For loop testings

gistfile1.txt

using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;

namespace MyTests;

public class ForEachTests
{

    private List<int> items = Enumerable.Range(1, 100).ToList();

    public void ForEach()
    {
        foreach (int item in items)
        {
        }
    }

    public void For()
    {
        for (var i = 0; i < items.Count; i++)
        {
            var item = items[i];
        }
    }


    public void ForEachSpan()
    {
        var asSpan = CollectionsMarshal.AsSpan(items);
        foreach (int item in asSpan)
        {
        }
    }

    public void ForSpan()
    {
        var asSpan = CollectionsMarshal.AsSpan(items);
        for (var i = 0; i < asSpan.Length; i++)
        {
            var item = asSpan[i];
        }
    }

}