WPF Style DataTrigger with binding to DataContext not working
Dependency Properties can be set from many different places; inline, animations, coercion, triggers, etc. As such a Dependency Property Value Precedence list was created and this dictates which changes override which other changes. Because of this order of precedence, we can't use a Trigger to update a property that is explicitly set inline in your XAML. Try this instead:
<Grid> <TextBlock> <TextBlock.Style> <Style BasedOn="{StaticResource TextStyle}" TargetType="TextBlock"> <!-- define your default value here --> <Setter Property="Text" Value="Foo" /> <Style.Triggers> <DataTrigger Binding="{Binding MyBool}" Value="True"> <!-- define your triggered value here --> <Setter Property="Text" Value="Bar" /> </DataTrigger> </Style.Triggers> </Style> </TextBlock.Style> </TextBlock></Grid>