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Question by FabioRambo · May 14, 2018 at 03:32 PM · c#objectclass

Can't get to work a non behaviour constructor with random generated variables

 public class Ship
 {
     public int ShipType;
     public int ShipLvL;
     public int Health;
     public int ShipPosition;

     public int GetPosition()
     {
         ShipPosition = Random.Range(1, 9);
         return ShipPosition;
     }
     public Ship()
     {
         ShipType = Random.Range (1, 3);
         Debug.Log("Type: " + ShipType);
         ShipLvL = Random.Range(1, 10);
         Debug.Log("LVL: " + ShipLvL);
         Health = ShipLvL * ShipType * 500;
         Debug.Log("Health: " + Health);
 
     }
     public int GetH()
     {
         return Health;
     }
 
     public int GetL()
     {
         return ShipLvL;
     }
 
     public int GetT()
     {
         return ShipType;
     }
 }

I have created this Class. As you can see 2 variables are generated Randomly. When i create an object of this class in another script it gets me an error when i run the game: "RandomRangeInt is not allowed to be called from a MonoBehaviour constructor (or instance field initializer), call it in Awake or Start instead. Called from MonoBehaviour 'Stats' on game object ')'."

This is the declaration of the Object:

 public class Stats : MonoBehaviour {
     public Ship MyShip = new Ship();
     public int Health;
     public int LvL, Type;
     // Use this for initialization
   
     void Start () {
 
         
         Health = MyShip.GetH();
         LvL = MyShip.GetL();
         Type = MyShip.GetT();
 
     }

If i doubleclick the error it highlights this lines:

    1.  ShipType = Random.Range (1, 3);
    2.  ShipLvL = Random.Range(1, 10);
    3.  Health = ShipLvL * ShipType * 500;

 


What's the problem?

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Best Answer

Answer by MacDx · May 14, 2018 at 04:11 PM

The problem is exactly what the message says. Specifically this part:

RandomRangeInt is not allowed to be called from a MonoBehaviour constructor (or instance field initializer)


You cannot use Random Range in an instance field initializer. So this line is where the error starts.

 public Ship MyShip = new Ship();

So, instead of calling new Ship(), on your field declaration, you should be calling it inside of Start like this:

 public Ship MyShip;

 void Start(){
     MyShip = new Ship();
     Health = MyShip.GetH();
     LvL = MyShip.GetL();
     Type = MyShip.GetT();
 }

Hope this helps!

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