DataMemberSummaryFunction Class

The base class for summary functions that aggregate values that the specified data source member provides.

Namespace: DevExpress.Xpf.Charts

Assembly: DevExpress.Xpf.Charts.v19.2.dll

Declaration

public abstract class DataMemberSummaryFunction :
    SummaryFunctionBase
Public MustInherit Class DataMemberSummaryFunction
    Inherits SummaryFunctionBase

Remarks

Use the DataMemberSummaryFunction.ValueDataMember property to specify the data member that provides values to be aggregated.

Examples

The example demonstrates how to apply AverageSummaryFunction to aggregate data points.

Use the following API members to configure the summary function options:

Member Description
Series.Summary Gets or sets the series data point summarization settings.
Summary Stores the series data point summarize options.
Summary.Function Specifies the summary function that calculates data point values.
AverageSummaryFunction The summary function that calculates the average of data point values.
DataMemberSummaryFunction.ValueDataMember Gets or sets the data source field that provides data to be aggregated.
<Window.DataContext>
    <local:ChartViewModel/>
</Window.DataContext>
<Grid>
    <dxc:ChartControl>
        <dxc:XYDiagram2D SeriesItemsSource="{Binding SaleSeries}">
            <dxc:XYDiagram2D.SeriesItemTemplate>
                <DataTemplate>
                    <dxc:PointSeries2D DataSource="{Binding Values}"
                                       ArgumentDataMember="Category"
                                       ValueDataMember="Value">
                        <!-- Configure the summary function options. -->
                        <dxc:PointSeries2D.Summary>
                            <dxc:Summary>
                                <dxc:Summary.Function>
                                    <dxc:AverageSummaryFunction ValueDataMember="Value"/>
                                </dxc:Summary.Function>
                            </dxc:Summary>
                        </dxc:PointSeries2D.Summary>
                        <!--...-->
                        <dxc:PointSeries2D.Label>
                            <dxc:SeriesLabel Visible="True" TextPattern="Average: ${V}M" 
                                             dxc:MarkerSeries2D.Angle="90" ResolveOverlappingMode="JustifyAroundPoint"/>
                        </dxc:PointSeries2D.Label>
                    </dxc:PointSeries2D>
                </DataTemplate>
            </dxc:XYDiagram2D.SeriesItemTemplate>
            <dxc:XYDiagram2D.AxisX>
                <dxc:AxisX2D TickmarksMinorVisible="False"/>
            </dxc:XYDiagram2D.AxisX>
            <dxc:XYDiagram2D.AxisY>
                <dxc:AxisY2D Interlaced="False">
                    <dxc:AxisY2D.WholeRange>
                        <dxc:Range dxc:AxisY2D.AlwaysShowZeroLevel="False"/>
                    </dxc:AxisY2D.WholeRange>
                    <dxc:AxisY2D.Label>
                        <dxc:AxisLabel TextPattern="${V}M"/>
                    </dxc:AxisY2D.Label>
                </dxc:AxisY2D>
            </dxc:XYDiagram2D.AxisY>
        </dxc:XYDiagram2D>
        <dxc:ChartControl.Titles>
            <dxc:Title Content="Product Sales" HorizontalAlignment="Center" FontSize="14"/>
        </dxc:ChartControl.Titles>
    </dxc:ChartControl>
</Grid>

Inheritance

Object
DevExpress.Xpf.Charts.NotifyPropertyChangedObject
See Also