DashboardViewer.DashboardItemBeforeControlDisposed Event

Allows you to access underlying WinForms controls.

Namespace: DevExpress.DashboardWin

Assembly: DevExpress.Dashboard.v24.1.Win.dll

NuGet Package: DevExpress.Win.Dashboard

Declaration

C#

public event DashboardItemBeforeControlDisposedEventHandler DashboardItemBeforeControlDisposed

VB.NET

Public Event DashboardItemBeforeControlDisposed As DashboardItemBeforeControlDisposedEventHandler

Event Data

The DashboardItemBeforeControlDisposed event's data class is DashboardItemControlEventArgs. The following properties provide information specific to this event:

Property	Description
CardControl	Gets an underlying Card control.
ChartContext	Gets the chart context.
ChartControl	Gets an underlying chart control.
DashboardItemName	Gets the component name of the dashboard item for which the event was raised.
DateFilterControl	Gets an underlying date filter control.
GaugeContext	Gets the gauge context.
GaugeControl	Gets an underlying gauge control.
GridContext	Gets the grid context.
GridControl	Gets an underlying grid control.
MapControl	Gets an underlying map control.
PictureEdit	Gets an underlying picture edit control.
PivotGridControl	Gets an underlying PivotGridControl.
RichEditControl	Gets an underlying RichEdit control.
TreeMapControl	Gets an underlying TreeMap control.

Remarks

The WinForms Viewer uses DevExpress WinForms controls to visualize data within dashboard items. The DashboardViewer.DashboardItemControlUpdated event allows you to access these controls and customize their settings if necessary.

The DashboardItemControlEventArgs.DashboardItemName property returns the component name of the dashboard item to be customized. Use the following properties to access the corresponding underlying controls.

Dashboard Item	Control	Property
GridDashboardItem	GridControl	DashboardItemControlEventArgs.GridControl
ChartDashboardItem PieDashboardItem ScatterChartDashboardItem	ChartControl	DashboardItemControlEventArgs.ChartControl
GaugeDashboardItem	GaugeControl	DashboardItemControlEventArgs.GaugeControl
CardDashboardItem	CardControl	DashboardItemControlEventArgs.CardControl
PivotDashboardItem	PivotGridControl	DashboardItemControlEventArgs.PivotGridControl
MapDashboardItem	MapControl	DashboardItemControlEventArgs.MapControl
TreemapDashboardItem	TreeMapControl	DashboardItemControlEventArgs.TreeMapControl
TextBoxDashboardItem	RichEditControl	DashboardItemControlEventArgs.RichEditControl
ImageDashboardItem	PictureEdit	DashboardItemControlEventArgs.PictureEdit
DateFilterDashboardItem	DateFilterControl	DashboardItemControlEventArgs.DateFilterControl

You can change the control setting or handle its events. To subscribe/unsubscribe from control events, use the DashboardViewer.DashboardItemControlCreated/DashboardItemBeforeControlDisposed events, respectively.

To learn more, see Access to Underlying Controls.

Example

The following example demonstrates how to customize controls used to visualize data within dashboard items at runtime using DashboardViewer‘s API.

In this example, the following options are changed:

• The font of data rows’ text is changed in the underlying grid control in the DashboardViewer.DashboardItemControlUpdated event handler.
• The background color of the chart’s pane is changed in the DashboardViewer.DashboardItemControlUpdated event handler.
• Values of data cells in the underlying pivot grid control are customized using the PivotGridControl.CustomCellValue event. Subscription and unsubscription to/from the CustomCellValue event are performed in the DashboardViewer.DashboardItemControlCreated and DashboardViewer.DashboardItemBeforeControlDisposed event handlers respectively.

View Example

Form1.vb

Imports System.Drawing
Imports DevExpress.XtraEditors
Imports DevExpress.DashboardWin
Imports DevExpress.XtraGrid.Views.Grid
Imports DevExpress.XtraCharts
Imports DevExpress.XtraPivotGrid

Namespace Dashboard_ControlAccess
    Partial Public Class Form1
        Inherits XtraForm

        Public Sub New()
            InitializeComponent()
            dashboardViewer1.LoadDashboard("..\..\Data\Dashboard.xml")
        End Sub

        Private Sub dashboardViewer1_DashboardItemControlCreated(ByVal sender As Object, ByVal e As DashboardItemControlEventArgs) Handles dashboardViewer1.DashboardItemControlCreated
            If e.DashboardItemName = "pivotDashboardItem1" Then
                Dim pivotGridControl As PivotGridControl = e.PivotGridControl
                AddHandler pivotGridControl.CustomCellValue, AddressOf pivotGridControl_CustomCellValue
            End If
        End Sub

        Private Sub pivotGridControl_CustomCellValue(ByVal sender As Object, ByVal e As PivotCellValueEventArgs)
            If e.Value IsNot Nothing AndAlso DirectCast(e.Value, Decimal) < 2000 Then
                e.Value = "Too low to show"
            End If
        End Sub

        Private Sub dashboardViewer1_DashboardItemControlUpdated(ByVal sender As Object, ByVal e As DashboardItemControlEventArgs) Handles dashboardViewer1.DashboardItemControlUpdated
            If e.DashboardItemName = "gridDashboardItem1" Then
                Dim gridView As GridView = TryCast(e.GridControl.MainView, GridView)
                gridView.Appearance.Row.Font = New Font("Segoe Script", 10)
            End If
            If e.DashboardItemName = "chartDashboardItem1" Then
                Dim chartControl As ChartControl = e.ChartControl
                CType(chartControl.Diagram, XYDiagram).Panes(0).BackColor = Color.Orange
            End If
        End Sub

        Private Sub dashboardViewer1_DashboardItemBeforeControlDisposed(ByVal sender As Object, ByVal e As DashboardItemControlEventArgs) Handles dashboardViewer1.DashboardItemBeforeControlDisposed
            If e.DashboardItemName = "pivotDashboardItem1" Then
                Dim pivotGridControl As PivotGridControl = e.PivotGridControl
                RemoveHandler pivotGridControl.CustomCellValue, AddressOf pivotGridControl_CustomCellValue
            End If
        End Sub
    End Class
End Namespace

Form1.cs

using System.Drawing;
using DevExpress.XtraEditors;
using DevExpress.DashboardWin;
using DevExpress.XtraGrid.Views.Grid;
using DevExpress.XtraCharts;
using DevExpress.XtraPivotGrid;

namespace Dashboard_ControlAccess {
    public partial class Form1 : XtraForm {
        public Form1() {
            InitializeComponent();
            dashboardViewer1.LoadDashboard(@"..\..\Data\Dashboard.xml");
        }

        private void dashboardViewer1_DashboardItemControlCreated(object sender, 
            DashboardItemControlEventArgs e) {
            if (e.DashboardItemName == "pivotDashboardItem1") {
                PivotGridControl pivotGridControl = e.PivotGridControl;
                pivotGridControl.CustomCellValue += pivotGridControl_CustomCellValue;
            }
        }

        void pivotGridControl_CustomCellValue(object sender, PivotCellValueEventArgs e) {
            if (e.Value != null && (decimal)e.Value < 2000)
                e.Value = "Too low to show";
        }

        private void dashboardViewer1_DashboardItemControlUpdated(object sender, 
            DashboardItemControlEventArgs e) {
            if (e.DashboardItemName == "gridDashboardItem1") {
                GridView gridView = e.GridControl.MainView as GridView;
                gridView.Appearance.Row.Font = new Font("Segoe Script", 10);
            }
            if (e.DashboardItemName == "chartDashboardItem1") {
                ChartControl chartControl = e.ChartControl;                
                ((XYDiagram)chartControl.Diagram).Panes[0].BackColor = Color.Orange;
            }
        }

        private void dashboardViewer1_DashboardItemBeforeControlDisposed(object sender, 
            DashboardItemControlEventArgs e) {
            if (e.DashboardItemName == "pivotDashboardItem1") {
                PivotGridControl pivotGridControl = e.PivotGridControl;
                pivotGridControl.CustomCellValue -= pivotGridControl_CustomCellValue;
            }
        }
    }
}

Implements

DashboardItemBeforeControlDisposed