Else Use List. You dirilik't really argue "oh but I KNOW that I will always pass in a List here", then you should take a List not an IList, else you are breaking Liskov substitution principle: "if S is a subtype of T, then objects of type T may be https://cobjectkullanm20739.theideasblog.com/28504743/c-ilist-nasıl-kullanılır-hakkında-gerçekler-açığa