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Question by tuf91497 · Jul 17, 2019 at 06:39 PM · scripting problemeventeventsevent-listenereventlistener

Argument 1: cannot convert from 'method group' to 'UnityAction'

I have the UnityAction < RaycastHit > onHitEvent:

 public class RaycastTrigger: MonoBehaviour
 {
     public void ReceiveRaycast(RaycastHit hit)
     {
         RaycastEventTrigger(hit);
     }   
     [Serializable]
     public class  OnRaycastHit: UnityEvent<RaycastHit> { }
 
     [SerializeField]
     private OnRaycastHit onRaycastHitEvent = new OnRaycastHit();
     public OnRaycastHit onHitEvent { get { return onRaycastHitEvent; } set { onRaycastHitEvent = value; } }
 
     public void RaycastEventTrigger(RaycastHit hit)
     {
         onHitEvent.Invoke(hit);
     }
 }


It invokes when my raycast hits an object with a RaycastTrigger component attached, and passes the raycast hit information onwards. But sometimes I don't need the raycast information, I just want to trigger a generic event by hitting it with a raycast:

     void Start()
     {
         GetComponent<RaycastTrigger>().onHitEvent.AddListener(MyClick);
     }
     public void MyClick()
     {
         ...
     }



When this code is compiled, though, I get the compile error 'Argument 1: cannot convert from 'method group' to 'UnityAction<RaycastHit>'

If I'm using the editor I can use the event editor in the inspector to select Click() in the dropdown menu under static parameters, so I know it must be possible to do via script. Do I need to add static parameters with something besides for a call to AddListener()? I can always just make Click take (RaycastHit hit) as a parameter and then not use it, but that seems wasteful.

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Answer by Hellium · Jul 17, 2019 at 07:17 PM

Either declare MyClick as follow (even if you don't need the parameter)

 public void MyClick( RaycastHit hit )
 {
      
 }


Use a lambda method

  void Start()
  {
      GetComponent<RaycastTrigger>().onHitEvent.AddListener( raycastHit => MyClick() );
  }


Or declare another function as callback, which calls MyClick

  void Start()
  {
      GetComponent<RaycastTrigger>().onHitEvent.AddListener( OnHitEvent );
  }

  public void OnHitEvent( RaycastHit raycastHit )
  {
      MyClick();
  }

  public void MyClick()
  {
      ...
  }
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