WPF Style does not affect certain properties

Question

I've got a Style specified for Paragraph as part of my FlowDocumentReader's Resources section:

<FlowDocumentReader>
   <FlowDocumentReader.Resources>
      <Style x:Key="myStyle" TargetType="{x:Type Paragraph}">
         <Setter Property="Foreground" Value="LightSteelBlue" />
         <Setter Property="BorderBrush" Value="LightSteelBlue" />
         <Setter Property="BorderThickness" Value="1.0" />
         <Setter Property="FontStyle" Value="Italic" />
         <Setter Property="FontSize" Value="{Binding Path=MyFontSize}" />
      </Style>
   </FlowDocumentReader.Resources>
</FlowDocumentReader>

I've got a .xaml file which contains my FlowDocument and it has some Paragraphs which are defined as so:

<Paragraph Style='{DynamicResource myStyle}">
    Stuff here
</Paragraph>

The problem that I have is that Foreground doesn't apply to the text (it shows as Black rather than LightSteelBlue) and the FontSize does not change when the MyFontSize property is modified.

I've checked the property value in the code behind and it is set but it doesn't result in a change in the UI.

This seems to only be an issue with the FlowDocument if it is loaded into the FlowDocumentReader at runtime. If the XAML is explicitly placed inside the FlowDocumentReader in the .xaml file, the Foreground is the correct color and the FontSize changes based on the property setting.

Ideas?

Solved:

As I wrote in my answer below, by moving the Style block into the Resources section of the FlowDocument itself resolves the issue.

score 0 · Answer 1 · answered Jan 26 '11 at 15:57

0

Have you tried setting foreground for your paragraph directly? it must be a different propety/attached property which manages contents foreground.

answered Jan 26 '11 at 15:57

Yes, if I set paragraph.Foreground = new SolidColorBrush(Colors.Red), it will change the color. – itsmatt Jan 26 '11 at 16:14

score 0 · Accepted Answer · answered Jan 26 '11 at 18:49

Well, I solved this problem by moving the Style blocks out of the FlowDocumentReader Resources and into the Resources section of the FlowDocument itself. The resulting FlowDocument looks something like so:

<FlowDocument>
   <FlowDocument.Resources>
      <Style x:Key="myStyle" TargetType="{x:Type Paragraph}">
         <Setter Property="Foreground" Value="LightSteelBlue" />
         <Setter Property="BorderBrush" Value="LightSteelBlue" />
         <Setter Property="BorderThickness" Value="1.0" />
         <Setter Property="FontStyle" Value="Italic" />
         <Setter Property="FontSize" Value="{Binding Path=MyFontSize}" />
      </Style>
   </FlowDocument.Resources>
   <Paragraph Style="{DynamicResource myStyle}">
      Stuff here
   </Paragraph>
</FlowDocument>

WPF Style does not affect certain properties

2 Answers2