private async Task <bool> TryWaitInQueueAsync(CancellationToken cancellationToken)
{
return((_enqueuer != null) && (await _enqueuer.EnqueueAsync(cancellationToken)));
}
/// <summary>
/// try wait in queue as an asynchronous operation.
/// </summary>
/// <param name="requestAbortedCancellationToken">The cancellation token that can be used by other objects or threads to receive notice of cancellation.</param>
/// <returns><c>true</c> if XXXX, <c>false</c> otherwise.</returns>
private async Task <bool> TryWaitInQueueAsync(CancellationToken requestAbortedCancellationToken)
{
return((_enqueuer is not null) && (await _enqueuer.EnqueueAsync(requestAbortedCancellationToken).ConfigureAwait(false)));
}