您可以通过PlotElement.LabelLine 附加属性添加连接线，如以下XAML代码所示：
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拷贝代码
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<c1:DataSeries.PointLabelTemplate>
<DataTemplate>
<Border BorderBrush="DarkGray" BorderThickness="1" Background="LightGray"
c1:PlotElement.LabelAlignment="Auto"
c1:PlotElement.LabelOffset="30,0">
<TextBlock Text="{Binding Value, StringFormat=0}" />
<c1:PlotElement.LabelLine>
<Line Stroke="LightGray" StrokeThickness="2" />
</c1:PlotElement.LabelLine>
</Border>
</DataTemplate>
</c1:DataSeries.PointLabelTemplate>
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