Cではよくやる p != end イテレーターループ

RefFor.cs

using System;
using System.Runtime.CompilerServices;

class Program
{
    static void Main()
    {
        var array = new[] { 1, 3, 5, 2, 4 };

        PointerInit(array, 1);
        Console.WriteLine(string.Join(", ", array));
        RefInit(array, 2);
        Console.WriteLine(string.Join(", ", array));
    }

    private unsafe static void PointerInit(int[] array, int value)
    {
        fixed (int* p = array)
        {
            // C 言語とかではよくやる書き方
            var end = p + array.Length;
            for (var i = p; i != end; i++)
            {
                *i = value;
            }
        }
    }

    private unsafe static void RefInit(int[] array, int value)
    {
        if (array.Length == 0) return;

        ref var end = ref Unsafe.Add(ref array[0], array.Length);
        for (ref var r = ref array[0]; !Unsafe.AreSame(ref r, ref end); r = ref Unsafe.Add(ref r, 1))
        {
            r = value;
        }
        }
}