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TreeViewItem.IsExpanded Property

  • Reference

Definition

Namespace:
System.Windows.Controls
Assembly:
PresentationFramework.dll

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

public:
 property bool IsExpanded { bool get(); void set(bool value); };
public bool IsExpanded { get; set; }
member this.IsExpanded : bool with get, set
Public Property IsExpanded As Boolean

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.

<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>

Employee1Data.IsExpanded = true;

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
Identifier field IsExpandedProperty
Metadata properties set to true None

Applies to

See also