ChartSelectionChangedEventArgs Class

Contains data for the SelectionChanged event.

Namespace: DevExpress.Blazor

Assembly: DevExpress.Blazor.v23.2.dll

NuGet Package: DevExpress.Blazor

Declaration

public class ChartSelectionChangedEventArgs :
    EventArgs

Related API Members

ChartSelectionChangedEventArgs is the data class for the following events:

• DxChart<T>.SelectionChanged

Example

The following example shows how to obtain an argument and value of a selected point:

Razor

@page "/"
@using System.Drawing
@using System.Diagnostics
<DxChart Data="@dataPoints"
         Width=500 Height=300
         PointSelectionMode=ChartSelectionMode.Single
         SelectionChanged="@OnSelectionChanged">
    <DxChartLineSeries ArgumentField="@((DataPoint i) => i.Arg)"
                       ValueField="@((DataPoint i) => i.Value1)"
                       Name="Series 1"
                       HoverMode=ChartContinuousSeriesHoverMode.None>
        <DxChartSeriesPoint HoverMode=ChartSeriesPointHoverMode.None
                            SelectionMode=ChartSeriesPointSelectionMode.Point />
    </DxChartLineSeries>
</DxChart>
<br/><br/>
@if (Selection != null) {
    <div id="selection-args">
        <table>
            <tr> <td>Selected Point Argument:</td><td> @Selection.Point.Argument</td> </tr>
            <tr> <td>Selected Point Value:</td><td> @Selection.Point.Value</td> </tr>
        </table>
    </div>
}
@code {
    ChartSelectionChangedEventArgs Selection { get; set; }
    private DataPoint[] dataPoints;
    protected override void OnInitialized() {
        dataPoints = GetDataPoints();
    }
    void OnSelectionChanged(ChartSelectionChangedEventArgs selectionArgs) {
        Selection = selectionArgs;
        StateHasChanged();
    }
    public class DataPoint {
        public string Arg { get; set; }
        public int Value1 { get; set; }
        public int Value2 => (int)(Value1 * 1.2);
        public double Value3 { get; set; }
    }
    public DataPoint[] GetDataPoints() {
        DataPoint[] dataPoints = new DataPoint[] {
            new DataPoint() { Arg = "I", Value1 = 26, Value3 = 23},
            new DataPoint() { Arg = "II", Value1 = 24, Value3 = 23},
            new DataPoint() { Arg = "III", Value1 = 25, Value3 = 24},
            new DataPoint() { Arg = "IV", Value1 = 27, Value3 = 29},
            new DataPoint() { Arg = "V", Value1 = 28, Value3 = 30},
        };
        return dataPoints;
    }
}

Inheritance

Object

EventArgs

ChartSelectionChangedEventArgs