TreeViewItem.Collapsed Event

Definition

Namespace:

System.Windows.Controls

Assembly:

PresentationFramework.dll

Occurs when the IsExpanded property changes from true to false.

C#

public event System.Windows.RoutedEventHandler Collapsed;

Event Type

RoutedEventHandler

Examples

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

XAML

<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>

C#

private void OnCollapsed(object sender, RoutedEventArgs e)
{
    //Perform actions when the TreeViewItem is collapsed
}

Remarks

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

Routed Event Information

Item	Value
Identifier field	CollapsedEvent
Routing strategy	Bubbling
Delegate	RoutedEventHandler

Applies to

See also

• IsExpanded
• Collapsed