WPF添加外边框，添加外边框虚线

 <Border Background="LightBlue" BorderBrush="Black"  BorderThickness="2" Margin="0,0,-6.2,-2.6" Padding="10">  外边框

<Grid>

 <Rectangle  Fill="white" RadiusX="10" RadiusY="10" Margin="10" Stroke="sc#1.000000, 0.250141, 0.333404, 0.884413" StrokeDashArray="2"/>

<Grid>