WPF Style does not affect certain properties

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开发者_开发知识库 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.

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

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>