Setting Custom Colors in DataSeries.Loaded Event

You can set different colors for the data point in the same series using the Loaded event like the following:

DataSeries ds = new DataSeries()

 {

   ValuesSource = new double[] {-2, -1, 1, 2, 2, 1, -1, -3 }

 };

SolidColorBrush red = new SolidColorBrush(Colors.Red);

SolidColorBrush blue = new SolidColorBrush(Colors.Blue);

ds.Loaded += (s, e) =>

   {

     PlotElement pe = s as PlotElement;

     if (pe != null &&

       pe.DataPoint.PointIndex >= 0) // only points

     {

       // set color depending on point value

       if (pe.DataPoint.Value >= 0)

         pe.Fill = red;

       else

         pe.Fill = blue;

     }

   };

chart.Data.Children.Add(ds);

chart.ChartType = ChartType.LineSymbols;