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Question by elektronische · Sep 25, 2015 at 01:47 AM · nullreferenceexceptiondrag-and-dropclass objectclass instancegame objects

How GameObject [] is working between 2 classes.

Hi, i have a doubt, i'm sorry if this is something of minor importance but i have to know why this is happening.

I have a script called MyClass1 attached to a GameObject called PlayersManager, with this:

 public GameObject [] players = new GameObject [2];

And i need to access to players from other GameObject with other script (MyClass2), here comes my doubt, if i do this:

 public MyClass1 myClass1;
 myClass1 = GameObject.Find ("PlayersManager").GetComponent<MyClass1>();
 myClass1.players.Length; //in example

I can access correctly to Length value of players in MyClass1.

But if i do this:

 public MyClass1 myClass1;
 myClass1.players.Length; 

Setting myClass1 doing drag and drop of the game object PlayersManager, which contains MyClass1 script.

I get a NullReferenceException when is trying to access to myClass1.players.Length value.

Anyone knows why this happens? Thanks a lot and best regards!

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Answer by cjdev · Sep 25, 2015 at 09:31 AM

I think the problem is that in the second case you're assigning a GameObject to your MyClass1 type variable which means it's not recognizing it as a MyClass1 object but as a GameObject. So if you wanted to drag and drop you could do

  public GameObject myClass1GO;
  myClass1GO.GetComponent<MyClass1>().players.Length;
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