Am I using GetComponents and IgnoreCollision correctly? - unity3d

Question

I'm trying to get a player character in a 2D sidescroller to ignore collisions with specific objects in an array when it does a dash action. But my first attempt isn't working. No errors, it just doesn't work. The character still collides with the specific objects while dashing.
private Collider2D col;
public Collider2D[] dashMasks;
void Awake()
{
col = GetComponent<BoxCollider2D>();
dashMasks = GetComponents<Collider2D>();
}
void Update()
{
if(dashing)
{
foreach(Collider2D mask in dashMasks)
{
Physics2D.IgnoreCollision(col, mask);
}
}
}
Did I do the GetComponenets call incorrectly or did I do the IgnoreCollision incorrectly, or maybe both?

Answer 1

OK. I tested your situation and it's working now.
Unity version is 5.1.2f Personal.
Screenshot of the editor. Cube has 'PlayerController', Rigidbody2D, and BoxCollider2D.
Here is the code. If you press Space bar, you can pass Block sprite. If not press, of course you can't pass.
public class PlayerController : MonoBehaviour {
float speed = 5;
bool dashing = false;
BoxCollider2D coll;
BoxCollider2D blockColl;
void Awake() {
coll = this.transform.GetComponent<BoxCollider2D> ();
blockColl = GameObject.Find ("Block").GetComponent<BoxCollider2D> ();
}
void Update()
{
dashing = Input.GetKey (KeyCode.Space);
Physics2D.IgnoreCollision (coll, blockColl, dashing);
}
void FixedUpdate ()
{
float dirX = Input.GetAxis ("Horizontal");
float dirY = Input.GetAxis ("Vertical");
Vector3 movement = new Vector2 (dirX, dirY);
GetComponent<Rigidbody2D> ().velocity = movement * speed;
}
}

Answer 2

I guess you already set dashMasks in the editor.
So you shouldn't set dashMasks in this script again.
private Collider2D col;
public Collider2D[] dashMasks;
void Awake()
{
col = GetComponent<BoxCollider2D>();
//dashMasks = GetComponents<Collider2D>(); // delete it.
}
void Update()
{
if(dashing)
{
foreach(Collider2D mask in dashMasks)
{
Physics2D.IgnoreCollision(col, mask);
}
}
}