WPF UserControl Style -- How do I set the style from the parent if the control is in an external assembly?

Question

Basically I have the following structure:

<Window ...
        xmlns:my="http://schemas.company.com/WPF/Controls"
        >
    <Window.Resources>
        <Style x:Key="MyStyle1" TargetType={x:Type TextBlock}>
            ...
        </Style>
    </Window.Resources>
    <Grid x:Name="LayoutRoot">
        <my:MyUserControl1 />
        <my:MyUserControl1 />
        <my:MyUserControl2 />
        <my:MyUserControl2 />
    </Grid>
</Window>

<UserControl ...
             >
    <TextBlock Style={ ?? What Goes Here ??} />
</UserControl>

---

How do I apply the style declared in the Window resources so that it goes to the UserControl that is being pulled from an external assembly?

Answer 1

If you want the Style to be applied to all TextBlocks, including the ones in MyUserControl, just leave the x:Key out and it will be applied implictly

<Style TargetType="{x:Type TextBlock}">
    <Setter Property="Foreground" Value="Green"/>
</Style>

---

If you want it to be set explicitly you can use DynamicResource in the UserControls

<Window.Resources>
    <Style x:Key="MyStyle1" TargetType="{x:Type TextBlock}">
        <Setter Property="Foreground" Value="Green"/>
    </Style>
</Window.Resources>
<StackPanel>
    <my:UserControl1 />
    <my:UserControl1 />
    <my:UserControl1 />
    <my:UserControl1 />
</StackPanel>

<UserControl ...>
    <TextBlock Style="{DynamicResource MyStyle1}" Text="TextBlock"/>
</UserControl>