ChartContext Class

Provides a connection between data item containers from the Values section and series from an underlying control.

Namespace: DevExpress.DashboardCommon

Assembly: DevExpress.Dashboard.v20.2.Core.dll

NuGet Packages: DevExpress.Dashboard.Core, DevExpress.WindowsDesktop.Dashboard.Core

Declaration

C#

public class ChartContext :
    ControlContext

VB.NET

Public Class ChartContext
    Inherits ControlContext

Related API Members

The following members return ChartContext objects:

• CustomExportEventArgs.GetChartContext(String)
• CustomExportWebEventArgs.GetChartContext(String)
• DashboardItemControlEventArgs.ChartContext

Remarks

A chart context provides the connection between dashboard data item containers from the Values section and the underlying control’s series. The GetControlSeries method returns a data item container that corresponds to the specified control’s series. The GetDashboardItemColumn method, in turn, gets a collection of the control’s series that corresponds to the specified data item containers from the Values section.

The following code shows how to change the standard line to a line consisting of a repeating pattern of dash-dot. The Chart contains two panes with Total Sum and Quantity data items. The series contains two values. The DashboardDesigner.DashboardItemControlUpdated event is used to update the Chart’s appearance.

C#

using DevExpress.DashboardCommon;
using DevExpress.DashboardWin;
using DevExpress.XtraCharts;

// ...

private void DashboardDesigner1_DashboardItemControlUpdated(object sender, DashboardItemControlEventArgs e) {
    if(e.ChartControl != null) {
        DashboardDesigner designer = (DashboardDesigner)sender;
        var chartDashboardItem = designer.Dashboard.Items[e.DashboardItemName] as ChartDashboardItem;

        foreach(var pane in chartDashboardItem.Panes) {
            if(pane.Series.Count > 0) {
                foreach(var dashSeries in pane.Series) {
                    if(dashSeries != null) {
                        var controlSeries = e.ChartContext.GetChartSeries(dashSeries);
                        if(controlSeries != null) {
                            foreach(var ser in controlSeries) {
                                LineSeriesView view = ser.View as LineSeriesView;
                                if(view != null) {
                                    view.LineStyle.DashStyle = DashStyle.DashDot;
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}

VB.NET

Imports DevExpress.DashboardCommon
Imports DevExpress.DashboardWin
Imports DevExpress.XtraCharts

' ...

Private Sub DashboardDesigner1_DashboardItemControlUpdated(ByVal sender As Object, ByVal e As DashboardItemControlEventArgs)

Private Sub DashboardDesigner1_DashboardItemControlUpdated(ByVal sender As Object, ByVal e As DashboardItemControlEventArgs)
    If e.ChartControl IsNot Nothing Then
        Dim designer As DashboardDesigner = CType(sender, DashboardDesigner)
        Dim chartDashboardItem = TryCast(designer.Dashboard.Items(e.DashboardItemName), ChartDashboardItem)

        For Each pane In chartDashboardItem.Panes
            If pane.Series.Count > 0 Then
                For Each dashSeries In pane.Series
                    If dashSeries IsNot Nothing Then
                        Dim controlSeries = e.ChartContext.GetChartSeries(dashSeries)
                        If controlSeries IsNot Nothing Then
                            For Each ser In controlSeries
                                Dim view As LineSeriesView = TryCast(ser.View, LineSeriesView)
                                If view IsNot Nothing Then
                                    view.LineStyle.DashStyle = DashStyle.DashDot
                                End If
                            Next ser
                        End If
                    End If
                Next dashSeries
            End If
        Next pane
    End If
End Sub

Inheritance

Object

ControlContext

ChartContext