OrderBy().Last() or OrderByDescending().First() performance

Question

I know that this probably is micro-optimization, but still I wonder if there is any difference in using

var lastObject = myList.OrderBy(item => item.Crea         


        

Answer 1

In both cases it depends somewhat on your underlying collections. If you have knowledge up front about how the collections look before the order and select you could choose one over the other. For example, if you know the list is usually in an ascending (or mostly ascending) sorted order you could prefer the first choice. Or if you know you have indexes on the SQL tables that are sorted ascending. Although the SQL optimizer can probably deal with that anyway.

In a general case they are equivalent statements. You were right when you said it's micro-optimization.