我怎样才能让这个边境的Silverlight元素的下边框有一个红色的点缀里面红色的实行？

 边境边境=新的边界（）;
border.CornerRadius =新CornerRadius（5）;
border.BorderThickness =新厚度（0，0，0，1）;
border.BorderBrush =新的SolidColorBrush（Colors.Red）;
 

解决方案

你能有一个网格替换的边界，并给它一个矩形覆盖整个区域？

 ＆LT;矩形拉伸=填充半径=10半径=10StrokeDashArray =10 2中风=黑补=白/＆GT;
 

该StrokeDashArray可以用来绘制点缀而是一个边界没有这样的属性。

编辑：

由于我注意到你只是点缀下边框你可以做这样的事情

 ＆LT;边框宽度=100高度=100背景=蓝了borderThickness =0,0,0,1＆GT;
    ＆LT; Border.BorderBrush＆GT;
        ＆LT;2,0一个LinearGradientBrush StartPoint可以=0,0的EndPoint = S preadMethod =重复＆GT;
            ＆LT; GradientStopCollection＆GT;
                ＆LT;渐变停止颜色=透明偏移量=0/＆GT;
                ＆LT;渐变停止颜色=透明偏移=0.3/＆GT;
                ＆LT;渐变停止颜色=红偏移=0.3/＆GT;
                ＆LT;渐变停止颜色=红偏移=0.6/＆GT;
                ＆LT;渐变停止颜色=透明偏移=0.6/＆GT;
                ＆LT;渐变停止颜色=透明偏移=1/＆GT;
            ＆LT; / GradientStopCollection＆GT;
        ＆LT; /一个LinearGradientBrush＆GT;
    ＆LT; /Border.BorderBrush>
＆LT; /边框＆GT;
 

调整偏移的中间两个渐变停止的调整红点/破折号的宽度。您可能还需要调整的终结点，使其重复你想要的时间间隔。

How can I make the bottom border of this Border Silverlight element have a red dotted inside of a red solid line?

Border border = new Border();
border.CornerRadius = new CornerRadius(5);
border.BorderThickness = new Thickness(0, 0, 0, 1);
border.BorderBrush = new SolidColorBrush(Colors.Red);

Can you replace the border with a Grid and give it a Rectangle that fills the whole area?

<Rectangle Stretch="Fill" RadiusX="10" RadiusY="10" StrokeDashArray="10, 2" Stroke="Black" Fill="White" />

The StrokeDashArray can be used to draw it dotted but a Border has no such property.

EDIT:

Since I noticed you are only dotting the bottom border you could do something like this

<Border Width="100" Height="100" Background="Blue" BorderThickness="0,0,0,1">
    <Border.BorderBrush>
        <LinearGradientBrush StartPoint="0,0" EndPoint=".2,0" SpreadMethod="Repeat" >
            <GradientStopCollection>
                <GradientStop Color="Transparent" Offset="0" />
                <GradientStop Color="Transparent" Offset="0.3" />
                <GradientStop Color="Red" Offset="0.3" />
                <GradientStop Color="Red" Offset="0.6" />
                <GradientStop Color="Transparent" Offset="0.6" />
                <GradientStop Color="Transparent" Offset="1" />
            </GradientStopCollection>
        </LinearGradientBrush>
    </Border.BorderBrush>
</Border>

Adjust the Offset of the middle two GradientStop's to adjust the width of the red dot/dash. You may also need to adjust the endpoint to make it repeat at your desired interval.