And you can probably use lambda expression with that?

Yes absolutely, for example

UIHelper.SetTimeout(500, () => HtmlPage.Window.Alert("test"));

Thanks for this piece of code. One question - is there a need to somehow "dispose" of the timer after it has been used.. for memory management purposes?

Thank you Zi, you are right we have to add the removal of the delegate. The code is now updated accordingly

window.setTimeout returns an integer -- you can use that with window.clearTimeout( int value ) to cancel a timer...I imagine this could be done using the GetHashCode...use that as a key in a dictionary, something like this:

private static Dictionary<int,DispatcherTimerContainingAction> m_Timers;

If you have SetTimeout return an int, and implement a ClearTimeout method that takes an int...wouldn't that do the trick?

for sure, the only issue is that I expect it will be more resource intense than the solution internal to Silverlight because you'd have to go through the JavaScript - Silverlight bridge each time

Oh...My thought was to do it within Silverlight, here's the code within your solution:

public static class UIHelper 
{ 
		private static Dictionary<int,DispatcherTimerContainingAction> m_Timers; 
 
		// static constructor 
		static UIHelper() 
		{ 
			m_Timers = new Dictionary<int,DispatcherTimerContainingAction>(); 
		} 
		 
		public static int SetTimeout(int milliseconds, Action func) 
		{ 
			int timerKey = new Random().Next(0,1000000); 
			var timer = new DispatcherTimerContainingAction 
							{ 
								Interval = new TimeSpan(0, 0, 0, 0, milliseconds), 
								Action = func, 
							}; 
 
			m_Timers.Add( timer.GetHashCode(), timer ); 
			timer.Tick += _onTimeout; 
			timer.Start(); 
			return timer.GetHashCode(); 
		} 
 
		public static bool ClearTimeout( int TimerHashCode ) 
		{ 
			bool retVal = false; 
			try 
			{ 
				DispatcherTimerContainingAction timer = m_Timers[TimerHashCode]; 
				timer.Stop(); 
				timer.Action = null; 
				timer.Tick -= _onTimeout; 
				if( m_Timers.Remove(TimerHashCode) ) 
				{ 
					retVal = true; 
				} 
				timer = null; 
			} 
			catch(KeyNotFoundException) 
			{ 
			} 
			return retVal; 
		} 
 
		private static void _onTimeout(object sender, EventArgs arg) 
		{ 
			var t = sender as DispatcherTimerContainingAction; 
			try 
			{ 
				m_Timers.Remove(t.GetHashCode()); 
			} 
			catch(ArgumentNullException) 
			{ 
			} 
			t.Stop(); 
			t.Action(); 
			t.Tick -= _onTimeout; 
		} 
	} 
 
	public class DispatcherTimerContainingAction : System.Windows.Threading.DispatcherTimer 
} 

Ah OK, I didn't understand you at first.

If you need to cancel it, then that seems as a reasonable solution. Thanks for sharing the code!

i just wanna say thank you for posting this code...

i had a problem for a game that i m developping for the windows phone and the color was always late... so i had to delay a function ...

thank you again

Hi Geoff,

I am trying to use your code in the comments above to cancel timers - I use it to show a popup window (which has a close button) and I want to cancel the event if it is closed.

I am using the tag property of the window to store it's hashcode eg.
mainPage.windowAppMessages.Tag = UITimer.SetTimeout(secondsToShow * 1000, () =>

I then pass this back in to the cancel event to close it - but I am getting some strange results/browser crashes - does this sound ok?

Thanks!

Hey,
Thanks for this code .. It helped me for my development

Vladimir,
Thanks for the tip. Just what I was looking for.

Geoff,
thanks for the additions.

Pretty simple code , i`m looking forword for more tutorials sir.

Thanks for the tutorial on how to delay an action when using Silverlight. I have come across this problem many times and did not know how to work around it. I never knew about the System.Windows.Threading.DispatcherTimer object. I have a feeling I will be using this a lot in my upcoming projects.

thanks a lot