自定义窗体边框
<Window
BorderBrush="{DynamicResource PrimaryHueDarkBrush}"
BorderThickness="1">
<WindowChrome.WindowChrome>
<WindowChrome ResizeBorderThickness="3"></WindowChrome>
</WindowChrome.WindowChrome>
<Grid>
</Grid>
<Window>
参考:https://www.cnblogs.com/cdaniu/p/16875714.html