public User(Guid id, string name, string email, string provider, string providerKey)
{
RegisterEvents();
var @event = new ExternalUserCreatedEvent(id, name, email, provider, providerKey);
RaiseEvent(@event);
}
void OnExternalCreated(ExternalUserCreatedEvent @event)
{
Id = @event.Id;
Name = @event.Name;
Email = @event.Email;
var account = new Account(@event.Provider, @event.ProviderKey);
Accounts.Add(account);
}