Using GetComponent on a GameObject in an Array

Questions & Answers
1

I am having trouble accessing a script on a game object which is in an array. Can anyone help. I get the ‘Object reference not set to an instance of an object’ error when I run this line of code:

if (woodStacks*.GetComponent<InventoryStack>().value == 50)*

woodStacks is a GameObject[] array

3

You should try like:

public GameObject[] woodStacks = new GameObject[yourNumberOfElements];

Or at some later stage:

woodStacks = new GameObject[yourNumberOfElements];

In a loop:

GameObject newStack = Instantiate (stackPrefab, transform.position, transform.rotation) as GameObject; 
woodStacks *= newStack;*

and whenever needed:
if (woodStacks*.GetComponent().value == 50)*
Using arrays are an older approach, try using System.Collection.Generics.List<T>. This way you don’t have to specify the number of element at the time of allocation, and there are several other advantages. See [this][1].
Hope it helps!
_*[1]: .net - Array versus List<T>: When to use which? - Stack Overflow

2

Hi @AlexGan001

public List<GameObject> woodStacks;

(in a loop:)

GameObject newStack = Instantiate (stackPrefab, transform.position, transform.rotation) as GameObject; 
woodStacks.Add(newStack)

when you need to change value

if (woodStacks*.GetComponent<InventoryStack>().value == 50)*

Check your field / variable / property named value is public, if it is not set as public you can;t access even after you get componant, Also check stackPrefab has script has attahced InventoryStack, also confrim when you instantiate it it would not be deactivate mode. If it is deactivate mode GetComponant will may not work.