Question

I have the following XAML

<ProgressBar Grid.Column="0" Grid.Row="0" Margin="0,1" Minimum="0" Maximum="100" Value="{Binding Progress}">
    <ProgressBar.Resources>
        <Style TargetType="{x:Type ProgressBar}">
            <Style.Triggers>
                <DataTrigger Binding="{Binding DidAllServicesRestart}" Value="False">
                    <Setter Property="Foreground" Value="DarkRed"/>
                    <Setter Property="Value" Value="100"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </ProgressBar.Resources>
</ProgressBar>

The DataTrigger works great for setting Foreground to DarkRed, but setting the value of the progressbar to 100 does not work. I’m guessing because the {Binding Progress} overrides it?

How can I work around this?

Answer 1

You’re right that the {Binding Progress} overrides it. In the Dependency Property order of precedence, the local value has the 3rd highest priority, whereas the style triggers are 6th.

3) Local value. A local value might be set through the convenience of the “wrapper” property, which also equates to setting as an attribute or property element in XAML, or by a call to the SetValue API using a property of a specific instance. If you set a local value by using a binding or a resource, these each act in the precedence as if a direct value was set.

….

6) Style triggers. The triggers within styles from page or application (these styles might be either explicit or implicit styles, but not from the default styles, which have lower precedence).