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How to: Display the Total Value above each Pie Chart in the WinForms Viewer

  • 2 min to read

This example demonstrates how to access the underlying controls used to display the Pie Item and configure their settings to display the Total value in the title. Total values are calculated automatically if the CalculateHiddenTotals property is enabled. Use the DashboardViewer.GetItemData method to get the total value.

using DevExpress.DashboardCommon.ViewerData;
using DevExpress.DashboardWin;
using DevExpress.XtraBars;
using DevExpress.XtraCharts;
using System.Linq;

namespace Viewer {
    public partial class Form1 : DevExpress.XtraBars.Ribbon.RibbonForm {
        public Form1() {
            InitializeComponent();

            dashboardViewer1.DashboardItemControlUpdated += Viewer_DashboardItemControlUpdated;
            dashboardViewer1.CalculateHiddenTotals = true;
            dashboardViewer1.LoadDashboard(@"..\..\Dashboards\dashboard1.xml");
        }

        private void Viewer_DashboardItemControlUpdated(object sender, DevExpress.DashboardWin.DashboardItemControlEventArgs e) {
            if (e.DashboardItemName == "pieDashboardItem1") {
                var viewer = (DashboardViewer)sender;
                var chart = e.ChartControl;

                var data = viewer.GetItemData(e.DashboardItemName);
                var measure = data.GetMeasures()[0];

                foreach (Series series in chart.Series) {
                    var axisPoint = series.Tag as AxisPoint;
                    if (axisPoint != null) {
                        var total = data.GetSlice(axisPoint).GetValue(measure).DisplayText;
                        var view = series.View as PieSeriesView;
                        if (view != null)
                            view.Titles[0].Text = string.Format("{0} - {1}", series.Name, total);
                    }
                }
            }
        }
    }
}