Searching list with OfType vs GetType == typeof

Question

I have a collection:

public class Cat : Animal {} 
public class Dog : Animal {}

private List<Animal> _animals = new List<Animal>(){ new Cat(), new Dog() };

Lets argue that there are a million "Animal" object with lots of different types of animals in the list.

Which method is quicker:

var animal = _animals.FirstOrDefault(x => x.GetType() == typeof(Dog));

or

var animal = _animals.OfType<Dog>.FirstOrDefault();

Should I use OfType or GetType() == .

Answer 1

At first you have to sort the list and then you can check the results and compare :

var watch = System.Diagnostics.Stopwatch.StartNew();
// the code that you want to measure comes here
watch.Stop();
var elapsedMs = watch.ElapsedMilliseconds;

Calculate the execution time of a method