public static IEnumerable <T> GetDescendants <T>(
ITreeTraversalStrategy strategy,
DependencyObject root,
Func <T, bool> predicate,
Func <DependencyObject, bool> expand) where T : class
{
if (strategy == null)
{
throw new ArgumentNullException("strategy");
}
if (root == null)
{
yield break;
}
var traversal = strategy.Create();
Debug.Assert(traversal != null);
traversal.VisitNodes(TreeHelper.GetChildren(root));
while (traversal.MoveNext())
{
var current = traversal.Current;
var descendant = current as T;
if ((descendant != null) && ((predicate == null) || predicate.Invoke(descendant)))
{
yield return(descendant);
}
if ((expand == null) || expand.Invoke(current))
{
traversal.VisitNodes(TreeHelper.GetChildren(current));
}
}
}
public static IEnumerable <T> GetDescendants <T>(ITreeTraversalStrategy strategy, DependencyObject root, Func <T, bool> predicate) where T : class
{
return(TreeHelper.GetDescendants <T>(strategy, root, predicate, null));
}
public static IEnumerable <T> GetDescendants <T>(ITreeTraversalStrategy strategy, DependencyObject root) where T : DependencyObject
{
return(TreeHelper.GetDescendants <T>(strategy, root, null, null));
}