public IEnumerable <T> DependenciesDeep(T node)
{
var discoveredDeps = new KeyedCollection <string, T>(_getKey);
IEnumerable <T> InnerDescendentDeps(T n)
{
var childDeps = Dependencies(n).ToList();
foreach (var dep in childDeps.Where(c => !discoveredDeps.Contains(c)))
{
yield return(discoveredDeps.AddItem(dep));
}
foreach (var dep in childDeps.SelectMany(InnerDescendentDeps))
{
yield return(dep);
}
}
foreach (var dep in InnerDescendentDeps(node))
{
yield return(dep);
}
}
