I wrote this code and got an exception:
Background property does not point to a dependencyobject in path '(0).(1)'
I saw this problem in other posts in the forum but didn't founded a solution.
<WrapPanel.Style>
<Style>
<Style.Triggers>
<Trigger Property "WrapPanel.Visibility" Value="Visible">
<Trigger.EnterActions>
<BeginStoryboard HandoffBehavior="Compose">
<Storyboard RepeatBehavior="Forever" AutoReverse="True">
<ColorAnimation
Storyboard.TargetProperty="(WrapPanel.Background).(SolidColorBrush.Color)"
Duration="00:00:01" To="Red"/>
</Storyboard>
</BeginStoryboard>
</Trigger.EnterActions>
</Trigger>
</Style.Triggers>
</Style>
</WrapPanel.Style>
Any help with this?
You most likely failed to set a value for the initial background brush. You can either do so with a style setter, or else just set a value on the panel directly. The style setter is probably better:
<Setter Property="Background">
<Setter.Value>
<SolidColorBrush Color="Blue"/>
</Setter.Value>
</Setter>
Note that you can also specify the TargetType
property on your style, so that you don't have to prefix all property reference with WrapPanel
:
<Style TargetType="WrapPanel">
You must set the Background property of the WrapPanel! Otherwise the WPF subsystem doesn't recognize it as a SolidColorBrush (could be another brush as well).
<WrapPanel Background="White">
...
</WrapPanel>
is sufficient.
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