TreeNode.Clone Method

Reference

Definition

Namespace:: System.Windows.Forms

Assembly:: System.Windows.Forms.dll

Important

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Copies the tree node and the entire subtree rooted at this tree node.

public:
 virtual System::Object ^ Clone();

public virtual object Clone ();

abstract member Clone : unit -> obj
override this.Clone : unit -> obj

Public Overridable Function Clone () As Object

Returns

Object

The Object that represents the cloned TreeNode.

Implements

Clone()

Examples

The following code example clones the last child tree node of the last root tree node and inserts the clone as the first root tree node in the TreeNodeCollection. This example requires that you have a TreeView control on a Form that contains a collection of TreeNode objects and a Button.

void button4_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
   TreeNode^ lastNode = treeView1->Nodes[ treeView1->Nodes->Count - 1 ]->Nodes[ treeView1->Nodes[ treeView1->Nodes->Count - 1 ]->Nodes->Count - 1 ];
   
   // Clone the last child node.
   TreeNode^ clonedNode = dynamic_cast<TreeNode^>(lastNode->Clone());
   
   // Insert the cloned node as the first root node.
   treeView1->Nodes->Insert( 0, clonedNode );
   MessageBox::Show( String::Concat( lastNode->Text, " tree node cloned and added to ", treeView1->Nodes[ 0 ]->Text ) );
}

private void button4_Click(object sender, System.EventArgs e)
{
   TreeNode lastNode = treeView1.Nodes[treeView1.Nodes.Count - 1].
     Nodes[treeView1.Nodes[treeView1.Nodes.Count - 1].Nodes.Count - 1];

   // Clone the last child node.
   TreeNode clonedNode = (TreeNode) lastNode.Clone();

   // Insert the cloned node as the first root node.
   treeView1.Nodes.Insert(0, clonedNode);
   MessageBox.Show(lastNode.Text + 
     " tree node cloned and added to " + treeView1.Nodes[0].Text);
}

Private Sub button4_Click(sender As Object, _
  e As System.EventArgs) Handles button4.Click
   Dim lastNode as TreeNode
   lastNode = treeView1.Nodes(treeView1.Nodes.Count - 1). _
     Nodes(treeView1.Nodes(treeView1.Nodes.Count - 1).Nodes.Count - 1)

   ' Clone the last child node.
   Dim clonedNode As TreeNode = CType(lastNode.Clone(), TreeNode)

   ' Insert the cloned node as the first root node.
   treeView1.Nodes.Insert(0, clonedNode)
   MessageBox.Show(lastNode.Text & _
     " tree node cloned and added to " & treeView1.Nodes(0).Text)
End Sub

Remarks

The tree structure from the tree node being cloned and below is copied. Any child tree nodes assigned to the TreeNode being cloned are included in the new tree node and subtree.

The Clone method performs a shallow copy of the node. If the value of the Tag property is a reference type, both the original and cloned copy will point to the same single instance of the Tag value.

Applies to

通过