TreeViewItem.IsExpanded Property

Definition

Namespace:

System.Windows.Controls

Assembly:

PresentationFramework.dll

Gets or sets whether the nested items in a TreeViewItem are expanded or collapsed.

C#

public bool IsExpanded { get; set; }

Property Value

Boolean

true if the nested items of a TreeViewItem are visible; otherwise, false. The default is false.

Examples

The following example shows how to set the IsExpanded property.

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#

Employee1Data.IsExpanded = true;

Remarks

The appearance of the button that expands and collapses the TreeViewItem changes when the TreeViewItem is expanded or collapsed. When the IsExpanded property value changes from true to false, the Collapsed event occurs. Similarly, the Expanded event occurs when the IsExpanded property value changes from false to true.

Dependency Property Information

Item	Value
Identifier field	IsExpandedProperty
Metadata properties set to true	None

Applies to

See also

• Collapsed
• Expanded