How do I create / Instatiate an array of GameObjects in C#

Question

I'm trying to create an array of "selectors" which will be used in a 3D menu. However, the following code is not working as I expected:

 public int numSelectors = 5;
 public GameObject[] selectorArr;
 public Transform selector; //selected in the editor
 
 // Use this for initialization
 void Start () {
  selectorArr = new GameObject[numSelectors];
  for (int i = 0; i < numSelectors; i++){
  selectorArr[i] = (GameObject)Instantiate(selector, new Vector3((float)i,1,0), Quaternion.Euler(new Vector3(0,0,0))) as GameObject;
  selectorArr[i].transform.localScale = new Vector3(1,1,1);     //This is where the exception occurs.
  }
 }

When I run this code, I get the following error at the localScale line:

 InvalidCastException: Cannot Cast from source type to destination type.

I can't determine why an array of GameObjects would not be able to be edited as GameObjects. Thoughts?

Answer 1

Best Answer

Answer by ScroodgeM · Jul 30, 2012 at 06:05 AM

pay more attention to code. exception should be raised one line higher.

Instantiate returns type of object that was given to it input.

You give to this method a Transform and try to cast returned object to GameObject.

so, give to input GameObject too or cast it to Transform on output.

using UnityEngine;
using System.Collections;
public class TestCodeCS : MonoBehaviour
{
    public int numSelectors = 5;
    public GameObject[] selectorArr;
    public GameObject selector; //selected in the editor
    void Start()
    {
        selectorArr = new GameObject[numSelectors];
        for (int i = 0; i < numSelectors; i++)
        {
            GameObject go = Instantiate(selector, new Vector3((float)i, 1, 0), Quaternion.identity) as GameObject;
            go.transform.localScale = Vector3.one;
            selectorArr[i] = go;
        }
    }
}

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scarletshark · Jul 30, 2012 at 12:27 PM 0

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Thank you for your feedback. The tutorial that I was following used the "Transform" type, and it seemed to work for instantiation. I also find it odd that the Array was allowing me to put non-GameObjects in it when it was initialized as an array of GameObjects. For instance, in my code above, if I comment out the selectorArr[i].Transform... line, it runs properly (which is why I assumed that is where the exception occurred).

ScroodgeM · Jul 30, 2012 at 12:34 PM 1

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this line is not one i needn't 8) this way lets me to call array just once ins$$anonymous$$d of twice 8) little more performance 8)

Answer 2

Answer by mcroswell · Dec 27, 2012 at 09:21 PM

Your code was fine except for the double-cast. Either use "(GameObject)" or "as GameObject", not both. Let me know. Just browsing here.

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How do I create / Instatiate an array of GameObjects in C#

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