Window

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