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
Available since 1.1
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