c# 2d bool array error

Unity Engine
1

I define the 2d array
public static bool[,] TileStates;

I set it in Start()
bool[,] TileStates = new bool[gridX,gridY];

But I test it in Update()
if ( TileStates[x,y] == true ){

I get object reference not set to an instance of an object!

Any clues?

2

Try initializing with a default value every position of the array

3

Thanks for coming back so quick!

Reading around it looks like I needed to fill the array before accessing it so I added
TileStates[x,y] = false; // set all tiles to LOCKED to start with.
in the loop, but still get the same pesky error ;(

Any other ideas?

4

Do you really want to declare the array static? That means it will be shared between all instances of your object. Also your line in Start() is declaring a new local variable, not assigning to the existing one.

Try this instead:

	public bool[,] TileStates;
	
	void Start()
	{
		TileStates = new bool[gridX,gridY];
		
		// Other code
	}
	
	void Update()
	{
		// Other code
		
		if ( TileStates[x,y] == true ){
			// Other code
		}
		
		// Other code
	}
5

That works and I understand where I went wrong.

Thanks for your patience!

  • Andy