wpf-devexpress-dot-xpf-dot-grid-dot-treelist-a95838b9.md
Stores data for the AutomationRequested attached event when the target tree node is focused.
Namespace : DevExpress.Xpf.Grid.TreeList
Assembly : DevExpress.Xpf.Grid.v25.2.dll
NuGet Package : DevExpress.Wpf.Grid.Core
public class TreeListNodeAutomationEventArgs :
AutomationEventArgs
Public Class TreeListNodeAutomationEventArgs
Inherits AutomationEventArgs
Use the TreeListNodeAutomationEventArgs class to read or modify values announced by screen readers when the target tree list node is focused.
The AutomationRequested attached event allows you to change default values announced by third-party screen readers. The event fires for a tree list node when a TreeListControl (or a related control) requests a UI automation value for a focused node.
The following code example handles the AutomationRequested event and changes values announced by a screen reader when the target node is focused:
<dxg:TreeListControl ItemsSource="{Binding Categories}">
<dxg:TreeListControl.View>
<dxg:TreeListView
dxg:GridAutomationHelper.AutomationRequested="OnAutomationRequested"/>
</dxg:TreeListControl.View>
</dxg:TreeListControl>
using DevExpress.Xpf.Grid.TreeList;
using DevExpress.Xpf.Grid.Automation;
void OnAutomationRequested(object sender, AutomationEventArgs e) {
if (e is TreeListNodeAutomationEventArgs args) {
// Example: use a property from the bound data object
if (args.Row is Category item && !string.IsNullOrEmpty(item.Title)) {
e.AutomationValue = $"Category {item.Title}";
}
}
}
Object EventArgs RoutedEventArgs AutomationEventArgs TreeListNodeAutomationEventArgs
See Also