IList.cs

using System.Collections.Generic;
using System.Linq;
using BenchmarkDotNet.Attributes;

namespace StructLinq.Benchmark
{
    [MemoryDiagnoser]
    public class IList
    {
        private const int Count = 10_000;
        private readonly IList<int> list;

        public IList()
        {
            list = Enumerable.Range(0, Count).ToList();
        }

        [Benchmark(Baseline = true)]
        public int Linq()
        {
            var sum = 0;
            foreach (var i in list)
            {
                sum += i;
            }

            return sum;
        }

        [Benchmark]
        public int StructLinq()
        {
            var sum = 0;
            foreach (var i in list.ToStructEnumerable())
            {
                sum += i;
            }
            return sum;
        }
    }
}