static void Main(string[] args)
{
var dictionary = new Dictionary <int, Node>();
using (TextReader reader = File.OpenText("test.txt"))
{
string line;
while ((line = reader.ReadLine()) != null)
{
RawNode raw = RawNode.FromLine(line);
Node parent = raw.ParentId == 0 ? null : dictionary[raw.ParentId];
Node node = new Node {
Id = raw.Id, Parent = parent, Title = raw.Title
};
if (parent != null)
{
parent.Children.Add(node);
}
dictionary[node.Id] = node;
}
}
Node root = dictionary[1];
root.Dump();
}