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Private Sub TreeView1_NodeMouseClick(sender As Object, e As TreeNodeMouseClickEventArgs) Handles TreeView1.NodeMouseClick
If e.Button = MouseButtons.Right Then
If e.Node.Text = "ROOT" Then
ContextMenuStrip1.Items.Item("edit").Enabled = False
Else
ContextMenuStrip1.Items.Item("edit").Enabled = True
End If
End If
End Sub
就OK了。