Blocking and waiting for an event

Question

It sometimes want to block my thread while waiting for a event to occur.

I usually do it something like this:

private AutoResetEvent _autoResetEvent          


        

Answer 1

I modified Dead.Rabit's class EventWaiter to handle EventHandler. So you can use for waiting all events type of EventHandler, that means your delegate is something like delegate void SomeDelegate(object sender, T EventsArgs).

 public class EventWaiter
{

    private AutoResetEvent _autoResetEvent = new AutoResetEvent(false);
    private EventInfo _event = null;
    private object _eventContainer = null;

    public EventWaiter(object eventContainer, string eventName)
    {
        _eventContainer = eventContainer;
        _event = eventContainer.GetType().GetEvent(eventName);
    }

    public void WaitForEvent(TimeSpan timeout)
    {
        EventHandler eventHandler = new EventHandler((sender, args) => { _autoResetEvent.Set(); });
        _event.AddEventHandler(_eventContainer, eventHandler);
        _autoResetEvent.WaitOne(timeout);
        _event.RemoveEventHandler(_eventContainer, eventHandler);
    }
}

And for example I use that for waiting to get Url from HttpNotificationChannel when I registering to windows push notification service.

            HttpNotificationChannel pushChannel = new HttpNotificationChannel(channelName);
            //ChannelUriUpdated is event 
            EventWaiter ew = new EventWaiter(pushChannel, "ChannelUriUpdated");
            pushChannel.Open();
            ew.WaitForEvent(TimeSpan.FromSeconds(30));