Event Sourcing & CQRS Pattern for SPA

handler-username-changed-event-handler.cs

protected override async Task<bool> OnProcessingAsync(BaseEvent ev)
{
  var @event = (ev as UserCreatedEvent);
  var stream = this._mapper.Map(@event);
  this._eventRepository.Add(stream);

  var user = new User
                 {
                   Title = @event.Title,
                   Name = @event.Username,
                   Email = @event.Email
                 };
  this._userRepository.AddOrUpdate(user);

  return await Task.FromResult(true);
}