List all child nodes of a parent node in a treeview control in Visual C#

Question

I have a treeview control, and it contains a single parent node and several child nodes from that parent. Is there a way to obtain an array or list of all the child nodes from the main parent? i.e. getting all the nodes from treeview.nodes[0], or the first parent node.

Answer 1

public IEnumerable<TreeNode> GetChildren(TreeNode Parent)
{
    return Parent.Nodes.Cast<TreeNode>().Concat(
           Parent.Nodes.Cast<TreeNode>().SelectMany(GetChildren));
}

Answer 2

You can add to a list recursively like this:

public void AddChildren(List<TreeNode> Nodes, TreeNode Node)
{
    foreach (TreeNode thisNode in Node.Nodes)
    {
        Nodes.Add(thisNode);
        AddChildren(Nodes, thisNode);
    }
}

Then call this routine passing in the root node:

List<TreeNode> Nodes = new List<TreeNode>();
AddChildren(Nodes, treeView1.Nodes[0]);