using System;

using System.Collections.Generic;

using System.Linq;

​

class Subclass<TSubclass, T> 

{

    static Subclass()

    {

        Values = new List<Subclass<TSubclass, T>>();

        System.Runtime.CompilerServices.RuntimeHelpers.RunClassConstructor(typeof(TSubclass).TypeHandle);

    }

    public Subclass()

    {

        if (!Values.Any(i => i.Value.Equals(this.Value)))

        {

            Values.Add(this);

        } 

    }

​

    public T Value { get; set; }

​

    public static List<Subclass<TSubclass, T>> Values { get; private set; }

}

​

class Superclass : Subclass<Superclass, int>

{

    public static Superclass SuperclassA1 = new Superclass { Value = 1 };

    public static Superclass SuperclassA2 = new Superclass { Value = 2 };

    public static Superclass SuperclassA3 = new Superclass { Value = 3 };

    public static Superclass SuperclassA4 = new Superclass { Value = 4 }; 

}

​

public class Program

{

    public static void Main()

    {

        //Console.WriteLine(Superclass.SuperclassA1); //UNCOMMENT THIS LINE AND IT WORKS

        foreach (var value in Superclass.Values)

        {

            Console.WriteLine(value.Value);

        }

    }

}