private static ActorSystem ActorSystemOf(IActorRefFactory context) { if (context is ExtendedActorSystem) { return((ActorSystem)context); } if (context is IActorContext) { return(((IActorContext)context).System); } if (context == null) { throw new ArgumentNullException(nameof(context), "IActorRefFactory must be defined"); } throw new ArgumentException($"ActorRefFactory context must be a ActorSystem or ActorContext, got [{context.GetType()}]"); }