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TreeView.SelectedNode Property

Gets or sets the tree node that is currently selected in the tree view control.

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

[BrowsableAttribute(false)]
public TreeNode SelectedNode { get; set; }

Property Value

Type: System.Windows.Forms.TreeNode
The TreeNode that is currently selected in the tree view control.

If no TreeNode is currently selected, the SelectedNode property is null.

When you set this property, the specified node is scrolled into view and any parent nodes are expanded so that the specified node is visible.

When the parent node or any ancestor node of the selected node is collapsed either programmatically or through user action, the collapsed node becomes the selected node.

The following code example sets the PathSeparator property of a TreeView and displays the number of child tree nodes contained in the TreeNodeCollection of the SelectedNode. The percentage of child tree node to total tree nodes in the tree view control is also displayed. This example requires that you have a Form with a Button, and a TreeView control with a TreeNodeCollection that has several TreeNode objects (preferably with three or more levels).

private void myButton_Click(object sender, System.EventArgs e)
{
   // Set the tree view's PathSeparator property.
   myTreeView.PathSeparator = ".";

   // Get the count of the child tree nodes contained in the SelectedNode. 
   int myNodeCount = myTreeView.SelectedNode.GetNodeCount(true);
   decimal myChildPercentage = ((decimal)myNodeCount/
     (decimal)myTreeView.GetNodeCount(true)) * 100;

   // Display the tree node path and the number of child nodes it and the tree view have.
   MessageBox.Show("The '" + myTreeView.SelectedNode.FullPath + "' node has " 
     + myNodeCount.ToString() + " child nodes.\nThat is " 
     + string.Format("{0:###.##}", myChildPercentage) 
     + "% of the total tree nodes in the tree view control.");
}

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

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

.NET Framework

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

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

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