Override a value in base style's resource

[Mc_Topaz]

I have two style FooStyle and BarStyle. I also have three TextBlocks and two of them use the styles above. In the FooStyle I have specified a double (the Wid parameter) that is used to set the Width of the TextBlock (txt2) to 20. In the BarStyle I would like to use the FooStyle but override the Wid parameter with the value 40 on the TextBlock (txt3). But the txt3 TextBlock's Width don't get a longer Width. It still has the same Width as txt2. Here is my code

        <Style.Resources>
            <sys:Double x:Key="Wid">20</sys:Double>
        </Style.Resources>
        <Setter Property="Width" Value="{StaticResource Wid}" />
        <Setter Property="FontWeight" Value="Bold" />
    
    <Style.Resources>
            <sys:Double x:Key="Wid">40</sys:Double>
        </Style.Resources>

Is it possible to overwrite the Wid parameter in the BarStyle?

[Richard Deeming]

You've assigned the width using a StaticResource. If you want it to change based on the resources of the "derived" style, use DynamicResource instead.

<Setter Property="Width" Value="{DynamicResource Wid}" />

You can then override the value with the resources of a "derived" style:

<Style x:Key="BarStyle" TargetType="TextBlock" BasedOn="{StaticResource FooStyle}">
<Style.Resources>
<sys:Double x:Key="Wid">40</sys:Double>
</Style.Resources>
</Style>

Or directly on the control:

<TextBox Text="txt4" Background="Purple" Style="{StaticResource FooStyle}">
<Style.Resources>
<sys:Double x:Key="Wid">80</sys:Double>
</Style.Resources>
</TextBox>

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"These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

[Mc_Topaz]

Thank you! I got it to work in my example application. But in my real application fail hard. I'll make a new post about it.