DashboardViewer.DataLoading Event

Allows you to provide data for the DashboardObjectDataSource.

Namespace: DevExpress.DashboardWin

Assembly: DevExpress.Dashboard.v24.2.Win.dll

Declaration

C#

public event DataLoadingEventHandler DataLoading

VB.NET

Public Event DataLoading As DataLoadingEventHandler

Event Data

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

Property	Description
Data	Gets or sets data for the current data source.
DataId	Gets an object data source’s unique identifier.
DataSourceComponentName	Get the component name of the data source for which the event has been raised.
DataSourceName	Gets the name of the data source for which the event has been raised.
OverwriteDataSourceProperty	Specifies whether the DataSource and DataMember properties of the DashboardObjectDataSource are set when data is supplied in the event handler.
Parameters	Provides access to parameter values passed to the object data source.

Remarks

The DataLoading event is raised when the dashboard needs to load data from a data source assigned using the DashboardObjectDataSource. Use the event parameter’s DataLoadingEventArgs.Data property to provide data for this data source. This object should implement the IEnumerable or IListSource interface.

For other data source types (for instance, DashboardSqlDataSource or DashboardOlapDataSource), you can handle the DashboardViewer.ConfigureDataConnection event to customize connection parameters.

Example

The following example demonstrates how to bind a dashboard to a List object.

The quantity values are provided at runtime. The dashboard data source is added to the Dashboard.DataSources collection on the first load.

Click the Reload Data button to call the DashboardViewer.ReloadData method. It raises the DashboardViewer.DataLoading event and supplies the dashboard with updated data.

View Example: How to Bind a Dashboard to a List of Objects

Data.cs

using System;
using System.Collections.Generic;
using System.Threading;

namespace Dashboard_BindingToList {
    public class Data {
        public string SalesPerson { get; set; }
        public int Quantity { get; set; }

        public static List<Data> CreateData() {
            List<Data> data = new List<Data>();
            string[] salesPersons = { "Andrew Fuller", "Michael Suyama", "Robert King", "Nancy Davolio",
                "Margaret Peacock", "Laura Callahan", "Steven Buchanan", "Janet Leverling" };

            for (int i = 0; i < 100; i++) {
                Data record = new Data();
                int seed = (int)DateTime.Now.Ticks & 0x0000FFFF;
                record.SalesPerson = salesPersons[new Random(seed).Next(0, salesPersons.Length)];
                record.Quantity = new Random(seed).Next(0, 100);
                data.Add(record);
                Thread.Sleep(3);
            }
            return data;
        }
    }
}

Form1.cs

using DevExpress.DashboardCommon;
using DevExpress.DashboardWin;
using DevExpress.DataAccess;
using DevExpress.XtraEditors;
using System;

namespace Dashboard_BindingToList {
    public partial class Form1 : XtraForm {
        public Form1() {
            InitializeComponent();
            dashboardViewer1.DataSourceOptions.ObjectDataSourceLoadingBehavior = DocumentLoadingBehavior.LoadAsIs;
            dashboardViewer1.CustomizeDashboardTitle += DashboardViewer1_CustomizeDashboardTitle;
        }

        private void Form1_Load(object sender, System.EventArgs e) {
            Dashboard dashboard = new Dashboard();

            DashboardObjectDataSource dataSource = new DashboardObjectDataSource("Data Source 1");
            dashboardViewer1.DataLoading += (s, ev) => {
                if (ev.DataSourceName == "Data Source 1")
                    ev.Data = Data.CreateData();
            };
            dashboard.DataSources.Add(dataSource);

            PieDashboardItem pies = new PieDashboardItem();
            pies.DataSource = dashboard.DataSources[0];
            Dimension salesPersonArgument = new Dimension("SalesPerson");
            Measure quantity = new Measure("Quantity");
            pies.Arguments.Add(salesPersonArgument);
            salesPersonArgument.TopNOptions.Enabled = true; salesPersonArgument.TopNOptions.Count = 3;
            salesPersonArgument.TopNOptions.Measure = quantity;
            pies.Values.Add(quantity);

            GridDashboardItem grid = new GridDashboardItem();
            grid.DataSource = dashboard.DataSources[0];
            grid.Columns.Add(new GridDimensionColumn(new Dimension("SalesPerson")));
            grid.Columns.Add(new GridMeasureColumn(new Measure("Quantity")));

            dashboard.Items.AddRange(pies, grid);
            dashboardViewer1.Dashboard = dashboard;

        }

        private void DashboardViewer1_CustomizeDashboardTitle(object sender, CustomizeDashboardTitleEventArgs e)
        {
            DashboardToolbarItem titleButton = new DashboardToolbarItem("Load Data",
                new Action<DashboardToolbarItemClickEventArgs>((args) =>
                {
                    dashboardViewer1.ReloadData();
                }));
            titleButton.Caption = "Reload Data";
            e.Items.Add(titleButton);
        }
    }
}

Data.vb

Imports System
Imports System.Collections.Generic
Imports System.Threading

Namespace Dashboard_BindingToList
    Public Class Data
        Public Property SalesPerson() As String
        Public Property Quantity() As Integer

        Public Shared Function CreateData() As List(Of Data)
'INSTANT VB NOTE: The variable data was renamed since it may cause conflicts with calls to static members of the user-defined type with this name:
            Dim data_Renamed As New List(Of Data)()
            Dim salesPersons() As String = { "Andrew Fuller", "Michael Suyama", "Robert King", "Nancy Davolio", "Margaret Peacock", "Laura Callahan", "Steven Buchanan", "Janet Leverling" }

            For i As Integer = 0 To 99
                Dim record As New Data()
                Dim seed As Integer = CInt(Date.Now.Ticks And &HFFFF)
                record.SalesPerson = salesPersons((New Random(seed)).Next(0, salesPersons.Length))
                record.Quantity = (New Random(seed)).Next(0, 100)
                data_Renamed.Add(record)
                Thread.Sleep(3)
            Next i
            Return data_Renamed
        End Function
    End Class
End Namespace

Form1.vb

Imports DevExpress.DashboardCommon
Imports DevExpress.DashboardWin
Imports DevExpress.DataAccess
Imports DevExpress.XtraEditors
Imports System

Namespace Dashboard_BindingToList
    Partial Public Class Form1
        Inherits XtraForm

        Public Sub New()
            InitializeComponent()
            dashboardViewer1.DataSourceOptions.ObjectDataSourceLoadingBehavior = DocumentLoadingBehavior.LoadAsIs
            AddHandler dashboardViewer1.CustomizeDashboardTitle, AddressOf DashboardViewer1_CustomizeDashboardTitle
        End Sub

        Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
            Dim dashboard As New Dashboard()

            Dim dataSource As New DashboardObjectDataSource("Data Source 1")
            AddHandler dashboardViewer1.DataLoading, Sub(s, ev)
                If ev.DataSourceName = "Data Source 1" Then
                    ev.Data = Data.CreateData()
                End If
            End Sub
            dashboard.DataSources.Add(dataSource)

            Dim pies As New PieDashboardItem()
            pies.DataSource = dashboard.DataSources(0)
            Dim salesPersonArgument As New Dimension("SalesPerson")
            Dim quantity As New Measure("Quantity")
            pies.Arguments.Add(salesPersonArgument)
            salesPersonArgument.TopNOptions.Enabled = True
            salesPersonArgument.TopNOptions.Count = 3
            salesPersonArgument.TopNOptions.Measure = quantity
            pies.Values.Add(quantity)

            Dim grid As New GridDashboardItem()
            grid.DataSource = dashboard.DataSources(0)
            grid.Columns.Add(New GridDimensionColumn(New Dimension("SalesPerson")))
            grid.Columns.Add(New GridMeasureColumn(New Measure("Quantity")))

            dashboard.Items.AddRange(pies, grid)
            dashboardViewer1.Dashboard = dashboard

        End Sub

        Private Sub DashboardViewer1_CustomizeDashboardTitle(ByVal sender As Object, ByVal e As CustomizeDashboardTitleEventArgs)
            Dim titleButton As DashboardToolbarItem = New DashboardToolbarItem("Load Data", New Action(Of DashboardToolbarItemClickEventArgs)(Sub(args)
                dashboardViewer1.ReloadData()
            End Sub))
            titleButton.Caption = "Reload Data"
            e.Items.Add(titleButton)
        End Sub
    End Class
End Namespace

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the DataLoading event.

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#

winforms-dashboard-designer-bind-a-dashboard-to-a-list-object/CS/Dashboard_BindingToList/Form1.cs#L19

DashboardObjectDataSource dataSource = new DashboardObjectDataSource("Data Source 1");
dashboardViewer1.DataLoading += (s, ev) => {
    if (ev.DataSourceName == "Data Source 1")

winforms-dashboard-add-custom-interactivity-to-dashboard/CS/Dashboard_CustomVisualInteractivity/Form1.cs#L13

InitializeComponent();
dashboardViewer1.DataLoading += dashboardViewer1_DataLoading;
dashboardViewer1.DashboardItemClick += dashboardViewer1_DashboardItemClick;

winforms-dashboard-bind-a-dashboard-to-a-dataset-populated-from-an-xml-file/CS/Dashboard_DataLoading_Example/Form1.cs#L16

    dashboardViewer1.Dashboard = new Dashboard1();
    dashboardViewer1.DataLoading += DashboardViewer1_DataLoading;
}

VB.NET

winforms-dashboard-designer-bind-a-dashboard-to-a-list-object/VB/Dashboard_BindingToList/Form1.vb#L21

Dim dataSource As New DashboardObjectDataSource("Data Source 1")
AddHandler dashboardViewer1.DataLoading, Sub(s, ev)
    If ev.DataSourceName = "Data Source 1" Then

winforms-dashboard-add-custom-interactivity-to-dashboard/VB/Dashboard_CustomVisualInteractivity/Form1.vb#L14

InitializeComponent()
AddHandler dashboardViewer1.DataLoading, AddressOf dashboardViewer1_DataLoading
AddHandler dashboardViewer1.DashboardItemClick, AddressOf dashboardViewer1_DashboardItemClick

winforms-dashboard-bind-a-dashboard-to-a-dataset-populated-from-an-xml-file/VB/Dashboard_DataLoading_Example/Form1.vb#L16

    dashboardViewer1.Dashboard = New Dashboard1()
    AddHandler dashboardViewer1.DataLoading, AddressOf DashboardViewer1_DataLoading
End Sub

Implements

DataLoading