iot/projects/Infrastructure/Extensions/HexExtensions.cs

using System;
using System.Globalization;
using System.Linq;
using System.Text;

namespace Infrastructure.Extensions
{
    public static class HexExtensions
    {
        public static byte[] HexToBytes(this string value)
        {
            if (value is null)
            {
                throw new ArgumentNullException(nameof(value));
            }
            return Enumerable.Range(0, value.Length)
                     .Where(x => x % 2 == 0)
                     .Select(x => Convert.ToByte(value.Substring(x, 2), 16))
                     .ToArray();
        }

        public static string BytesToHex(this byte[] bytes)
        {
            if (bytes is null)
            {
                throw new ArgumentNullException(nameof(bytes));
            }

            var hex = new StringBuilder(bytes.Length * 2);
            foreach (byte b in bytes)
            {
                hex.AppendFormat(CultureInfo.InvariantCulture, "{0:x2}", b);
            }
            return hex.ToString();
        }
    }
}