Question

I would like to hide a progressbar in WPF using databinding. Whenever a property is 0, the progressbar should hide: I try the following code

(Info: My current datacontext is a class that holds an integer property ‘CurrentIndex’)

<ProgressBar Minimum="0" Maximum="100" Value="{Binding CurrentIndex, UpdateSourceTrigger=PropertyChanged}" Visibility="Visible">
    <ProgressBar.Style>
        <Style TargetType="{x:Type ProgressBar}">
            <Style.Triggers>
                <DataTrigger Binding="{Binding CurrentIndex}" Value="0">
                    <Setter Property="Visibility" Value="Hidden"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </ProgressBar.Style>
</ProgressBar>

What is wrong with this code? Why does the progressbar still show up when the CurrentIndex is 0? (in the model behind, the value of ‘CurrentIndex’ is 0 by default, when the control is loaded)

Answer 1

DP precedence, do not set Visibility on the control itself (local value > style).