TreeViewItem.Collapsed Event

 
System_CAPS_noteNote

The .NET API Reference documentation has a new home. Visit the .NET API Browser on docs.microsoft.com to see the new experience.

Occurs when the IsExpanded property changes from true to false.

Namespace:   System.Windows.Controls
Assembly:  PresentationFramework (in PresentationFramework.dll)

Public Event Collapsed As RoutedEventHandler

This event occurs when a TreeViewItem is collapsed so that child elements are hidden.

Identifier field

CollapsedEvent

Routing strategy

Bubbling

Delegate

RoutedEventHandler

The following example shows how to assign an event handler for the Collapsed event to a TreeViewItem,and how to define the event handler.

<TreeViewItem Header="Employee1"
              Name="Employee1Data" 
              IsExpanded="True" 
              Collapsed="OnCollapsed" 
              Expanded="OnExpanded">
  <TreeViewItem Header="Work Days" 
                Name="EmployeeWorkDays"
                IsSelected="True">
    <TreeViewItem Header="Tuesday" />
    <TreeViewItem Header="Friday"/>
  </TreeViewItem>
</TreeViewItem>
<TreeViewItem Header="Employee2" 
              Name="Employee2Data">
  <TreeViewItem Header="Work Days" 
                Name="emp2WorkDays" 
                Selected="GetSchedule"
                Unselected="SetSchedule">
    <TreeViewItem Header="Monday" />
    <TreeViewItem Header="Wednesday"/>
  </TreeViewItem>
</TreeViewItem>
Private Sub OnCollapsed(ByVal sender As Object, ByVal e As RoutedEventArgs)
	'Perform actions when the TreeViewItem is collapsed
End Sub

.NET Framework
Available since 3.0
Silverlight
Available since 3.0
Return to top
Show: