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Question by Fraddeaberg · Jun 13, 2016 at 03:05 PM · c#scripting problemrandom gen

Having problems with Random();

Hello I'm making a tile based strategy game, but i'm having problems with the random function. My new random (r) is appearantly creating problems:

Code:

 using UnityEngine;
 using System.Collections;

 public class TileScript : MonoBehaviour {
     public GameObject grasslandPrefab;
     public GameObject desertPrefab;

     Random r = new Random(); //Making random named "r"
 int randomTG = r.Next(1, 2); //making a int (randomTG) and making it generate 1 or 2
 // Use this for initialization
 void Start () {

     if (randomTG == 1) //if randomTG == 1 a Grassland prefab tile is instantiated.
     {
         Rigidbody instantiatedProjectile = Instantiate(grasslandPrefab
             ,
             transform.position,
             transform.rotation)
             as Rigidbody;
     }else if(randomTG == 2)//if randomTG == 2 a dessert prefab tile is instantiated.
     {
         Rigidbody instantiatedProjectile = Instantiate(desertPrefab
             ,
             transform.position,
             transform.rotation)
             as Rigidbody;
     }
 }
 
 // Update is called once per frame
 void Update () {
 
 }

}

Console output:

Assets/TileScript.cs(9,10): error CS0236: A field initializer cannot reference the nonstatic field, method, or property `TileScript.r´

I´ve looked at other peoples code and i´ve got no idea whats wrong!

Please help!

Console Output Pic:alt text

screenshot-2016-06-13-180144.png (68.7 kB)
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Answer by e4lime · Jun 13, 2016 at 03:54 PM

Use https://docs.unity3d.com/ScriptReference/Random.Range.html instead. For example:

 void Start() {
    int type = Random.Range(0, 2); // returns 0 or 1
    if (type == 0) {
       // do stuff
    }
    else if (type == 1) {
       //do stuff
    }
 }
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Answer by NoseKills · Jun 13, 2016 at 04:02 PM

I think the c# documentation of that error explains it quite clearly.

Instance fields cannot be used to initialize other instance fields outside a method. If you are trying to initialize a variable outside a method, consider performing the initialization inside the class constructor.

You have to do the assignment in Start or Awake.

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