WPF apply style only in particular conditions - wpf

Question

I had to adapt the visual stye of my combobox due to migration from Win7 to Win10, so here's my current style for custom Combobox:
<Style TargetType="{x:Type av:XComboBox}">
<Setter Property="UIElement.SnapsToDevicePixels" Value="True"/>
<Setter Property="FrameworkElement.OverridesDefaultStyle" Value="True"/>
<Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
<Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
<Setter Property="ScrollViewer.CanContentScroll" Value="True"/>
<Setter Property="TextElement.Foreground" Value="Black"/>
<Setter Property="FrameworkElement.FocusVisualStyle" Value="{x:Null}"/>
<Setter Property="Control.Template">
<Setter.Value>
<ControlTemplate TargetType="ComboBox">
<Grid>
<ToggleButton Name="ToggleButton" Grid.Column="2"
ClickMode="Press" Focusable="False"
IsChecked="{Binding Path=IsDropDownOpen, RelativeSource={RelativeSource TemplatedParent}, Mode=TwoWay}"
Template="{StaticResource ComboBoxToggleButtonTemplate}"/>
<ContentPresenter Name="ContentSite" Margin="5, 3, 23, 3" IsHitTestVisible="False"
HorizontalAlignment="Left" VerticalAlignment="Center"
Content="{TemplateBinding ComboBox.SelectionBoxItem}"
ContentTemplate="{TemplateBinding ComboBox.SelectionBoxItemTemplate}"
ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}"/>
<TextBox Name="PART_EditableTextBox" Margin="1, 3, 23, 3" IsReadOnly="{TemplateBinding IsReadOnly}" Visibility="Hidden" Background="Transparent" HorizontalAlignment="Left" VerticalAlignment="Center" Focusable="True" >
<TextBox.Template>
<ControlTemplate TargetType="TextBox" >
<Border Name="PART_ContentHost" Focusable="False" />
</ControlTemplate>
</TextBox.Template>
</TextBox>
<!-- Popup showing items -->
<Popup Name="Popup" Placement="Bottom" Focusable="False" AllowsTransparency="True" IsOpen="{TemplateBinding ComboBox.IsDropDownOpen}" PopupAnimation="Slide">
<Grid Name="DropDown" SnapsToDevicePixels="True" MinWidth="{TemplateBinding FrameworkElement.ActualWidth}" MaxHeight="{TemplateBinding ComboBox.MaxDropDownHeight}">
<Border Name="DropDownBorder" Background="White" Margin="0, 1, 0, 0" CornerRadius="0" BorderThickness="1,1,1,1" BorderBrush="{StaticResource ComboBoxNormalBorderBrush}"/>
<ScrollViewer Margin="4" SnapsToDevicePixels="True">
<ItemsPresenter KeyboardNavigation.DirectionalNavigation="Contained" />
</ScrollViewer>
</Grid>
</Popup>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="ItemsControl.HasItems" Value="False">
<Setter Property="FrameworkElement.MinHeight" TargetName="DropDownBorder" Value="95"/>
</Trigger>
<Trigger Property="UIElement.IsEnabled" Value="False">
<Setter Property="TextElement.Foreground" Value="{StaticResource ComboBoxDisabledForegroundBrush}"/>
</Trigger>
<Trigger Property="ComboBox.IsVisible" Value="True">
<Setter Property="Border.BorderBrush" TargetName="DropDownBorder" Value="#878787"/>
</Trigger>
<Trigger Property="ItemsControl.IsGrouping" Value="True">
<Setter Property="ScrollViewer.CanContentScroll" Value="False"/>
</Trigger>
<Trigger Property="ComboBox.IsEditable" Value="True">
<Setter Property="KeyboardNavigation.IsTabStop" Value="False"/>
<Setter Property="UIElement.Visibility" TargetName="PART_EditableTextBox" Value="Visible"/>
<Setter Property="UIElement.Visibility" TargetName="ContentSite" Value="Hidden"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
As the application runs both on Win7 and Win10, I would apply that style only on Win10. Is there any way to do this? I couldn't fine anything regarding this; I thought about a converter, but how to apply it?

Answer 1

You could give your Style an x:Key and implement a custom markup extension:
public class Windows10StyleExtension : MarkupExtension
{
private readonly string _key;
public Windows10StyleExtension(string key)
{
_key = key;
}
public override object ProvideValue(IServiceProvider serviceProvider)
{
if (!IsWindows7OrLower)
return new StaticResourceExtension(_key).ProvideValue(serviceProvider);
return null;
}
private bool IsWindows7OrLower =>
(Environment.OSVersion.Version.Major + (double)Environment.OSVersion.Version.Minor / 10) <= 6.1;
}
XAML:
<Style x:Key="style" TargetType="{x:Type av:XComboBox}">
...
<av:XComboBox Style="{local:Windows10Style style}" />