WPF -- 叠加多个 Style 的效果

 效果：

 

 

XAML代码：

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition />
        <RowDefinition />
    </Grid.RowDefinitions>
    <Grid.Resources>
        <Style TargetType="Button" x:Key="Bold">
            <Setter Property="FontWeight" Value="Bold" />
        </Style>
        <Style TargetType="Button"
               BasedOn="{StaticResource Bold}">
        </Style>
        <Style TargetType="Button"
               BasedOn="{StaticResource Bold}"
               x:Key="Yellow">
            <Setter Property="Background" Value="Yellow" />
        </Style>
    </Grid.Resources>
    <Button Grid.Row="0" Content="Bold" />
    <Button Grid.Row="1" Content="Bold + Yellow"
            Style="{StaticResource Yellow}" />
</Grid>