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C# TreeView Question

Posted on 2006-06-19
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Last Modified: 2012-08-13
How to traverse a TreeView in C# Windows Form and list all the leaf nodes in the tree?
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Question by:michellechan57
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fffej78 earned 125 total points
ID: 16933034
TreeView.Nodes gives you a collection of TreeNode objects.  A TreeNode object has a number of children (Nodes property).  If if has no nodes, it is a child.

Let's write some recursive code to do this:

If we visit a tree node and the child nodes are zero in size, we have a leaf.  In this case we print out some representation of the tree node.  Otherwise we visit each of the child nodes in turn.

// We start things off like this in whatever method you want, like traverse.
foreach (TreeNode treeNode in treeView1.Nodes)
{
  visit( treeNode );
}

We then define a visitor type pattern. [see http://en.wikipedia.org/wiki/Visitor_pattern ]

private void visit( TreeNode treeNode )
{
  if (treeNode.Nodes.Count == 0)
  {
    // If we want to make this more general, we might have a processor interface passed into this
    // and do something like processor.accept( treeNode ), but here we'll just print it out :)
    System.Console.WriteLine(treeNode.ToString());
  }
  else
  {
    foreach (TreeNode t in treeNode.Nodes)
    {
      visit(t);
    }
  }
}

Obviously it'd be trivial to adapt this to return a list of leaf nodes.
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