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TreeView.GetNodeCount Method

Retrieves the number of tree nodes, optionally including those in all subtrees, assigned to the tree view control.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)

public int GetNodeCount (
	bool includeSubTrees
)
public int GetNodeCount (
	boolean includeSubTrees
)
public function GetNodeCount (
	includeSubTrees : boolean
) : int

Parameters

includeSubTrees

true to count the TreeNode items that the subtrees contain; otherwise, false.

Return Value

The number of tree nodes, optionally including those in all subtrees, assigned to the tree view control.

If includeSubTrees is true, the result is the number of all the tree nodes in the entire tree structure.

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 tre 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.");
}

private void myButton_Click(Object sender, System.EventArgs e)
{
    // Set the tre view's PathSeparator property.
    myTreeView.set_PathSeparator(".");
    // Get the count of the child tree nodes contained in the SelectedNode.
    int myNodeCount = myTreeView.get_SelectedNode().GetNodeCount(true);
    System.Decimal myChildPercentage =
        Decimal.Multiply(Decimal.Divide(new Decimal(myNodeCount),
        new Decimal(myTreeView.GetNodeCount(true))), new Decimal(100));
    // Display the tree node path and the number of child nodes it and the
    // tree view have.
    MessageBox.Show("The '" + myTreeView.get_SelectedNode().get_FullPath()
        + "' node has " + ((Int32)myNodeCount).ToString()
        + " child nodes.\nThat is " + String.Format("{0:###.##}",
        myChildPercentage)
        + "% of the total tree nodes in the tree view control.");
} //myButton_Click

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

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

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0
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