Removing from a list

Questions & Answers
1

I have a list of Transforms of enemies that a healer will heal. However, at times the player will kill and enemy and then I need to remove him from the list. I attempted the following approach:

		if (canHeal && !playerWithinRange ) {
			CheckDistance ();
			if (enemyToHealDistance < distanceCanHeal) {
				CheckNullList();
				_healTarget = healGroup[Random.Range (0, healGroup.Count)];
				goblinAlertEnemyHeal.enemyToHeal = _healTarget.gameObject;				
				StartCoroutine ("HealTiming");
			}
			else {
				CheckNullList();
				_healTarget = healGroup[Random.Range (0, healGroup.Count)];
				goblinAlertEnemyHeal.enemyToHeal = _healTarget.gameObject;
				_state = State.GotoEnemyToHeal;
			}
		}
	}
	
	int _listCntr;
	void CheckNullList() {
		_listCntr = 0;
		foreach (Transform bob in healGroup) {
			Debug.Log (bob.name);
			if (bob != null)
				return;
			else {
				healGroup.Remove (bob);
				healGroup.RemoveAt (_listCntr);
			}
		}
	}

I am thinking that when the player kills the enemy and destroys the object, that position in the list should be null. But, it doesn’t turn null and I’m getting the error :

“MissingReferenceException: The object of type ‘Transform’ has been destroyed but you are still trying to access it.” at
goblinAlertEnemyHeal.enemyToHeal = _healTarget.gameObject;

I have a few ideas that might take a while to get it working, but I thought this approach would be the easiest.

Does anyone know how I can turn that missing reference into something I can check for and remove from the list?

thanks

2

You need to remove the goblin from the list before you destroy the GamObject in order to prevent problems.

Is it an Array or a List?

For an array, manually set the position in the list to null.

For a List, call List.Remove(objectToRemove);