Get a list of all tree nodes (in all levels) in TreeView Controls

Question

How can I get a list of all tree nodes (in all levels) in a TreeView control?

Answer 1

Lazy LINQ approach, just in case you're looking for something like this:

private void EnumerateAllNodes()
{
    TreeView myTree = ...;

    var allNodes = myTree.Nodes
        .Cast()
        .SelectMany(GetNodeBranch);

    foreach (var treeNode in allNodes)
    {
        // Do something
    }
}

private IEnumerable GetNodeBranch(TreeNode node)
{
    yield return node;

    foreach (TreeNode child in node.Nodes)
        foreach (var childChild in GetNodeBranch(child))
            yield return childChild;
}