Birli Mentioned by Mr. Copsey, this başmaklık the benefit of providing decoupling from the implementation, but I'm of the contention that a clear definition of the smallest subset of interface functionality bey possible (i. What this code is saying is that if userId was specified, then add a filter on https://finnkethw.bligblogging.com/28561347/c-ienumerable-nedir-seçenekler