Fragen bezüglich Aggregate.cs

Aggregate.cs

        protected void ApplyChanges<T>(T changeEvent) where T : class
        {
            var id = IdFrom((dynamic)changeEvent);

            if (id == Guid.Empty)
            {
                try { id = Id; }
                catch (NullReferenceException)
                {
                    throw new ArgumentException(
                        "Unable to find a valid Id for Aggregate. Ensure the Event or Aggregate contains an Id.");
                }
            }

            Changes.Add(new AggregateEventBag<T>((Guid)id){EventData = changeEvent});
        }

        private static Guid IdFrom(object changeEvent)
        {
            var propertyInfos = changeEvent.GetType().GetProperties();

            try
            {
                var identifier = propertyInfos.SingleOrDefault(pi =>
                    pi.Name.Equals("id")
                    | pi.Name.Equals("ID")
                    | pi.Name.Equals("Id")
                    | pi.Name.Equals("iD"));

                return identifier != null
                    ? (Guid)identifier.GetValue(changeEvent)
                    : Guid.Empty;
            }
            catch (Exception)
            {
                return Guid.Empty;
            }
        }