using System;
using System.Reflection;

public class Test
{
	
	
	
	public static void Main()
	{
		AnimalEntityId id = AnimalEntityId.Parse(Guid.NewGuid().ToString());
		Console.WriteLine(id);
	}
}

public class AnimalEntityId : EntityId<AnimalEntityId>
{
    public AnimalEntityId()
        : base()
    {
    }

    private AnimalEntityId(string value)
        : base(value)
    {
    }

}


public abstract class EntityId<TEntityId>
{
    private readonly System.Guid value;

    public static TEntityId Parse(string val)
    {
    	var constr = typeof(TEntityId).GetConstructor(
    BindingFlags.Instance | BindingFlags.NonPublic,
    null, new[]{typeof(string)}, null);
    	if (constr == null) {
    		throw new InvalidOperationException("No constructor");
    	}
        return (TEntityId)constr.Invoke(new object[] {val});
    }

    protected EntityId(string value)
    {
        this.value = System.Guid.Parse(value);
    }

    protected EntityId()
    {
        this.value = System.Guid.NewGuid();
    }
}