What I can suggest is that you make each Legend Item Marker's figure to look like the Series it is related to (for example - Square for Bar Series, Line for LineSeries and etc.). For the purpose you can handle the BeforeLayout or PrePaint events of RadChart and customize the Marker.Appearance.Figure of the legend items to any of the predefined figures (unfortunately there is no predefined dashed line figure):
- - Cross
- - Diamond
- - Ellipse
- - Circle
- - Rectangle
- - Star3
- - Star4
- - Star5
- - Star6
What I can suggest you is to set the Figure of the LegendItem Marker to Rectangle and set custom Height and Width for it so that it looks like a Line:
You can find more information on customizing the legend appearance
here.
All the best,
Evgenia
the Telerik team