ValueDataMemberCollection Class

Stores objects that specify data source fields that contain data for series point values.

Namespace: DevExpress.XamarinForms.Charts

Assembly: DevExpress.XamarinForms.Charts.dll

NuGet Package: DevExpress.XamarinForms.Charts

Declaration

public class ValueDataMemberCollection :
    ObservableCollection<ValueDataMember>

The following members return ValueDataMemberCollection objects:

Remarks

ValueDataMemberCollection is a collection of ValueDataMember objects, which provide data for series point values. The number of these objects within the collection depends on the series type.

Example

These examples show how to create and configure the data adapter to populate ChartView series of different types with data.

For most series types supported by ChartView (besides financial, range bar and bubble charts), specify one ValueDataMember object with the Type set to Value:

XAML

<dxc:ChartView>
  <dxc:ChartView.Series>
    <dxc:LineSeries>
      <dxc:LineSeries.Data>
        <dxc:SeriesDataAdapter DataSource="{Binding GdpValues}" ArgumentDataMember="Year">
          <dxc:SeriesDataAdapter.ValueDataMembers>
            <dxc:ValueDataMember Type="Value" Member="Value"/>
          </dxc:SeriesDataAdapter.ValueDataMembers>
        </dxc:SeriesDataAdapter>
      </dxc:LineSeries.Data>
    </dxc:LineSeries>
  </dxc:ChartView.Series>
</dxc:ChartView>

Note

ValueDataMembers is a content property. You can skip property tags in the markup.

For financial series (CandleStickSeries and StockSeries), specify four ValueDataMember objects with Type set to High, Low, Open, and Close:

XAML

<dxc:ChartView>
  <dxc:ChartView.Series>
    <dxc:CandleStickSeries>
      <dxc:CandleStickSeries.Data>
        <dxc:SeriesDataAdapter DataSource="{Binding StockPrices}" ArgumentDataMember="Date">
            <dxc:ValueDataMember Type="High" Member="HighValue" />
            <dxc:ValueDataMember Type="Low" Member="LowValue" />
            <dxc:ValueDataMember Type="Open" Member="OpenValue" />
            <dxc:ValueDataMember Type="Close" Member="CloseValue" />
        </dxc:SeriesDataAdapter>
      </dxc:CandleStickSeries.Data>
    </dxc:CandleStickSeries>
  </dxc:ChartView.Series>
</dxc:ChartView>

For RangeBarSeries, specify two ValueDataMember objects with Type set to High and Low:

XAML

<dxc:ChartView>
    <dxc:ChartView.Series>
        <dxc:RangeBarSeries>
            <dxc:RangeBarSeries.Data>
                <dxc:SeriesDataAdapter DataSource="{Binding OilPrices}" ArgumentDataMember="Month">
                    <dxc:ValueDataMember Type="High" Member="HighValue" />
                    <dxc:ValueDataMember Type="Low" Member="LowValue" />
                </dxc:SeriesDataAdapter>
            </dxc:RangeBarSeries.Data>
        </dxc:RangeBarSeries>
    </dxc:ChartView.Series>
</dxc:ChartView>

For BubbleSeries, specify two ValueDataMember objects with Type set to Value and Weight:

XAML

<dxc:ChartView>
  <dxc:ChartView.Series>
    <dxc:BubbleSeries>
      <dxc:BubbleSeries.Data>
        <dxc:SeriesDataAdapter DataSource="{Binding HighestGrossingFilms}" ArgumentDataMember="Date">
            <dxc:ValueDataMember Type="Value" Member="Value" />
            <dxc:ValueDataMember Type="Weight" Member="WorldwideGrosses" />
        </dxc:SeriesDataAdapter>
      </dxc:BubbleSeries.Data>
    </dxc:BubbleSeries>
  </dxc:ChartView.Series>
</dxc:ChartView>