在整个应用程序中按下按钮时播放声音

Question

I have a WPF application that should be used on a touch screen. I have been asked to play a sound when a button is pressed on the screen, for the whole application. My idea was to create a style to do this, include the resource dictionnary in my app.It works quite well. However, this style is in a separate DLL and I would like my main application to change the path of the sound file (BoutonClickSound Url below). But I could not find a way to do it. I have tried several ugly things like :

    System.Windows.Application.Current.Resources.MergedDictionaries[0]["BoutonClickSound"] = new Uri(m_MainVM.ButClickSoundPath);
System.Windows.Application.Current.Resources.MergedDictionaries[0].MergedDictionaries[0]["BoutonClickSound"] = new Uri(m_MainVM.ButClickSoundPath);

But none of them seems to work...

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                xmlns:primitives="clr-namespace:System.Windows.Controls.Primitives;assembly=PresentationFramework"
                xmlns:sys="clr-namespace:System;assembly=System">

<sys:Uri x:Key="BoutonClickSound">c:\buttonclick.wav</sys:Uri>

<Style TargetType="{x:Type FrameworkElement}"  x:Key="SoundButton">
    <Style.Triggers>
        <EventTrigger RoutedEvent="PreviewMouseDown">
            <SoundPlayerAction x:Name="SoundPlayer" Source="{DynamicResource BoutonClickSound}" />
        </EventTrigger>
    </Style.Triggers>
</Style>

<Style TargetType="{x:Type primitives:Selector}"  x:Key="SoundSelectionChange">
    <Style.Triggers>
        <EventTrigger RoutedEvent="SelectionChanged">
            <SoundPlayerAction x:Name="SoundPlayer" Source="{DynamicResource BoutonClickSound}" />
        </EventTrigger>
    </Style.Triggers>
</Style>

Any idea how to do this ?

Thank you.

Answer 1

Just declare a local resource with the same key.

If you want it globally in your application, you can add it to a MergedDictionary after you include the MergedDictionary from your library.

Add another entry like this:

<sys:Uri x:Key="BoutonClickSound">c:\differentfile.wav</sys:Uri>

And it should cause your style to use that file instead.

Edit:

To set the resource in the code-behind, first you must add it to the local resource dictionary:

Resources.Add("BoutonClickSound", new Uri("your uri here"));

After you add it, if you want to later change it, you can't re-add it, you have to modify it:

Resources["BoutonClickSound"] = new Uri("your uri here");