[Expand]General Information
[Collapse]WinForms Controls
  .NET Core Support
 [Expand]What's Installed
 [Expand]Build an Application
 [Collapse]Controls and Libraries
  [Expand]Forms and User Controls
  [Expand]Messages, Notifications, and Dialogs
  [Expand]Editors and Simple Controls
  [Expand]Ribbon, Bars and Menu
  [Expand]Application UI Manager
  [Expand]Docking Library
  [Expand]Data Grid
  [Expand]Vertical Grid
  [Expand]Property Grid
  [Expand]Pivot Grid
  [Expand]Tree List
  [Expand]Gantt Control
  [Collapse]Chart Control
   [Expand]Getting Started
   [Expand]Charting Basics
   [Expand]Series Views
   [Expand]Chart Elements
   [Expand]Providing Data
   [Collapse]Data Representation
     Filter Series Data
     Sorting Data
     Data Aggregation
     Calculating Summaries
    [Expand]Financial Charting
     Using The Top-N Feature
     Work Time and Workday Configuration
     Empty Points
     Format Text Chart Elements
   [Expand]Appearance Customization
   [Expand]End-User Features
   [Expand]Design-Time Features
   [Expand]Visual Elements
   [Expand]Additional Resources
  [Expand]Map Control
  [Expand]Rich Text Editor
  [Expand]Spell Checker
  [Expand]Form Layout Managers
  [Expand]Navigation Controls
  [Expand]PDF Viewer
  [Expand]TreeMap Control
  [Expand]Sunburst Control
 [Expand]Common Features
  Get More Help
 [Expand]API Reference
[Expand]ASP.NET Controls and MVC Extensions
[Expand]ASP.NET Bootstrap Controls
[Expand]ASP.NET Core Bootstrap Controls
[Expand]WPF Controls
[Expand]Xamarin Controls
[Expand]Windows 10 App Controls
[Expand]Office File API
[Expand]Report and Dashboard Server
[Expand]eXpressApp Framework
[Expand]eXpress Persistent Objects
[Expand]CodeRush Classic
[Expand]Cross-Platform Core Libraries
[Expand]Tools and Utilities
 End-User Documentation
View this topic on docs.devexpress.com (Learn more)

Calculating Summaries

The chart control provides built-in and custom summary functions, which can be calculated for data-bound series on the series point values. This document describes summary functions and ways of applying them.

In addition to summary functions, the chart control can automatically aggregate data depending on its size. For more information, refer to Data Aggregation.

The document consists of the following sections.

Expanded Built-in Summary Functions

The chart control provides the following built-in summary functions:

  • minimum ("MIN"),
  • maximum ("MAX"),
  • sum ("SUM"),
  • average ("AVERAGE"),
  • count ("COUNT").

Automatic summary functions can be calculated only for those Series Views, which operate with data points with only 1 value for each. If series data points have 2 or more values (e.g., range, Gantt, Financial and Bubble series views), you should use Custom Summary Functions instead.

The summary function can't be calculated when the ScaleOptionsBase.ScaleMode is set to Continuous.

The table below demonstrates a chart that utilizes a Point series, with a summary and no summary applied to its data.

Summary function Resulting image
Without summary function
Average summary function

Note that the chart control should be aware of the specified measure unit before you apply a summary function to series data. To illustrate this behavior, consider the chart control bound to the following data table.

SeriesPoint Argument Value
[0] 1 5
[1] 1 10
[2] 2 20
[3] 2 40
[4] 3 20
[5] 3 65
[6] 5 15
[7] 6 25
[8] 7 50
[9] 8 25
[10] 9 65
[11] 10 25
[12] 10 15
[13] 20 120
[14] 20 120

The table below shows how the SUM summary function depends on the measure unit.

Property values

Resulting image

MeasureUnit = Ones

SummaryFunction = SUM

MeasureUnit = Tens

SummaryFunction = SUM

In the charts above, the measure unit is specified manually in the manual scale mode (the ScaleOptionsBase.ScaleMode property is set to Manual) using the NumericSummaryOptions.MeasureUnit (DateTimeSummaryOptions.MeasureUnit or TimeSpanSummaryOptions.MeasureUnit) property.

If you need the chart control to calculate a measure unit and apply it to the X-axis automatically depending on the chart data, select the automatic scale mode (the ScaleOptionsBase.ScaleMode property is set to Automatic). For more information, refer to Data Aggregation.


If you specify the summary function, the aggregate function (ScaleGridOptionsBase.AggregateFunction) can't be applied to data.

In addition to the built-in summary functions, you can create a custom one to calculate a summary value in any way you wish. For more details, see the Custom Summary Functions section.

Expanded Example

Consider the chart control bound to a data source. For instance, take a look at a chart from Lesson 4 (see the "Create Data Objects and Bind a ChartControl" section), which is bound to the GSP database.

Add a Point Series to the chart. Then, set the SeriesBase.ArgumentDataMember property to the Region data field, and SeriesBase.ValueDataMembers property to GSP.

This initial chart is shown below.

To calculate the AVERAGE function for the GSP data field, do the following.

  • Select the required series and in the Properties window, locate its SummaryFunction (see SummaryOptionsBase.SummaryFunction) property.
  • Click the ellipsis button to invoke the Summary Function dialog. In the invoked dialog, choose the required AVERAGE summary function and the data field to be averaged.

  • To apply the changes and quit the dialog, click OK.

The result is shown in the image below.

The following code snippet illustrates how to do the same at runtime.


You need to choose appropriate SummaryOptions (DateTimeSummaryOptions (see SeriesBase.DateTimeSummaryOptions), TimeSpanSummaryOptions (see SeriesBase.TimeSpanSummaryOptions), NumericSummaryOptions (see SeriesBase.NumericSummaryOptions) or QualitativeSummaryOptions (see SeriesBase.QualitativeSummaryOptions)) depending on the type of series point arguments.

Expanded Custom Summary Functions

The following example demonstrates how to create a custom summary function, which returns an OHLC point calculated by the passed array of values. To accomplish this task, create a SummaryFunction delegate and register it using the ChartControl.RegisterSummaryFunction method:

Expanded See Also

Is this topic helpful?​​​​​​​