Change Slider's value in XAML throw an exception

Question

I have a problem with WPF : I would like use a slider in my XAML with an default value but when i do it, an exception is thrown :

An unhandled exception of type 'System.Reflection.TargetInvocationException' occurred in PresentationFramework.dll

this is my code:

<Slider Height="23" HorizontalAlignment="Center" Name="sliderVolume" VerticalAlignment="Top" Width="66" Grid.Row="2" ValueChanged="volume_ValueChanged" Margin="598,35,12,0" Value="100"/>

and this is my code is .cs :

private void volume_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
{
    mediaElement.Volume = sliderVolume.Value;
}

without the default value

Value"100"

It works !

private void volume_ValueChanged(object sender, RoutedPropertyChangedEventArgs e) {mediaElement.Volume = sliderVolume.Value;} — Gims, Feb 07 '13 at 15:02
Have you tried enabling "first chance" exceptions in the debugger, to catch the precise moment when the exception occurs? http://stackoverflow.com/questions/116896/visual-studio-how-to-break-on-handled-exceptions Try that and update the question with some additional details. — BTownTKD, Feb 07 '13 at 15:06

score 1 · Answer 1 · answered Feb 07 '13 at 14:57

1

I don't see a minimum and maximum value defined. Your "default" value may be out of range.

answered Feb 07 '13 at 14:57

BTownTKD

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Nathan Hillyer · Answer 2 · 2013-02-07T15:16:11.490

1

The MediaElement volume property is represented on a linear scale between 0 and 1.

Try:

mediaElement.Volume = sliderVolume.Value / 10;

edited Feb 07 '13 at 15:16

answered Feb 07 '13 at 15:07

Nathan Hillyer

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It works now, but without block try{} catch{} an exception is thrown every time. – Gims Feb 07 '13 at 15:24
Add AbZy's slider Xaml with mediaElement.Volume = sliderVolume.Value; – Nathan Hillyer Feb 07 '13 at 15:26
Can you post the inner exception? – Nathan Hillyer Feb 07 '13 at 15:38

Abdusalam Ben Haj · Accepted Answer · 2013-02-07T15:37:44.307

1

According to MSDN . Maximum volume allowed is 1.

The media's volume represented on a linear scale between 0 and 1. The default is 0.5.

So you need to set your slider like this :

<Slider Value="0.5" Minimum="0" Maximum="1" Height="23" HorizontalAlignment="Center"
Name="sliderVolume" VerticalAlignment="Top" Width="66" Grid.Row="2"
ValueChanged="volume_ValueChanged" Margin="598,35,12,0" />

Code :

private void volume_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> args)
      {
         mediaElement.Volume = (double)sliderVolume.Value;
      }

edited Feb 07 '13 at 15:37

answered Feb 07 '13 at 15:19

Abdusalam Ben Haj

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Always the same, it works fine, nevertheless an exception is thrown without blocks try{} catch{} – Gims Feb 07 '13 at 15:32
ok it's works fine now. In my xaml I declared my mediaElement after my slider, so when I ran my projet, mediaElement was NULL. I'm sorry and Thank you very much. – Gims Feb 07 '13 at 15:44

Change Slider's value in XAML throw an exception

3 Answers3