Error message when accessing class array

[joshua-lyness]

I have a class called road, as you can see below :

public class Road {
		public int typeIndex;
		public int[] intersection;
		public Bezier[] spline; 
	}

I create an array of this class, using :

Road[] outputRoad = new Road[1];

Within that class, you can see a variable called Bezier, another array of a custom class. This class is :

public class Bezier {
		public Vector3[] controlPoint;
		public float length;
		public BoundingBox boundary;
	}

And within that is an array of Vector3 called controlPoints. Within my code, I need to set controlPoints, however, as expected the code throws up the error

NullReferenceException: Object reference not set to an instance of an object
System.Array.Resize[Bezier] (.Bezier[]& array, Int32 newSize) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System/Array.cs:1913)
roadTool_cs.BuildRoad (.buildInfo roadInfo) (at Assets/toolManager/roadTool_cs.cs:170)
roadTool_cs.Update () (at Assets/toolManager/roadTool_cs.cs:84)

Since I haven’t allocated memory to the arrays. Now I tried doing this :

System.Array.Resize (ref outputRoad, 1);
			System.Array.Resize (ref outputRoad[0].spline, 1);
			System.Array.Resize (ref outputRoad[0].spline[0].controlPoint, 4);

To set the size of the arrays, however on the second line, I get the exact same error as the one above, and I have no idea why. I set the size of every array from the road class, the Bezier class, and also the array of Vector3’s. What am I doing wrong? I had an idea, to put a method within the class, and write something like:

outputRoad = new Road[1];

but I STILL get an error. Anyway thanks for your time, hope you can help.

[Arkaid]

You’re not initializing any array and you can’t resize a null. Do this first:

 public class Road {
         public int typeIndex;
         public int[] intersection = new int[1];
         public Bezier[] spline = new Bezier[1];
     }

 public class Bezier {
         public Vector3[] controlPoint = new Vector3[1];
         public float length;
         public BoundingBox boundary;
     }

Then you can probably Resize.

That said, if you’re going to be resizing arrays, I’d recommend using List<> instead.