DispatcherTimer doesn't allow event subscription after... RSS

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  fkruesch

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  DispatcherTimer doesn't allow event subscription after timer is started

  Mar 25, 2008 09:21 PM | LINK

  In the following code snippet. the _timer_Tick event will never be called. Obviously
  Silverlight doesn't allow to subscribe to a DispatcherTimer once it runs.

  _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

   

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  Florian Kruesch | MCAD
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  Silverglobe - an open source 3D globe.
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  Allen Chen –...

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  Re: DispatcherTimer doesn't allow event subscription after timer is started

  Mar 27, 2008 08:24 AM | LINK

  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.
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  fkruesch

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  Re: Re: DispatcherTimer doesn't allow event subscription after timer is started

  Mar 27, 2008 10:37 AM | LINK

  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.