>
public async Task <LiveOperationResult> ExecuteAsync()
{
Debug.Assert(this.status != OperationStatus.Completed, "Cannot execute on a completed operation.");
var builder = new BackgroundDownloadRequestBuilder
{
AccessToken = this.accessToken,
DownloadLocationOnDevice = this.downloadLocationOnDevice,
RequestUri = this.requestUri,
TransferPreferences = this.transferPreferences
};
this.request = builder.Build();
var eventAdapter = new BackgroundDownloadEventAdapter(this.backgroundTransferService, this.tcs);
Task <LiveOperationResult> task = this.progress == null?
eventAdapter.ConvertTransferStatusChangedToTask(this.request) :
eventAdapter.ConvertTransferStatusChangedToTask(this.request, this.progress);
Debug.Assert(this.tcs.Task == task, "EventAdapter returned a different task. This could affect cancel.");
// if the request has already been cancelled do not add it to the service.
if (this.status != OperationStatus.Cancelled)
{
this.backgroundTransferService.Add(this.request);
this.status = OperationStatus.Started;
}
LiveOperationResult result = await task;
this.status = OperationStatus.Completed;
return(result);
}
/// <summary>
/// Attaches to the pending download and receive the result of the operation when it is finished.
/// </summary>
/// <param name="ct">a token that is used to cancel the background download operation.</param>
/// <param name="progress">an object that is called to report the background download's progress.</param>
/// <returns>A Task object representing the asynchronous operation.</returns>
public Task <LiveOperationResult> AttachAsync(CancellationToken ct, IProgress <LiveOperationProgress> progress)
{
var tcs = new TaskCompletionSource <LiveOperationResult>();
ct.Register(() =>
{
// remove from service to cancel.
this.backgroundTransferService.Remove(this.request);
tcs.TrySetCanceled();
});
var downloadEventAdapter = new BackgroundDownloadEventAdapter(this.backgroundTransferService, tcs);
return(downloadEventAdapter.ConvertTransferStatusChangedToTask(this.request, progress));
}
/// <summary>
/// Performs the BackgroundDownloadOperation.
/// </summary>
public async Task<LiveOperationResult> ExecuteAsync()
{
Debug.Assert(this.status != OperationStatus.Completed, "Cannot execute on a completed operation.");
var builder = new BackgroundDownloadRequestBuilder
{
AccessToken = this.accessToken,
DownloadLocationOnDevice = this.downloadLocationOnDevice,
RequestUri = this.requestUri,
TransferPreferences = this.transferPreferences
};
this.request = builder.Build();
var eventAdapter = new BackgroundDownloadEventAdapter(this.backgroundTransferService, this.tcs);
Task<LiveOperationResult> task = this.progress == null ?
eventAdapter.ConvertTransferStatusChangedToTask(this.request) :
eventAdapter.ConvertTransferStatusChangedToTask(this.request, this.progress);
Debug.Assert(this.tcs.Task == task, "EventAdapter returned a different task. This could affect cancel.");
// if the request has already been cancelled do not add it to the service.
if (this.status != OperationStatus.Cancelled)
{
this.backgroundTransferService.Add(this.request);
this.status = OperationStatus.Started;
}
LiveOperationResult result = await task;
this.status = OperationStatus.Completed;
return result;
}
