If Your class is a custom collection class then yes, it should implement IEnumerable. In this case a public property for the inner list would be redundant. Imagine a simple class: What this code is saying is that if userId was specified, then add a filter on the veri so https://lukaswhpxe.blogolize.com/benim-c-ienumerable-nedir-başlarken-Çalışmak-67519354