treenode.clone method

[bclegg]

Hi,
When I implement the example code it errors with
'No parameterless constructor defined for this object.'

experimenting with dim o as object = mytreenode.clone() gives the same
error.

The example code is:
Private Sub Button1_Click(ByVal sender As Object, ByVal e As
System.EventArgs) Handles Button1.Click
Dim lastNode As TreeNode
lastNode = tvAvailable.Nodes(tvAvailable.Nodes.Count - 1). _
Nodes(tvAvailable.Nodes(tvAvailable.Nodes.Count -
1).Nodes.Count - 1)

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

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

End Sub

Is this method flawed? Does anybody have working code for copying a
treenode from one tree to another?
Thanks
Bob
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[Peter Huang]

Hi Bob,

I can not reproduce the problem with the code below.
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
For i As Integer = 0 To 7
Me.TreeView1.Nodes.Add("Hello" + i.ToString())
Next
Me.TreeView1.Nodes(7).Nodes.Add("Test")
End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.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

Also you may try to check if you have another class named TreeNode.
I think you may try to declare the TreeNode as below
System.Windows.Forms.TreeNode instead of TreeNode.
Best regards,

Peter Huang
Microsoft Online Partner Support

Get Secure! - www.microsoft.com/security
This posting is provided "AS IS" with no warranties, and confers no rights.

[bclegg]

Hi Peter,
Problem solved.
Your code pointed the way.
My tree view had a root node which was a derived class and had no
parameterless constructor.
Thanks
Bob
Peter Huang wrote:

Hi Bob,

I can not reproduce the problem with the code below.
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
For i As Integer = 0 To 7
Me.TreeView1.Nodes.Add("Hello" + i.ToString())
Next
Me.TreeView1.Nodes(7).Nodes.Add("Test")
End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.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

Also you may try to check if you have another class named TreeNode.
I think you may try to declare the TreeNode as below
System.Windows.Forms.TreeNode instead of TreeNode.
Best regards,

Peter Huang
Microsoft Online Partner Support

Get Secure! - www.microsoft.com/security
This posting is provided "AS IS" with no warranties, and confers no rights.

--
Please take out the garbage before using reply address.