Casting Span<T> Example - int to byte and back

SpanCast.cs

using System;
using System.Runtime.InteropServices;

namespace SpanCast
{
    class Program
    {
        static void Main(string[] args)
        {
            //preparing test data
            var intArr = new int[] {1,2,3,4,5,6};
            var byteArr = new byte[intArr.Length * sizeof(int)];
            Buffer.BlockCopy(intArr, 0, byteArr, 0, byteArr.Length);

            //casting the byte array to Span<byte>
            ReadOnlySpan<byte> byteSpan = byteArr;

            //casting Span<byte> to Span<int>
            ReadOnlySpan<int> intSpan = MemoryMarshal.Cast<byte, int>(byteSpan);

            //and back to a single int
            int justOneInt = intSpan[2];
        }
    }
}