error CS0120: An object reference is required to access non-static member

Question

this line on my code

                         "BoardManager.SpawnChessman(mySecondCanvas11.Constants.PIECE_QUEEN,x,y);"

working ok on the manager script put when i moving it to other script and trying to accessing to it fromm other script i get this error

Assets/Scripts/mySecondCanvas11.cs(24,49): error CS0120: An object reference is required to access non-static member `BoardManager.SpawnChessman(int, int, int)'

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 public class mySecondCanvas11 : MonoBehaviour {
  
 public BoardManager _SpawnChessman;
 public static class Constants
     {
        
                 //public const int PIECE_KING = 0;
                 public const int PIECE_QUEEN = 1;
                 public const int PIECE_ROOK = 2;
                 public const int PIECE_BISHOP = 3;
                 public const int PIECE_KNIGHT=4;
                 public const int PIECE_PAWN = 5;
     }
  
  
 public void PromotePiece (int type)
 {
    switch (type) {
                  case Constants.PIECE_QUEEN:
                            //BoardManager.SpawnChessman(1, x, y);
                             BoardManager.SpawnChessman(mySecondCanvas11.Constants.PIECE_QUEEN,x,y);
  
                            //activeChessman.Remove(selectedChessman.gameObject);
                            //Destroy(selectedChessman.gameObject);
    
  
                           break;
                  case Constants.PIECE_ROOK:
                            // code to make a rook
                           break;
                  // and so on
             }
 }
 }

Answer 1

Answer by stasikgri · Aug 26, 2016 at 07:28 PM

You need a reference to the BoardManager class as its not static. Add this to your class:

  public BoardManager boardManager;

and then use it like that

 boardManager.SpawnChessman(mySecondCanvas11.Constants.PIECE_QUEEN,x,y);

or you can use a singleton pattern if you always have only one board manager in your scene.

 public class BoardManager : MonoBehaviour {
 
     public static BoardManager instance;
     
     void Awake(){
     if(!instance){
        instance = this;
     }else{
        Destroy(gameObject);
     }
 }

and access it like that :

  BoardManager.instance.SpawnChessman(mySecondCanvas11.Constants.PIECE_QUEEN,x,y);

hope this helps!

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error CS0120: An object reference is required to access non-static member

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