I would like to implement a "NullText" behavior for a TextBlock that is bound to a property in a ViewModel. When that property in the ViewModel is null or empty, I would like to display gray italic text something like "No Data". I'd like this to follow MVVM pattern but I am lost...
Update Итак, поигравшись с решением, предложенным Джеймсом Вебстером, я заставил его работать вот так ...
<UserControl.Resources>
<BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter" />
<c:NullOrEmptyValueConverter x:Key="NullOrEmptyValueConverter" Text="(No Data)"/>
</UserControl.Resources>
...
<TextBlock Name="SerialNumberTextBlock" Text="{Binding Path=SerialNumber, Converter={StaticResource NullOrEmptyValueConverter}}">
<TextBlock.Resources>
<Style TargetType="TextBlock">
<Style.Triggers>
<DataTrigger Binding="{Binding ElementName=SerialNumberTextBlock, Path=Text}" Value="(No Data)">
<Setter Property="FontStyle" Value="Italic"/>
</DataTrigger>
</Style.Triggers>
</Style>
</TextBlock.Resources>
</TextBlock>