public abstract class Aggregate
  {
    private readonly List<Event> newEvents = new List<Event>();
    public Guid Id { get; protected set; }
    public IEnumerable<Event> NewEvents => this.newEvents.AsReadOnly();

    public void Replay(List<Event> events)
    {
      foreach (var @event in events)
        Play(@event);
    }

    protected void Emit(Event @event) { ... }

    private void Play(Event @event) {... }
  }