I have found this method written by Eric Lippert to traverse an object graph:
static IEnumerable<T> Traversal<T>(T item, Func<T, IEnumerable<T>> children)
{
var seen = new HashSet<T>();
var stack = new Stack<T>();
seen.Add(item);
stack.Push(item);
yield return item;
while (stack.Count > 0)
{
T current = stack.Pop();
foreach (T newItem in children(current))
{
if (!seen.Contains(newItem))
{
seen.Add(newItem);
stack.Push(newItem);
yield return newItem;
}
}
}
}
Does anyone have an example of how to use this?
Assuming a Console app, and a directory tree rooted at "C:\TEST", you can do this:
string root = "C:\\Test";
var folders = Traversal(root, Directory.EnumerateDirectories);
foreach (var folder in folders)
Console.WriteLine(folder);
You could also try string root = "C:\\Program Files (x86)";
but you might get access exceptions with that.