XAML: x:Array of static resources - wpf

Question

I have a number of BitmapImages declared in my ResourceDictionary:
<BitmapImage x:Key="LockImageSource" UriSource="img/lock.png" />
<BitmapImage x:Key="UnlockImageSource" UriSource="img/unlock.png" />
...
My converter takes an array parameter of two ImageSource elements to choose one of images to show depending on passed value:
<Image Source="{Binding Path=IsLocked,
Converter={StaticResource AlteringConverter},
ConverterParameter={StaticResource LockUnlockImageSourcePair}}"
Width="16" Height="16" />
How should LockUnlockImageSourcePair resource look like?
<x:Array x:Key="LockUnlockImageSourcePair" Type="{x:Type BitmapImage}">
<??? />
<??? />
</x:Array>

Answer 1

Instead of a Binding with a Converter and complicated ConverterParameter, you could use this simple Style with a DataTrigger:
<Image Width="16" Height="16">
<Image.Style>
<Style TargetType="Image">
<Setter Property="Source" Value="{StaticResource UnlockImageSource}"/>
<Style.Triggers>
<DataTrigger Binding="{Binding IsLocked}" Value="True">
<Setter Property="Source" Value="{StaticResource LockImageSource}"/>
</DataTrigger>
</Style.Triggers>
</Style>
</Image.Style>
</Image>
If you want to reuse the Style for multiple Image controls, you may declare it as resource:
<Style x:Key="LockUnlockImageStyle" TargetType="Image">
<Setter Property="Width" Value="16"/>
<Setter Property="Height" Value="16"/>
<Setter Property="Source" Value="{StaticResource UnlockImageSource}"/>
<Style.Triggers>
<DataTrigger Binding="{Binding IsLocked}" Value="True">
<Setter Property="Source" Value="{StaticResource LockImageSource}"/>
</DataTrigger>
</Style.Triggers>
</Style>
...
<Image Style="{StaticResource LockUnlockImageStyle}"/>