Selecting Nodes
Selecting a Single Node
To select a node use the Selected property of RadTreeNode. The following example demonstrates how to do it.
radTreeView1.SelectedNode = radTreeView1.Nodes[0];
RadTreeView1.SelectedNode = RadTreeView1.Nodes(0)
Selecting Multiple Nodes
To enable the multiple selection the MultiSelect property must be set to true. The default value is false.
| Selection | Example | Description |
|---|---|---|
| Single Selection |  |
The user can select a single node by clicking the node. |
| Multiple Selection using the Shift key |  |
To select a continuous series of multiple nodes at one time hold Shift and click on a node using the mouse. That will select all nodes between the first selected node and the node that was just clicked. The screenshot shows nodes selected between "Deleted Items" and "Large Mail". |
| Multiple Selection using the Ctrl key |  |
To select multiple nodes in distributed throughout, hold Ctrl and click on each node using the mouse. That will select the clicked node or unselect the previously selected nodes. The screenshot shows the "Deleted Items" and "Send Items" nodes selected. |
Selecting Multiple Nodes Programmatically
To select multiple nodes through the API, just set the Selected property of the desired nodes to true. The example below adds four nodes, then selects the last two nodes.
radTreeView1.MultiSelect = true;
RadTreeNode Node1 = new RadTreeNode("Inbox");
RadTreeNode Node2 = new RadTreeNode("Deleted Items");
RadTreeNode Node3 = new RadTreeNode("Outbox");
RadTreeNode Node4 = new RadTreeNode("Sent");
radTreeView1.Nodes.Add(Node1);
radTreeView1.Nodes.Add(Node2);
radTreeView1.Nodes.Add(Node3);
radTreeView1.Nodes.Add(Node4);
Node3.Selected = true;
Node4.Selected = true;
RadTreeView1.MultiSelect = True
Dim Node1 As New RadTreeNode("Inbox")
Dim Node2 As New RadTreeNode("Deleted Items")
Dim Node3 As New RadTreeNode("Outbox")
Dim Node4 As New RadTreeNode("Sent")
RadTreeView1.Nodes.Add(Node1)
RadTreeView1.Nodes.Add(Node2)
RadTreeView1.Nodes.Add(Node3)
RadTreeView1.Nodes.Add(Node4)
Node3.Selected = True
Node4.Selected = True
SelectedNodeChanged Event
When multiple selection functionality is turned on, the SelectedNodeChanged event will be called twice: first for the previously selected node first and one more time for the newly selected node. In the RadTreeViewEventArgs you can distinguish the two event firings by the Action property which is set to Unknown when the selection is cleared.
private void radTreeView1_SelectedNodeChanged(object sender, Telerik.WinControls.UI.RadTreeViewEventArgs e)
{
if (e.Action != Telerik.WinControls.UI.RadTreeViewAction.ByMouse)
{
Console.WriteLine(e.Node.Text);
}
}
Private Sub RadTreeView1_SelectedNodeChanged(ByVal sender As Object, ByVal e As Telerik.WinControls.UI.RadTreeViewEventArgs)
If e.Action <> Telerik.WinControls.UI.RadTreeViewAction.ByMouse Then
Console.WriteLine(e.Node.Text)
End If
End Sub
Another approach will be to check the Selected property of the node. If it is true, execute your logic.
private void radTreeView2_SelectedNodeChanged(object sender, RadTreeViewEventArgs e)
{
if (e.Node.Selected == true)
{
Console.WriteLine(e.Node.Text);
}
}
Private Sub RadTreeView2_SelectedNodeChanged(ByVal sender As Object, ByVal e As RadTreeViewEventArgs)
If e.Node.Selected = True Then
Console.WriteLine(e.Node.Text)
End If
End Sub