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XRChart.RegisterGlobalSummaryFunction(String, String, Nullable<ScaleType>, Int32, SummaryFunctionArgumentDescription[], SummaryFunction) Method

Registers the custom summary function with the specified settings for all XRChart controls in the application.

Namespace: DevExpress.XtraReports.UI

Assembly: DevExpress.XtraReports.v18.2.dll


public static void RegisterGlobalSummaryFunction(
    string name,
    string displayName,
    ScaleType? resultScaleType,
    int resultDimension,
    SummaryFunctionArgumentDescription[] argumentDescriptions,
    SummaryFunction function
Public Shared Sub RegisterGlobalSummaryFunction(
    name As String,
    displayName As String,
    resultScaleType As ScaleType?,
    resultDimension As Integer,
    argumentDescriptions As SummaryFunctionArgumentDescription(),
    function As SummaryFunction


Name Type Description
name String

A String value containing the function's name.

displayName String

A String value containing the function's display name, which is used for localization purposes.

resultScaleType Nullable<ScaleType>

A ScaleType enumeration value representing the type of the function's result.

resultDimension Int32

An integer value representing the dimension of the resulting series point's values.

argumentDescriptions SummaryFunctionArgumentDescription[]

An array of SummaryFunctionArgumentDescription objects containing argument descriptions.

function SummaryFunction

A SummaryFunction delegate to be registered.


The RegisterGlobalSummaryFunction method is intended to register custom summary functions to be used by all chart controls in the application.

To unregister a specific summary function, call the UnregisterGlobalSummaryFunction(String) method.

The following example demonstrates how to create a custom summary function that returns a product of two values (Price * Count). To accomplish this task, it is required to create a summary function delegate and register it via the RegisterGlobalSummaryFunction method.

using DevExpress.XtraCharts;
using DevExpress.XtraReports.UI;
static class Program {
  // Declare the Product summary function.
  private static SeriesPoint[] CalculateProductValue(
    Series series,
    object argument,
    string[] functionArguments,
    DataSourceValues[] values,
    object[] colors) {

    // Create an array of the resulting series points.
    List<SeriesPoint> points = new List<SeriesPoint>();
    // Calculate the resulting series points as Price * Count.
    for (int i = 0; i < values.Length; i++)
      double value = Convert.ToDouble(values[i][functionArguments[0]]) *
      if (value > 0)
        points.Add(new SeriesPoint(argument, value));
    // Return the result.
    return points.ToArray();
  static void Main() {
    XRChart.RegisterGlobalSummaryFunction("PRODUCT", "PRODUCT", ScaleType.Auto, 1,
        new SummaryFunctionArgumentDescription[] {
            new SummaryFunctionArgumentDescription("Price", ScaleType.Numerical),
            new SummaryFunctionArgumentDescription("Count", ScaleType.Numerical)},

Now, you can assign the registered function to the series's SummaryFunction property.

See Also