Arrays Issue

I have two snippets of code, one which is the main function, Run(). The idea is to loop through a Tileset, and input each of the tilebases into my created class. This should happen at
inputMapContainer[x, y].SingleTile = inputTiles[x, y];

however i instead get a NullReferenceException: Object not set to an instance of an object.

What am I missing here? Also please ignore the setting 1d array into a 2-d array first, this was to be a work around if i could, but alas didnt work.

Code (CSharp):

1.   [SerializeField] Tilemap InputMap;
2.    [SerializeField] Tilemap outputMap;
3.    public  TileBase[] allTiles;
4.    public BoundsInt bounds;
5.    public TileBase[,] inputTiles;
6.    public TileContainer[,] inputMapContainer;
7.  
8. void Run()
9.     {
10.         InputMap.CompressBounds();
11.         bounds = InputMap.cellBounds;
12.         TileBase[] allTiles = InputMap.GetTilesBlock(bounds);
13.         inputTiles = new TileBase[bounds.size.x,bounds.size.y];
14.         inputMapContainer = new TileContainer[bounds.size.x, bounds.size.y];
15.  
16.         for(int x = 0; x < bounds.size.x; x++)
17.             for(int y = 0; y < bounds.size.y; y++)
18.             {
19.                 if (allTiles[x + y * bounds.size.x] == null)
20.                 {
21.                     Debug.Log("Null tile, will not work, location: " + x + " and " + y);
22.                 }
23.              
24.                   inputTiles[x, y] = allTiles[x + y * bounds.size.x];
25.                 Debug.Log(inputTiles[x, y].name + " this is a 2D array" + x + " " + y);
26.                 // Debug.Log(allTiles[x + y * bounds.size.x].name);
27.                 inputMapContainer[x, y].SingleTile = inputTiles[x, y];
28.             }
29.     }

Code (CSharp):

1. public class TileContainer : MonoBehaviour
2. {
3.  
4.     public TileBase SingleTile;
5.     List<TileBase> possibleUpTiles;
6.     List<TileBase> possibleDownTiles;
7.     List<TileBase> possibleLeftTiles;
8.     List<TileBase> possiblRightTiles;
9.     List<TileBase> possibleTilesForThis;
10.     bool hasBeenCollapsed = false;
11.     bool hasCollision = false;
12. }

 

What line is giving you the NRE?

 

Line 27.

 

Ah! When you make an array of objects (like your TileContainer), C# does not fill the slots of the array with objects; each slot is null. You have to create the object first, then add it to that index.
I also see that your TileContainer is a monobehaviour. You might have to use something else, like scriptable objects because Monos are intended to be components attached to gameobjects.

 

I would guess then in the line before if i went

inputmapContainer[x,y] = new TileContainer;

i also added a quick constructor to the script, and it seems have fixed it.
that would also solve my issue?

 

So my solution was to add a constructor for TileContainer

Code (CSharp):

1.   public TileContainer(TileBase newTile)
2.     {
3.         SingleTile = newTile;
4.     }

and change the line at 27 to

inputMapContainer[x, y] = new TileContainer(inputTiles[x, y]);