Benchmark MaxBy

Benchmarks.cs

using System;
using System.Collections.Generic;
using System.Linq;
using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Configs;
using BenchmarkDotNet.Running;
using NUnit.Framework;

namespace TestProject1
{
    public record Employee(string Name, int HoursPerWeek);

    [SimpleJob]
    public class MaxByBenchmarks
    {
        static readonly Random Rnd = new();
        List<Employee> employees;

        [GlobalSetup]
        public void Setup()
        {
            employees = Generate().ToList();
        }

        [Benchmark]
        public void Aggregating() =>
            employees
                .Aggregate((max, next) => next.HoursPerWeek > max.HoursPerWeek
                    ? next
                    : max);

        [Benchmark]
        public void Sorting() =>
            employees.OrderByDescending(x => x.HoursPerWeek).First();

        IEnumerable<Employee> Generate()
        {
            const int count = 100000;
            for (var i = 0; i < count; i++)
                yield return new Employee(
                    $"name{i}",
                    Rnd.Next(count));
        }
    }

    public class BenchmarkTests
    {
        [Test]
        public void BenchmarkMaxBy()
        {
            var manualConfig = DefaultConfig.Instance
                .WithOptions(ConfigOptions.DisableOptimizationsValidator);
            BenchmarkRunner.Run<MaxByBenchmarks>(manualConfig);
        }
    }
}