/// <summary>
/// Gets an enumerator over all the tree nodes
/// </summary>
/// <param name="treeView"></param>
/// <returns></returns>
public static IEnumerable<TreeNode> GetAllNodes(this TreeView treeView)
{
Stack<IEnumerator> enumerators = new Stack<IEnumerator>();
IEnumerator currentEnumerator = treeView.Nodes.GetEnumerator();
try
{
while (true)
{
// Is there still a node at this level ?
if (currentEnumerator.MoveNext())
{
// Retrieve the new current node
TreeNode node = (TreeNode)currentEnumerator.Current;
// Pushes the enumerator over its children
if (node.Nodes.Count != 0)
{
enumerators.Push(currentEnumerator);
currentEnumerator = node.Nodes.GetEnumerator();
}
// Return this node
yield return node;
}
// Is there a previous level ?
else if (enumerators.Count != 0)
{
// Clean up
IDisposable disposable = currentEnumerator as IDisposable;
disposable?.Dispose();
// Previous level
currentEnumerator = enumerators.Pop();
}
// Then, we're done
else
yield break;
}
}
finally
{
// Clean up the enumerators
foreach (IDisposable disposable in enumerators.OfType<IDisposable>())
{
disposable.Dispose();
}
}
}