add function to event Trigger from code unity code example

Example: event trigger by code unity

EventTrigger trigger = GetComponentInParent<EventTrigger>();
 EventTrigger.Entry entry = new EventTrigger.Entry();
 entry.eventID = EventTriggerType.PointerClick;
 entry.callback.AddListener( (eventData) => { Foo(); } );
 trigger.triggers.Add(entry);