Question

Here is the App.xaml:

<Application>
<Application.Resources>
    <ResourceDictionary>
        <Style TargetType="Window">
            <Setter Property="SnapsToDevicePixels" Value="True"/>
            <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
        </Style>
    </ResourceDictionary>
</Application.Resources>
</Application>

I also have the MainWindow.xaml. When viewed in Design mode in VS, it’s background is, indeed, gray, as it should be. Anyway, when application is running, the window’s background is default white.

Why?

How to fix this? I want all windows to have the standard background by default.

Answer 1

Following up on the answer from CodeNaked, you’ll have to create a Style for every Window you have, but you can use the same style for all of them with BasedOn like this

<Application.Resources>
    <ResourceDictionary>
        <Style TargetType="Window">
            <Setter Property="SnapsToDevicePixels" Value="True"/>
            <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
        </Style>
        <Style TargetType="{x:Type local:MainWindow}"
               BasedOn="{StaticResource {x:Type Window}}"/>
        <Style TargetType="{x:Type local:SomeOtherWindow}"
               BasedOn="{StaticResource {x:Type Window}}"/>
        <!-- Add more Windows here... -->
    </ResourceDictionary>
</Application.Resources