WPF Window.Resources VS Application.Resources

Question

我在Window.Resources中以“ MenuItem”样式创建了一些动画

        <Style TargetType="MenuItem">
        <Setter Property="Foreground" Value="White"/>
        <Setter Property="FontSize" Value="10"/>
        <Setter Property="Background">
            <Setter.Value>
                <SolidColorBrush Color="#2e3137"/>
            </Setter.Value>
        </Setter>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type MenuItem}">
                    <Border x:Name="Bd" Padding="17,0,17,0" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="#2e3137" SnapsToDevicePixels="True" Uid="Border_38">
                        <ContentPresenter x:Name="ContentPresenter"  Content="{TemplateBinding Header}" Grid.Column="1" ContentSource="Header" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" Uid="ContentPresenter_33"/>
                    </Border>
                    <ControlTemplate.Triggers>
                        <EventTrigger RoutedEvent="MenuItem.MouseEnter">
                            <BeginStoryboard>
                                <Storyboard>
                                    <ColorAnimation To="Gray" Storyboard.TargetProperty="(MenuItem.Background).(SolidColorBrush.Color)" Duration="0:0:0.3"/>
                                </Storyboard>
                            </BeginStoryboard>
                        </EventTrigger>
                        <EventTrigger RoutedEvent="MenuItem.MouseLeave">
                            <BeginStoryboard>
                                <Storyboard>
                                    <ColorAnimation To="Transparent" Storyboard.TargetProperty="(MenuItem.Background).(SolidColorBrush.Color)" Duration="0:0:0.3"/>
                                </Storyboard>
                            </BeginStoryboard>
                        </EventTrigger>
                        <Trigger Property="IsEnabled" Value="False">
                            <Setter Property="Opacity" TargetName="Bd" Value="0.56"/>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

这个很好用。但是后来我意识到我需要将样式移动到Application.Resources，因为我需要在不同的窗口中使用此样式，但是当我将其移动时，动画会停止工作并显示错误：“背景”属性未指向路径中的DependencyObject'（ 0）。（1）'。那么，这些资源之间有什么区别以及如何解决我的问题？谢谢。

UPD ：发现不是菜单项而是标签的问题，奇怪的是我只将此样式设置为标签

    <Style TargetType="Label">
        <Setter Property="Foreground" Value="White"/>
        <Setter Property="FontSize" Value="14"/>
    </Style>