dashboard-devexpress-dot-dashboardwin-dot-dashboardviewer-c2f45983.md
Allows you to provide data for the DashboardObjectDataSource in asynchronous mode.
Namespace : DevExpress.DashboardWin
Assembly : DevExpress.Dashboard.v25.2.Win.dll
NuGet Package : DevExpress.Win.Dashboard
public event DataLoadingEventHandler AsyncDataLoading
Public Event AsyncDataLoading As DataLoadingEventHandler
The AsyncDataLoading 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. |
The AsyncDataLoading event is raised in asynchronous mode when the dashboard loads data from the DashboardObjectDataSource. Use the event parameter’s e.Data property to provide data for this data source. The data object should implement the IEnumerable or IListSource interface.
Note
You cannot access a control’s properties such as the DashboardControl.Dashboard property through the AsyncDataLoading event because it receives data asynchronously from a background thread.
The following code snippets (auto-collected from DevExpress Examples) contain references to the AsyncDataLoading 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.
InitializeComponent();
dashboardViewer1.AsyncDataLoading += OnDashboardViewerAsyncDataLoading;
dashboardViewer1.DataSourceOptions.ObjectDataSourceLoadingBehavior = DevExpress.DataAccess.DocumentLoadingBehavior.LoadAsIs;
winviewer-how-to-create-custom-card-layout-template/CS/ViewerForm.cs#L22
DashboardObjectDataSource dataSource = new DashboardObjectDataSource();
dashboardViewer1.AsyncDataLoading += (s, ev) => {
ev.Data = DataGenerator.GenerateTestData();
InitializeComponent()
AddHandler dashboardViewer1.AsyncDataLoading, AddressOf OnDashboardViewerAsyncDataLoading
dashboardViewer1.DataSourceOptions.ObjectDataSourceLoadingBehavior = DevExpress.DataAccess.DocumentLoadingBehavior.LoadAsIs
winviewer-how-to-create-custom-card-layout-template/VB/ViewerForm.vb#L18
Dim dataSource As New DashboardObjectDataSource()
AddHandler dashboardViewer1.AsyncDataLoading, Sub(s, ev)
ev.Data = DataGenerator.GenerateTestData()
See Also