private Tuple <TimeSpan, string[], int> FindItems(string prefix)
{
var sw = Stopwatch.StartNew();
var foundItems = AutocompleteTask.GetTopByPrefix(phrases, prefix, 10);
var foundItemsCount = AutocompleteTask.GetCountByPrefix(phrases, prefix);
if (foundItems == null)
{
var oneItem = AutocompleteTask.FindFirstByPrefix(phrases, prefix);
foundItems = oneItem != null ? new[] { oneItem } : new string[0];
}
return(Tuple.Create(sw.Elapsed, foundItems, foundItemsCount));
}