ParseEnum.cs

private static byte ParseDaysOfWeek(ReadOnlySpan<char> text)
            {
                if (text.Length == 4 && char.ToUpper(text[0]) == 'N' && char.ToUpper(text[1]) == 'O' &&
                    char.ToUpper(text[2]) == 'N' && char.ToUpper(text[3]) == 'E'
                )
                    return 0;
                else if (text.Length == 6 && char.ToUpper(text[0]) == 'M' && char.ToUpper(text[1]) == 'O' &&
                    char.ToUpper(text[2]) == 'N' && char.ToUpper(text[3]) == 'D' && char.ToUpper(text[4]) == 'A' &&
                    char.ToUpper(text[5]) == 'Y'
                )
                    return 1;
                else if (text.Length == 7 && char.ToUpper(text[0]) == 'T' && char.ToUpper(text[1]) == 'U' &&
                    char.ToUpper(text[2]) == 'E' && char.ToUpper(text[3]) == 'S' && char.ToUpper(text[4]) == 'D' &&
                    char.ToUpper(text[5]) == 'A' && char.ToUpper(text[6]) == 'Y'
                )
                    return 2;
                else if (text.Length == 9 && char.ToUpper(text[0]) == 'W' && char.ToUpper(text[1]) == 'E' &&
                    char.ToUpper(text[2]) == 'D' && char.ToUpper(text[3]) == 'N' && char.ToUpper(text[4]) == 'E' &&
                    char.ToUpper(text[5]) == 'S' && char.ToUpper(text[6]) == 'D' && char.ToUpper(text[7]) == 'A' &&
                    char.ToUpper(text[8]) == 'Y'
                )
                    return 4;
                else if (text.Length == 8 && char.ToUpper(text[0]) == 'T' && char.ToUpper(text[1]) == 'H' &&
                    char.ToUpper(text[2]) == 'U' && char.ToUpper(text[3]) == 'R' &&
                    char.ToUpper(text[4]) == 'S' && char.ToUpper(text[5]) == 'D' &&
                    char.ToUpper(text[6]) == 'A' && char.ToUpper(text[7]) == 'Y'
                )
                    return 8;
                else if (text.Length == 6 && char.ToUpper(text[0]) == 'F' && char.ToUpper(text[1]) == 'R' &&
                    char.ToUpper(text[2]) == 'I' && char.ToUpper(text[3]) == 'D' &&
                    char.ToUpper(text[4]) == 'A' && char.ToUpper(text[5]) == 'Y'
                )
                    return 16;
                else if (text.Length == 8 && char.ToUpper(text[0]) == 'S' && char.ToUpper(text[1]) == 'A' &&
                    char.ToUpper(text[2]) == 'T' && char.ToUpper(text[3]) == 'U' &&
                    char.ToUpper(text[4]) == 'R' && char.ToUpper(text[5]) == 'D' &&
                    char.ToUpper(text[6]) == 'A' && char.ToUpper(text[7]) == 'Y'
                )
                    return 32;
                else if (text.Length == 6 && char.ToUpper(text[0]) == 'S' &&
                    char.ToUpper(text[1]) == 'U' && char.ToUpper(text[2]) == 'N' &&
                    char.ToUpper(text[3]) == 'D' && char.ToUpper(text[4]) == 'A' &&
                    char.ToUpper(text[5]) == 'Y'
                )
                    return 64;
                else if (text.Length == 8 && char.ToUpper(text[0]) == 'W' &&
                    char.ToUpper(text[1]) == 'E' && char.ToUpper(text[2]) == 'E' &&
                    char.ToUpper(text[3]) == 'K' && char.ToUpper(text[4]) == 'D' &&
                    char.ToUpper(text[5]) == 'A' && char.ToUpper(text[6]) == 'Y' &&
                    char.ToUpper(text[7]) == 'S'
                )
                    return 31;
                else if (text.Length == 8 && char.ToUpper(text[0]) == 'W' &&
                    char.ToUpper(text[1]) == 'E' && char.ToUpper(text[2]) == 'E' &&
                    char.ToUpper(text[3]) == 'K' && char.ToUpper(text[4]) == 'E' &&
                    char.ToUpper(text[5]) == 'N' && char.ToUpper(text[6]) == 'D' &&
                    char.ToUpper(text[7]) == 'S'
                )
                    return 96;
                else if (text.Length == 3 && char.ToUpper(text[0]) == 'A' &&
                         char.ToUpper(text[1]) == 'L' && char.ToUpper(text[2]) == 'L'
                )
                    return 127;
                else
                    //throw new FormatException("Enum of type 'DaysOfWeek' cannot be parsed. Valid values are: None or Monday or Tuesday or Wednesday or Thursday or Friday or Saturday or Sunday or Weekdays or Weekends or All or number within Byte range.");
                    return 0;
            }