What interface should my service return? IQueryable, IList, IEnumerable?

Question

Imagine I have a SearchService layer that has a method to search all cars starting with a certain string;

public static class Searcher{
    public IAnInterface&l         


        

Answer 1

IQueryable would have a rather heavy requirement on it -- you couldn't, for example, return an array.

Usually for me, the choice between IEnumerable or IList usually ends up being whichever is easier to implement in the standard case.