Change background color on a selected Item in WPF with XAML [duplicate]

Question

Basically, I want have a listBox and I want to change the color of the background and foreground of the item that I currently have selected.

I tried this:

<Style TargetType="ListBoxItem" BasedOn="{StaticResource {x:Type ListBoxItem}}"> <Style.Triggers> <Trigger Property="IsSelected" Value="True"> <Setter Property="Background" Value="Yellow"/> </Trigger> <Trigger Property="IsMouseOver" Value="True"> <Setter Property="Background" Value="#FFAFA212"/> </Trigger> </Style.Triggers> </Style>

But it didn't do anything at all. I tried searching for it but nothing i tried seemed to work, can anyone help please? This is an App.xaml in a c# project btw.

@KlausGütter it does somewhat, but the background is not changing, just the foreground, but thank you — WPFCCQQR
– WPFCCQQR, Commented Feb 11, 2023 at 14:36

Andy · Accepted Answer · 2023-02-11 22:15:10Z

It's more complicated than you might imagine because of how wpf uses control templates to build controls.

The templates for a listbox and listboxitem is here:

https://learn.microsoft.com/en-us/dotnet/desktop/wpf/controls/listbox-styles-and-templates?view=netframeworkdesktop-4.8

There are a number of ways you could accomplish this but I think the most informative would be to re template.

Here's something to take a look at. Put this in a parent control ( like the window or grid) resources:

 <Style x:Key="{x:Type ListBoxItem}" TargetType="ListBoxItem"> <Setter Property="SnapsToDevicePixels" Value="true" /> <Setter Property="OverridesDefaultStyle" Value="true" /> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="ListBoxItem"> <Border x:Name="Border" Padding="2" SnapsToDevicePixels="true"> <Border.Background> <SolidColorBrush Color="Transparent" /> </Border.Background> <VisualStateManager.VisualStateGroups> <VisualStateGroup x:Name="SelectionStates"> <VisualState x:Name="Unselected" /> <VisualState x:Name="Selected"> <Storyboard> <ColorAnimationUsingKeyFrames Storyboard.TargetName="Border" Storyboard.TargetProperty="(Panel.Background). (SolidColorBrush.Color)"> <EasingColorKeyFrame KeyTime="0" Value="Yellow" /> </ColorAnimationUsingKeyFrames> </Storyboard> </VisualState> <VisualState x:Name="SelectedUnfocused"> <Storyboard> <ColorAnimationUsingKeyFrames Storyboard.TargetName="Border" Storyboard.TargetProperty="(Panel.Background). (SolidColorBrush.Color)"> <EasingColorKeyFrame KeyTime="0" Value="Yellow" /> </ColorAnimationUsingKeyFrames> </Storyboard> </VisualState> </VisualStateGroup> <VisualStateGroup x:Name="CommonStates"> <VisualState x:Name="Normal"/> <VisualState x:Name="MouseOver"> <Storyboard> <ColorAnimationUsingKeyFrames Storyboard.TargetName="Border" Storyboard.TargetProperty="(Panel.Background). (SolidColorBrush.Color)"> <EasingColorKeyFrame KeyTime="0" Value="#FFAFA212" /> </ColorAnimationUsingKeyFrames> </Storyboard> </VisualState> </VisualStateGroup> </VisualStateManager.VisualStateGroups> <ContentPresenter /> </Border> </ControlTemplate> </Setter.Value> </Setter> </Style>

Note that only one visual group can apply at a time and the last one wins.

There are subtleties to this.

See the line

 <VisualState x:Name="Normal"/>

Remove that and see what happens

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