Reusing style trigger in wpf

Question

I have done some research on this but failed to find out on how to reuse the style trigger.

I have style trigger set on Label and I am using Data trigger to set content. I have multiple labels in same view and also in different view. The Data bound is of same type except its different property of same data context.

Consider following 2 different labels where I need to display performance of 2 person - PersonA and PersonB. The value displayed for both the labels will be based on Performance format selected.

<Label Grid.Row="5" Grid.Column="9"
HorizontalContentAlignment="Center"
VerticalContentAlignment="Center">
<Label.Style>
    <Style BasedOn="{StaticResource SomeGlobalStaticStyle}" TargetType="Label">
        <Style.Triggers>
            <DataTrigger Binding="{Binding PersonModel.PerformanceFormat}" Value="Fractional">
                <Setter Property="Content"  Value="{Binding DataModel.PersonA.Performance.Value.Fractional}"  />
            </DataTrigger>
            <DataTrigger Binding="{Binding PersonModel.PerformanceFormat}" Value="Decimal">
                <Setter Property="Content"  Value="{Binding DataModel.PersonA.Performance.Value.Decimal}" />                    
            </DataTrigger>
            <DataTrigger Binding="{Binding PersonModel.PerformanceFormat}" Value="US">
                <Setter Property="Content"  Value="{DataModel.PersonA.Performance.Value.US}" />
            </DataTrigger>
        </Style.Triggers>
    </Style>
</Label.Style>

<Label Grid.Row="6" Grid.Column="9"
HorizontalContentAlignment="Center"
VerticalContentAlignment="Center">
<Label.Style>
    <Style BasedOn="{StaticResource SomeGlobalStaticStyle}" TargetType="Label">
        <Style.Triggers>
            <DataTrigger Binding="{Binding PersonModel.PerformanceFormat}" Value="Fractional">
                <Setter Property="Content"  Value="{Binding DataModel.PersonB.Performance.Value.Fractional}"  />
            </DataTrigger>
            <DataTrigger Binding="{Binding PersonModel.PerformanceFormat}" Value="Decimal">
                <Setter Property="Content"  Value="{Binding DataModel.PersonB.Performance.Value.Decimal}" />                    
            </DataTrigger>
            <DataTrigger Binding="{Binding PersonModel.PerformanceFormat}" Value="US">
                <Setter Property="Content"  Value="{DataModel.PersonB.Performance.Value.US}" />
            </DataTrigger>
        </Style.Triggers>
    </Style>
</Label.Style>

If you see, the only difference is the first trigger takes PersonA and the second trigger takes PersonB. I have 10 instances of such label spread in same and multiple views. Is there is way I can define this trigger once in Resources and bind whatever data I want to from each Label.

Looking forward for the solution.

Regards,
Abdyax

Answer 1

configurate setters to obtain values not from Label DataContext, but another Label property - Tag

<Style BasedOn="{StaticResource SomeGlobalStaticStyle}" TargetType="Label">
    <Style.Triggers>
        <DataTrigger Binding="{Binding PersonModel.PerformanceFormat}" Value="Fractional">
            <Setter Property="Content"  Value="{Binding Tag.Performance.Value.Fractional, RelativeSource={RelativeSource Self}}}"  />
        </DataTrigger>
        <DataTrigger Binding="{Binding PersonModel.PerformanceFormat}" Value="Decimal">
            <Setter Property="Content"  Value="{Binding Tag.Performance.Value.Decimal, RelativeSource={RelativeSource Self}}" />
        </DataTrigger>
        <DataTrigger Binding="{Binding PersonModel.PerformanceFormat}" Value="US">
            <Setter Property="Content"  Value="{Binding Tag.Performance.Value.US, RelativeSource={RelativeSource Self}}}" />
        </DataTrigger>
    </Style.Triggers>
</Style>

and bind labels Tag to different properties:

<Label Grid.Row="5" Grid.Column="9"
HorizontalContentAlignment="Center"
VerticalContentAlignment="Center" Tag="{Binding DataModel.PersonA}"/>

<Label Grid.Row="6" Grid.Column="9"
HorizontalContentAlignment="Center"
VerticalContentAlignment="Center" Tag="{Binding DataModel.PersonB}"/>

both labels should pick our default style for TargetType="Label" with triggers

Answer 2

Is there is way I can define this trigger once in Resources and bind whatever data I want to from each Label.

Short answer: No, I am afraid not. You cannot replace the Value of a Setter but reuse the rest of the Style in XAML.

You could create the styles programmatically using the XamlReader.Parse method. Then you can simply replace the "PersonA" with "PersonB" in the string that you pass to the method.

But there is no way to do this generally in pure XAML.