用户控件不显示其内容

Usercontrol isn't displaying its content

当我尝试使用用户控件时,我偶然发现了这个奇怪的问题,出于某种原因,当我将用户控件添加到 Window 时,它只显示我制作的边框,同时不显示其中的任何内容(无论我将其放置在边框还是网格内)

这是它在设计器中的样子:

这是它在 Window(在设计器和运行时)中的样子:

如图所示,它既不显示按钮也不显示标签。

用户控制:

    <Grid Background="{x:Null}">
        <Border BorderBrush="#FAF9F9" CornerRadius="20" Background="#FAF9F9">
            <Border.Effect>
                <DropShadowEffect Opacity="0.3" ShadowDepth="2" Direction="270"/>
            </Border.Effect>
            <Grid Background="{x:Null}">
                <Label Content="Label" HorizontalAlignment="Left" VerticalContentAlignment="Center" Margin="10,280,0,0" VerticalAlignment="Top" Height="47" Width="428" FontSize="25"/>
                <Button Content="+" HorizontalAlignment="Left" Margin="443,280,0,0" VerticalAlignment="Top" Width="47" Height="47" HorizontalContentAlignment="Center" Foreground="White" FontSize="40" FontWeight="Bold" RenderTransformOrigin="0.5,0.5" BorderBrush="{x:Null}">
                    <Button.Effect>
                        <DropShadowEffect Opacity="0.3" ShadowDepth="2" Direction="270"/>
                    </Button.Effect>
                    <Button.Template >
                        <ControlTemplate TargetType="Button" >
                            <Grid >
                                <Path Stretch="Uniform" UseLayoutRounding="False" Fill="#FFEA1E27">
                                    <Path.Data>
                                        <EllipseGeometry RadiusX="1" RadiusY="1"/>
                                    </Path.Data>
                                </Path>
                                <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
                            </Grid>
                        </ControlTemplate>
                    </Button.Template>
                </Button>
            </Grid>
        </Border>
    </Grid>

看起来您的控件的实际大小小于设计大小。因此,标签和按钮在控件的可见部分之外。

尝试将 LabelButton 相对于右下角和左下角而不是左上角定位。

<Label Content="Label" HorizontalAlignment="Left" Margin="10" VerticalContentAlignment="Center" VerticalAlignment="Bottom" Height="47" Width="428" FontSize="25"/>
<Button Content="+" HorizontalAlignment="Right" Margin="10" VerticalAlignment="Bottom" Width="47" Height="47" HorizontalContentAlignment="Center" Foreground="White" FontSize="40" FontWeight="Bold" RenderTransformOrigin="0.5,0.5" BorderBrush="{x:Null}">