enums with extension method: better, C#

enums with extension method: better

//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        [Flags]
        public enum Choices
        {
            First   = 1 << 0,   //1
            Second  = 1 << 1,   //2
            Third   = 1 << 2,   //4
            Fourth  = 1 << 3,    //8
            
            FirstOrSecond = (First | Second)
        }
               
        public static bool IsFirstOrFourth(Choices self)
        {
            return (self & (Choices.First | Choices.Fourth)) > 0;
        }
                
        public static void Main(string[] args)
        {
            Choices allowed =  (Choices.First | Choices.Third);
            
            Console.WriteLine("using inline variable:");
            Console.WriteLine(allowed.HasFlag(Choices.Third));
            Console.WriteLine(allowed.HasFlag(Choices.Fourth));
            
            Console.WriteLine("\nusing flag of extra enum option:");
            Console.WriteLine(Choices.FirstOrSecond.HasFlag(Choices.First));
            Console.WriteLine(Choices.FirstOrSecond.HasFlag(Choices.Third));
            
            Console.WriteLine("\nusing method:");
            Console.WriteLine(IsFirstOrFourth(Choices.First));
            Console.WriteLine(IsFirstOrFourth(Choices.Second));
            
            Console.WriteLine("\nusing extension method:");
            Console.WriteLine(Choices.First.IsOneOf(Choices.First, Choices.Fourth));
            Console.WriteLine(Choices.Third.IsOneOf(Choices.FirstOrSecond));
        }
    }
    
    public static class EnumExtensions
    {
        public static bool IsOneOf(this Enum enumeration, params Enum[] enums)
        {
            return enums.Contains(enumeration);
        }
    }
}


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