TreeView.ItemHeight Property

Definition

Gets or sets the height of each tree node in the tree view control.

C#
public int ItemHeight { get; set; }

Property Value

The height, in pixels, of each tree node in the tree view.

Exceptions

The assigned value is less than one.

-or-

The assigned value is greater than the Int16.MaxValue value.

Examples

The following code example changes the size NodeFont to the specified size and adjusts the ItemHeight of the tree node's parent TreeView control. This example requires that you have a Form with a TreeView control with a collection of TreeNode objects, and a ComboBox that contains font sizes.

C#
private void Button1_Click(object sender,EventArgs e)
{
   myTreeView.ItemHeight = 5;
   myTreeView.SelectedNode.NodeFont = new Font("Arial",5);

   // Get the font size from combobox.
   string selectedString = myComboBox.SelectedItem.ToString();
   int myNodeFontSize = Int32.Parse(selectedString);

   // Set the font of root node.
   myTreeView.SelectedNode.NodeFont = new Font("Arial",myNodeFontSize);
   for(int i = 0; i < myTreeView.Nodes[0].Nodes.Count; i++)
   {
      // Set the font of child nodes.
      myTreeView.Nodes[0].Nodes[i].NodeFont =
        new Font("Arial",myNodeFontSize);
   }

   // Get the bounds of the tree node.
   Rectangle myRectangle = myTreeView.SelectedNode.Bounds;
   int myNodeHeight = myRectangle.Height;
   if(myNodeHeight < myNodeFontSize)
   {
      myNodeHeight = myNodeFontSize;
   }
   myTreeView.ItemHeight = myNodeHeight + 4;
}

Remarks

If the item height is set to a value larger than the height of the tree view control, calling the TreeNode.EnsureVisible method will have unexpected results.

Applies to

Product Versions
.NET Framework 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
Windows Desktop 3.0, 3.1, 5, 6, 7, 8, 9

See also