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Question by DaiMangouDev · Jan 03, 2017 at 01:47 PM · c#errorlist

Argument out of range exception

Task i am trying to accomplish.

(1) Find all the GameObjects in the scene with the tag "Enemy", and turn that into a list.(gos list)

(2) if the other list (trs list) count is less than the gos list, instance a new gameobject and add its transform to the trs list

can anyone see why I am getting an "Argument out of range" exception at line 42 here after one value is added to the trs list ?

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
 
 [System.Serializable]
 public class GOb
 {
     public List<GameObject> gos = new List<GameObject>();
     public List<Transform> trs = new List<Transform>();
 
 }
 
 public class listingTest : MonoBehaviour
 {
 
     public List<GOb> GOBS = new List<GOb>();
 
     // Update is called once per frame
     void Update()
     {
         CheckAndSet();
 
     }
 
 
     void CheckAndSet()
     {
         foreach (var item in GOBS.Select((x, i) => new { Value = x, Index = i }))
         {
             item.Value.gos = (GameObject.FindGameObjectsWithTag("Enemy")).ToList();
             if (item.Value.trs.Count < item.Value.gos.Count)
             {
                 GameObject enemyRep = new GameObject("Enemy");
                 item.Value.trs.Add(enemyRep.transform);
                 Debug.Log("added");
 
 
             }
             for (int i = 0; i < item.Value.gos.Count; i++)
             {
                 Debug.Log(item.Value.trs[i]);
 
             }
         }
     }
 
 }
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Answer by UnityCoach · Jan 03, 2017 at 02:06 PM

It's always risky to manage two lists together, I would advise to use a Dictionary. Anyway, the problem here is that you should do a loop and not an if statement, like : So that it adds as many instances.

          {
              item.Value.gos = (GameObject.FindGameObjectsWithTag("Enemy")).ToList();
              for (int a = item.Value.trs.Count, a < item.Value.gos.Count, a++)
              {
                  GameObject enemyRep = new GameObject("Enemy");
                  item.Value.trs.Add(enemyRep.transform);
                  Debug.Log("added");
              }
              for (int i = 0; i < item.Value.gos.Count; i++)
              {
                  Debug.Log(item.Value.trs[i]);
              }
          }
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avatar image DaiMangouDev · Jan 03, 2017 at 02:32 PM 0
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I see, thanks for re$$anonymous$$d me about Dictionaries. This works but I will try Dictionaries too :)

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Answer by dpoly · Jan 03, 2017 at 11:12 PM

You are iterating over the trs list using the gos count. Try

  for (int i = 0; i < item.Value.trs.Count; i++)
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