定义虚线框Border

<Border Width="200"     BorderThickness="1" SnapsToDevicePixels="True" HorizontalAlignment="Left" Margin="36,176,0,56">

<Border.BorderBrush>

<DrawingBrush >

<DrawingBrush.Drawing>

<GeometryDrawing>

<GeometryDrawing.Pen >

<Pen Brush="White" Thickness="1">

<Pen.DashStyle>

<DashStyle Dashes="5,2,1,2"></DashStyle>

</Pen.DashStyle>

</Pen>

</GeometryDrawing.Pen>

<GeometryDrawing.Geometry>

<RectangleGeometry  Rect="0,0,200,200"   RadiusX="1" RadiusY="1">

 

</RectangleGeometry>

</GeometryDrawing.Geometry>

</GeometryDrawing>

</DrawingBrush.Drawing>

</DrawingBrush>

</Border.BorderBrush>

 

</Border>

    <Setter Property="StrokeThickness"

                    Value="{Binding Height, RelativeSource={RelativeSource Self}}"/>