Collapsed Event
Collapse the table of content
Expand the table of content

TreeViewItem.Collapsed Event

 

Occurs when the IsExpanded property changes from true to false.

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

public event RoutedEventHandler Collapsed

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

.NET Framework
Available since 3.0
Silverlight
Available since 3.0
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