[Solved] Sum a series label

[Mindy]

I have the below code.  I am trying to format the series label so that it sums all the values of that series.   I know that the below code snippet labelDefinition.Format = "#Sum"; doesn't work.  Can you recommend something?

BarSeries ser = new BarSeries();
ser.ValueBinding = new PropertyNameDataPointBinding("IRBDuration");
ser.CategoryBinding = new PropertyNameDataPointBinding("EndYear");
ser.CombineMode = Telerik.Charting.ChartSeriesCombineMode.Stack;
ser.ShowLabels = true;

ChartSeriesLabelDefinition labelDefinition = new ChartSeriesLabelDefinition();
labelDefinition.Binding = new PropertyNameDataPointBinding("IRBDuration");
labelDefinition.VerticalAlignment = System.Windows.VerticalAlignment.Center;
labelDefinition.HorizontalAlignment = System.Windows.HorizontalAlignment.Center;
labelDefinition.Format = "#SUM";
ser.LabelDefinitions.Add(labelDefinition);
chart.Series.Add(ser);
ser.ItemsSource = _context.Protocols;

[Petar Marchev]

Hello Mindy,

Unfortunately this is not possible out-of-the-box with the ChartView. However using some code behind I think you can get the results you need. Attach a handler to the DataBindingComplete event of the series and apply your logic on changing the labels, in your scenario - hide all labels for a single category, except the last one. The last label should display the sum of the values of all data points for this category. I have attached a simple app to demonstrate this and a snapshot of the output that I get when I run the pp.  

All the best,
Petar Marchev
the Telerik team

[Mindy]

Thanks, I will take a look.  Also, would recommend using the RadChart or the Chartview at this point?

[Petar Marchev]

Hi Mindy,

At this point I would recommend the RadChartView as it is the new charting control.

Greetings,
Petar Marchev
the Telerik team