Performance of LINQ Any vs FirstOrDefault != null

Question

There are multiple places in an Open Source Project (OSP) code I contribute, where it has to be determined if an element in a collection satisfies a certain condition.

Answer 1

My two cents...

I had a huge performance issue with Any(). I am using Telerik grid to display a list of related data, ie,

-I have a "PEOPLE" table

-A "COMPANY" table

-A "PEOPLE_COMPANY" link table

-A "PEOPLE_ROL" link table

-And a "ROL" table with main category, subcategory and description.

The view mixes data and has a few properties which loads data on demand about specific roles (admin, reporter, manager).

var x = GetPeople().Where(p => p.ROLs.Any(i => i.USO_Id == MainCatId && i.TUP_Id == (int)RolType) && p.PER_Id != per_id);

var x = GetPersonas().Where(p => p.ROLs.FirstOrDefault(i => i.USO_Id == MainCatId && i.TUP_Id == (int)RolType) != null && p.PER_Id != per_id);

My grid uses AJAX, and takes over 10 seconds to load using "Any", and 3 or less using "FirstOrDefault". Had not taken the time to debug it as requieres to intercept calls from telerik components and my model.

Hope this helps... so test it well :)