This documentation is archived and is not being maintained.

TreeNode.IsExpanded Property

Gets a value indicating whether the tree node is in the expanded state.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public bool IsExpanded { get; }

Property Value

Type: System.Boolean
true if the tree node is in the expanded state; otherwise, false.

The following code example toggles the selected node when a button is clicked. If the selected node is collapsed, it is expanded, if it is expanded by calling the Expand method, it is collapsed by calling the Collapse method. This example requires that you have a Form with a TreeView control that has at least one TreeNode with at least one child TreeNode.

private void button1_Click(object sender, System.EventArgs e)
   if (treeView1.SelectedNode.IsExpanded)
      MessageBox.Show(treeView1.SelectedNode.Text + 
        " tree node collapsed.");
      MessageBox.Show(treeView1.SelectedNode.Text + 
        " tree node expanded.");

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.