一直想偷下懒，不写递归遍历，谁知最后还是被现实教做人...

private IEnumerable<TreeNode> FindTreeNodes(TreeNode paretenNode)
{
    var treeList = new List<TreeNode>();
    treeList.Add(paretenNode);
    // 
    foreach (TreeNode subNode in paretenNode.Nodes)
    {
        if (subNode.Nodes.Count > 0)
        {
            treeList.AddRange(FindTreeNodes(subNode));
        }
        else
        {
            treeList.Add(subNode);
        }
    }
    return treeList;
}

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