/// <summary>
/// Download a file into a stream.
/// </summary>
/// <param name="path">relative or absolute uri to the file to be downloaded.</param>
/// <param name="ct">a cancellation token</param>
/// <param name="progress">a progress event callback handler</param>
public Task<LiveDownloadOperationResult> DownloadAsync(
string path,
CancellationToken ct,
IProgress<LiveOperationProgress> progress)
{
LiveUtility.ValidateNotNullOrWhiteSpaceString(path, "path");
var tcs = new TaskCompletionSource<LiveDownloadOperationResult>();
var op = new DownloadOperation(
this,
this.GetResourceUri(path, ApiMethod.Download),
progress,
null);
op.OperationCompletedCallback = (LiveDownloadOperationResult result) =>
{
if (result.IsCancelled)
{
tcs.TrySetCanceled();
}
else if (result.Error != null)
{
tcs.TrySetException(result.Error);
}
else
{
tcs.TrySetResult(result);
}
};
ct.Register(op.Cancel);
op.Execute();
return tcs.Task;
}
/// <summary>
/// Download a file into a stream.
/// </summary>
/// <param name="path">relative or absolute uri to the file to be downloaded.</param>
/// <param name="ct">a token that is used to cancel the download operation.</param>
/// <param name="progress">an object that is called to report the download's progress.</param>
/// <returns>A Task object representing the asynchronous operation.</returns>
public Task<LiveDownloadOperationResult> DownloadAsync(
string path,
CancellationToken ct,
IProgress<LiveOperationProgress> progress)
{
if (string.IsNullOrEmpty(path))
{
string message = String.Format(CultureInfo.CurrentUICulture,
ResourceHelper.GetString("UrlInvalid"),
"path");
throw new ArgumentException(message, "path");
}
var tcs = new TaskCompletionSource<LiveDownloadOperationResult>();
var operation = new DownloadOperation(
this,
this.GetResourceUri(path, ApiMethod.Download),
progress != null ? new Action<LiveOperationProgress>(progress.Report) : null,
SynchronizationContextWrapper.Current)
{
OperationCompletedCallback = (LiveDownloadOperationResult result) =>
{
if (result.IsCancelled)
{
tcs.TrySetCanceled();
}
else if (result.Error != null)
{
tcs.TrySetException(result.Error);
}
else
{
tcs.TrySetResult(result);
}
}
};
ct.Register(operation.Cancel);
operation.Execute();
return tcs.Task;
}
