margin是自己与父容器的间距
padding是自己与子控件的间距
<Grid Background="AntiqueWhite">
<Border Margin="10" Padding="20" Background="CadetBlue">
<Button Background="BurlyWood"></Button>
</Border>
</Grid>
效果如图所示
Border通过Margin与外部Grid间隔10
Border通过Padding与内部Button间隔20
示例代码
https://github.com/zLulus/NotePractice/tree/dev3/WPF/WpfDemo/MarginAndPadding