ChartDataSourceAdapter.SummaryFunction Property

Specifies the summary function to aggregate data when generating chart items.

Namespace: DevExpress.Xpf.Map

Assembly: DevExpress.Xpf.Map.v18.2.dll

Declaration

C#

public SummaryFunction SummaryFunction { get; set; }

VB.NET

Public Property SummaryFunction As SummaryFunction

Property Value

Type	Description
SummaryFunction	A SummaryFunction object.

Available values:

Name	Description
Average	The average value is calculated.
Count	The total count value is calculated.
Max	The maximum value is calculated.
Min	The minimum value is calculated.
Sum	The total summary value is calculated.

Example

The ChartDataSourceAdapter class contains the following parameters that can be customized.

• ChartDataSourceAdapter.ItemMinSize - allows specifying an items’ minimum size;
• ChartDataSourceAdapter.ItemMaxSize - allows specifying an items’ maximum size;
• ChartDataSourceAdapter.MeasureRules - allows specifying measure rules used to calculate the size of chart items;
• ChartDataSourceAdapter.SummaryFunction - allows specifying the type of a summary function used to estimate the value of chart items.

Note

A complete sample project is available at https://github.com/DevExpress-Examples/how-to-customize-chart-data-source-adapter-parameters-t209508.

MainWindow.xaml

<Window
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:sys="clr-namespace:System;assembly=mscorlib"
        xmlns:dxm="http://schemas.devexpress.com/winfx/2008/xaml/map"
        x:Class="BubbleChartDataAdapter.MainWindow"
        Title="MainWindow" Height="480" Width="640">
    <Window.Resources>
        <ObjectDataProvider x:Key="SummaryFunctions"
                            ObjectType="{x:Type sys:Enum}" MethodName="GetValues">
            <ObjectDataProvider.MethodParameters>
                <x:Type TypeName="dxm:SummaryFunction"/>
            </ObjectDataProvider.MethodParameters>
        </ObjectDataProvider>
        <XmlDataProvider x:Key="dataSet" Source="SummaryExample.xml" XPath="/dataSet" />
    </Window.Resources>

    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="3*"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>
        <dxm:MapControl Grid.Column="0">
            <dxm:VectorLayer ToolTipEnabled="True" 
                             ToolTipPattern="Summary Function Result: %V%">
                <dxm:BubbleChartDataAdapter 
                    x:Name="adapter" ItemMinSize="10" ItemMaxSize="60" 
                    DataSource="{Binding Source={StaticResource dataSet}, XPath=data}"
                    SummaryFunction="{Binding ElementName=lbSummaryFunction, Path=SelectedValue}" ItemIdDataMember="id">
                    <dxm:BubbleChartDataAdapter.Mappings>
                        <dxm:MapBubbleMappingInfo Latitude="lat" Longitude="lon" Value="value"/>
                    </dxm:BubbleChartDataAdapter.Mappings>
                    <dxm:BubbleChartDataAdapter.MeasureRules>
                        <dxm:MeasureRules RangeStops="1 2 3 4 5 6 7 8 9 10"/>
                    </dxm:BubbleChartDataAdapter.MeasureRules>
                </dxm:BubbleChartDataAdapter>
            </dxm:VectorLayer>            
        </dxm:MapControl>
        <StackPanel Grid.Column="1" >
            <Label>Summary Function:</Label>
        <ListBox x:Name="lbSummaryFunction" Margin="4"  SelectedIndex="0"
                 ItemsSource="{Binding Source={StaticResource SummaryFunctions}}"/>
        </StackPanel>
    </Grid>
</Window>

Related GitHub Examples

The following code snippet (auto-collected from DevExpress Examples) contains a reference to the SummaryFunction property.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

C#

how-to-customize-chart-data-source-adapter-parameters-t209508/VB/BubbleChartDataAdapter/MainWindow.xaml#L29

DataSource="{Binding Source={StaticResource dataSet}, XPath=data}"
SummaryFunction="{Binding ElementName=lbSummaryFunction, Path=SelectedValue}" ItemIdDataMember="id">
<dxm:BubbleChartDataAdapter.Mappings>