/// <summary>
/// Removes all elements from the tree
/// </summary>
/// <returns>Number of removed elements</returns>
public int Invalidate()
{
// make sure not to use RootNode property since
// calling get; causes parse
List <IAstNode> removedNodes = new List <IAstNode>();
foreach (var child in _astRoot.Children)
{
removedNodes.Add(child);
}
_astRoot.RemoveChildren(0, _astRoot.Children.Count);
if (removedNodes.Count > 0)
{
FireOnNodesRemoved(removedNodes);
}
return(removedNodes.Count);
}