Raising events while creating entity

[iTKerry]

Problem

I'm trying to understand of how to raise event while creating entity. For example, you have next line: RaiseDomainEvent(new StudentEmailChangedEvent(Id, email)); This will raise domain event for existing entity with it unique identifier.

Is it possible to do the same, but for entities that wasn't stored to DB? Lets say, I want to know when entity was created and for some reason I need his identifier. Probably attach ID at overload of SaveChanges method, or something like that. Which way is correct from DDD perspective for that simple task?

Thanks!

[vkhorikov]

Good question, and I should've mentioned this in the course. The more appropriate way to raise events would be by passing them a student instance, not the student id. In fact, the passing of the Id contradicts the guideline I mentioned in the course: that you shouldn't use Ids in the domain layer (which domain events are part of).

So:

• Pass the student instance when instantiating an event
• EF Core will assign the id after saving changes
• Even dispatcher will automatically have the student id to work with

[iTKerry]

Thanks for your answer. I just tried and it works like a charm!