当内容为空但边框保持显示时，模板化标签应该不可见

Question

这一定很简单，但现在是星期一早上..我有一个标签并用边框覆盖了模板。当我将 statusLabel.Content 设置为 null 时，我希望标签变得不可见，但标签的边框仍然可见。当 statusLabel.Content 为空时如何消除边框？下面是相关的xaml：

<StackPanel Orientation="Horizontal">
    <Image Name="statusImage" 
           Stretch="None"
           VerticalAlignment="Top"
           Margin="20, 20, 0, 0"/>
    <Label Name="statusLabel" 
        Margin="20, 20, 0, 0"
        VerticalAlignment="Top"
        Background="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=local:StatusLayer}, Path=StatusTextBackground}"
        FontSize ="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=local:StatusLayer},  Path=FontSize}"
        FontStyle="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=local:StatusLayer}, Path=FontStyle}"
        FontWeight="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=local:StatusLayer}, Path=FontWeight}"
        Foreground="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=local:StatusLayer}, Path=StatusTextForeground}"
        FontFamily="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=local:StatusLayer}, Path=FontFamily}" >
        <Label.Template>
            <ControlTemplate TargetType="{x:Type Label}">
                <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="true" CornerRadius="5">
                    <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                </Border>
                <ControlTemplate.Triggers>
                    <Trigger Property="IsEnabled" Value="false">
                        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
                    </Trigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Label.Template>
    </Label>
</StackPanel>

更新：感谢您答案中的代码，它告诉我，我之前尝试让边框消失失败了，因为我之前测试过的触发器（未在我的问题中列出）代码）检查 Value="null" 而不是 Value="{x:Null}"...DOH！使用正确的触发器设置标签上的可见性效果非常好。

Answer 1

在 Border 和 ContentPresenter 中：

Visibility="{TemplateBinding Visibility}"

它解决了问题吗？

我怀疑它确实如此，但尝试不会有什么坏处 :p

否则，您需要添加一个绑定到标签的 Content 属性的 DataTrigger，当它为 null 时，将标签的可见性设置为 Collapsed 或 Hidden。
由于内部控件的可见性现在绑定到标签的可见性，因此所有内容都应该消失。

Answer 2

从我的脑海中浮现出来，完全未经测试：

<Label.Template>
    <ControlTemplate TargetType="{x:Type Label}">
        <Border Name="LabelBorder" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="true" CornerRadius="5">
             <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                </Border>
                <ControlTemplate.Triggers>
                    <Trigger Property="IsEnabled" Value="false">
                        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
                    </Trigger>
                    <Trigger Property="Content" Value="{x:Null}">
                        <Setter ElementName="LabelBorder" Property="Visibility" Value="Hidden"/>
                    </Trigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Label.Template>