public SortedDictionary <string, string[]> ComparePopularityTransfers( PopularityTransferData oldData, PopularityTransferData newData) { // Ignore case changes in popularity transfers. var stopwatch = Stopwatch.StartNew(); var result = CompareData( oldData, newData, "package ID", "popularity transfers", StringComparer.OrdinalIgnoreCase); stopwatch.Stop(); _telemetryService.TrackPopularityTransfersSetComparison(oldData.Count, newData.Count, result.Count, stopwatch.Elapsed); return(result); }