Color hex parser

//using System.Globalization;
public static Color ParseColor(string hex) {
            int length = hex.Length;
            if(length != 6 && length != 8)
                throw new ArgumentException($"Color Hex code {hex} is not a valid hex code.");

            var color = new Color32();
            if(
                byte.TryParse(hex.Substring(0, 2), NumberStyles.AllowHexSpecifier, NumberFormatInfo.InvariantInfo, out byte r) &&
                byte.TryParse(hex.Substring(2, 2), NumberStyles.AllowHexSpecifier, NumberFormatInfo.InvariantInfo, out byte g) &&
                byte.TryParse(hex.Substring(4, 2), NumberStyles.AllowHexSpecifier, NumberFormatInfo.InvariantInfo, out byte b))
            {
                color.r = r;
                color.b = b;
                color.g = g;
            } else
                throw new ArgumentException($"Color Hex code {hex} is not a valid hex code.");

            if(length == 8)
                if(byte.TryParse(hex.Substring(6, 2), NumberStyles.AllowHexSpecifier, NumberFormatInfo.InvariantInfo, out byte a))
                    color.a = a;
                else
                    throw new ArgumentException($"Color Hex code {hex} is not a valid hex code.");
            else
                color.a = 0xFF;

            return color;
        }