Use direct methods (ARCH604)

Key dotnet.performance.use-direct-methods · Severity info · Category performance

Collections like List expose direct members such as Count that run without the overhead of LINQ extensions.

Incorrect

List<int> numbers = GetNumbers();
var total = numbers.Count();   // LINQ extension

Correct

List<int> numbers = GetNumbers();
var total = numbers.Count;     // direct property

Fix

Use the direct property/method when available (e.g. List.Count).