C#; How to Loop Through/Wrap Enumerations when Incremented?-CodePudding

Say you have a byte value equal to its max value, so byte aByte = 255;. When you increment a value past its max value, it usually wraps around to its minimum value, so if I were to write Console.WriteLine( aByte), this would print 0 to the console because it can't exceed its max value.

I would like to have this same effect when it comes to enumerations I create. So let's say this is the code:

using System;

namespace CSharp_Test_003
{
    class Program
    {
        static void Main()
        {
            Console.Title = "Enumerations";

            Season currentSeason = Season.Spring;
            Console.Write($"{currentSeason  } ");
            Console.Write($"{currentSeason  } ");
            Console.Write($"{currentSeason  } ");
            Console.Write($"{currentSeason  } ");
            Console.Write($"{currentSeason  } ");
        }

        private enum Season { Spring = 0, Summer, Autumn, Winter }
    }

Currently this prints out:

Spring Summer Autumn Winter 4

But I would really like it to say "Spring" where there is a "4". If there's a practical way to make this possible I would really love to know.

CodePudding user response：

You can write your own custom enum that works in a similar way

static void Main()
{
    Console.Title = "Enumerations";

    Season currentSeason = Season.Spring;
    Console.Write($"{currentSeason  } ");
    Console.Write($"{currentSeason  } ");
    Console.Write($"{currentSeason  } ");
    Console.Write($"{currentSeason  } ");
    Console.Write($"{currentSeason  } ");
}

//private enum Season { Spring = 0, Summer, Autumn, Winter }

public record Season
{
    public int Id { get; }
    public string Name { get; }
    private static readonly List<Season> _seasons = new();

    public static IReadOnlyList<Season> All => _seasons.OrderBy(x => x.Id).ToList();

    private Season(int id, string name)
    {
        Id = id;
        Name = name;
        _seasons.Add(this);
    }

    public static Season Spring { get; } = new Season(0, nameof(Spring));
    public static Season Summer { get; } = new Season(1, nameof(Summer));
    public static Season Winter { get; } = new Season(3, nameof(Winter));
    public static Season Autumn { get; } = new Season(2, nameof(Autumn));

    public override string ToString() => this.Name;

    public static implicit operator string(Season season) => season.ToString();

    public static Season operator   (Season season)
    {
        if (season.Id == All.Count - 1)
            return All[0];

        return All[season.Id   1];
    }
}