Problem with TryGetComponent, interfaces and inheritance

Unity Engine
1

Hi, the following is happening to me. I have a class that implements an interface.

This is the interface:

public interface IEventInfo
{
        public SEventData EventData { set; get; }
}

And this is the class:

public class EventManager : IEventInfo
{
        public SEventData EventData { set; get; }
}

Then I have another class derived from the above:

public class EntityEventBase : EventManager
{ 
    [Header("Event Data")]
    public SOEventData sOEventData; //ScriptableObject

    public override void Start()
    {
        base.Start();
        eventData = new SEventData(sOEventData); 
        EventData = eventData;
    }
}

And finally I have another “enemy” class derived from the previous one.

public class Enemy : EntityEventBase
{
    public override void Update()
    {
        base.Update();   
        Debug.Log(this + " " + EventData.eventType  + " " + EventData.eventProperty);
    }
}

From the enemy class I can get the “EventData” data without any problem.
But from the Player class I try to read the data and it doesn’t work. Everything has zero value.

Player Class:

public virtual void OnTriggerEnter2D(Collider2D collision)
{
        if (collision.gameObject.TryGetComponent(out IEventInfo iEventInfo))
        {
            Debug.Log(this + " " + collision.gameObject.tag + "  + iEventInfo.EventData.eventType + " -->" + iEventInfo.EventData.eventProperty);
        }
    }

I think the TryGetComponent function is getting the data from the EventManager class instead of the Enemy class.

I am right?
Or am I doing something wrong?
Can I do something to get the data from the Enemy class instead of the EventManager class?

Thank you so much!!

2

Well, if you have multiple components what implements the interface, you will get the very first one in the TryGetComponent. If you have multiple components of the same type, use https://docs.unity3d.com/ScriptReference/GameObject.GetComponents.html and sort it out which one you want. Or change up your strategy and look for the Enemy type in the TryGetComponent.

1 Like
3

Thank you so much for your help!!