When the Service layer is only executing a task (checking if Id exists, sending an email, etc.), what is the best way for it to let the controller know if there were any errors?
Two solutions I can think of:
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Always passing in an extra “broken rules” parameter by reference to the methods in the Service layer which it would update if there were any error.
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Have the Service raise an exception and having the controller do a try/catch.
Are either one of these two approaches recommended? If not, what approach could I take to have the Service layer let the controller know what something went wrong (such as invalid parameter)?
Your service should collection all the broken rules and after that throw the “BrokenRuleException”. Your controller will catch the “BrokenRuleException” and then use the brokenrules to update the user interface.