Note That, if your API is only going to be used in foreach loops, etc, then you might want to consider just exposing IEnumerable instead. 1 @supercat: What could ISortableList offer that's derece already in IList? Or, asked differently, why couldn't an IList be sorted in-place without re-adding the items https://cobjectkullanm97406.tnpwiki.com/6128228/hakkında_herşey_c_ilist_nerelerde_kullanılıyor