Common Mistakes and What to Do

Count instead of Any

We should always prefer Any over Count to check if a collection has any elements, or at least one element, that meets a condition.

Let’s write movies.Any() instead of movies.Count() > 0.

The Any method returns when it finds at least one element that meets the condition, but the Count method evaluates the entire query.

Where followed by Any

We can use a condition with Any directly, instead of filtering first with Where to then use Any.

Let’s write the following line:

movies.Any(movie => movie.Rating == 5)

We’ll use the above ...