Short Story about a boy living on a fake tropical island / paradise planet, who was actually an adult CEO but didn't remember it What this code is saying is that if userId was specified, then add a filter on the data so that only items where the userId matches https://cobjectkullanm64051.wikifiltraciones.com/3070736/satın_almadan_Önce_c_ienumerable_nerelerde_kullanılıyor_things_to_know