为什么我的ReactiveExtensions msmq包装器不能继续监听？

Question

任何人都可以确定为什么一次收听MSMQ，然后退出？我认为DoWhile()会让它保持监听，但是当启动时队列中有消息时，它会处理它们一次然后退出。在StopRequested之前是否有更合适的倾听方式？

public virtual void RunProcessor()
{
    _stopRequested = false;
    MessageQueue mq = null;
    try
    {
        //create a subscribable stream from the msmq async BeginRecieve event
        mq = GetMessageQueue();
        var msmqListener =
            Observable.FromAsync(() => Task<Message>.Factory.FromAsync(mq.BeginReceive(), mq.EndReceive));
        Subscribe(msmqListener.DoWhile(() => !StopRequested));
    }
    catch (Exception ex)
    {
        if ((ex is ThreadAbortException) || (ex is ThreadInterruptedException)) throw;
        _logger.Error("Alert processor thread threw an exception", ex);
    }
    finally
    {
        mq?.Close();
    }
}