Span

SpanExample.cs

using System;

namespace ConsoleApp1
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            var stringData = "hello Steve";
            var dangerousSpan = stringData.AsSpan();
            dangerousSpan[6] = 'M';

            WriteWord(dangerousSpan);
            Console.WriteLine(stringData);
        }

        public static void WriteWord(ReadOnlySpan<char> word)
        {
            for (var i = 0; i < word.Length; i++)
            {
                Console.Write(word[i]);
            }
            Console.WriteLine();
        }
    }

    public static class Extension
    {
        public static Span<char> AsSpan(this string data)
        {
            var readonlySpan = data.AsReadOnlySpan();
            ref char dataStartRef = ref readonlySpan.DangerousGetPinnableReference();
            var dangerousSpan = Span<char>.DangerousCreate(data, ref dataStartRef, data.Length);
            return dangerousSpan;
        }
    }
}