_timer = new DispatcherTimer();
_timer.Interval = TimeSpan.FromSeconds(0.5);
_timer.Start();
_timer.Tick += new EventHandler(_timer_Tick);

This is quite confusing until you figure it out...
Florian

--
Florian Kruesch | MCAD
rss: www.planet-xaml.net/index.rss
www: xaml-kru.com
Silverglobe - an open source 3D globe.

Hi:

  Thanks for reproting this issue and sorry for confusing you so much. But it's by design and from the msdn we can see the example also attach the event before calling Start method:

http://msdn2.microsoft.com/en-us/library/system.windows.threading.dispatchertimer.aspx

  However it's very kind of you to point it out, which may save other's time.

Thanks again.

Sincerely,
Allen Chen
Microsoft Online Community Support

Please remember to mark the replies as answers if they help and unmark them if they provide no help.

It is confusing, because in WPF proper you can attach an event handler once
the timer is running!

--
Florian Kruesch | MCAD
rss: www.planet-xaml.net/index.rss
www: xaml-kru.com
Silverglobe - an open source 3D globe.