你必须玩一下才能正确(Margins等),但我会尝试使用BlurEffect填充矩形来模拟阴影:
<Grid>
<!-- shadow -->
<Rectangle HorizontalAlignment="Stretch" VerticalAlignment="Bottom"
Height="..." Fill="#77000000" ... >
<Rectangle.Effect>
<BlurEffect ... />
</Rectangle.Effect>
</Rectangle>
<!-- white border on top of shadow -->
<Border Background="#ffffff" ... >
<!-- other controls -->
</Border>
</Grid>
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