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Question by conesco3 · Mar 26, 2017 at 10:08 PM · c#objectlistsclasses

NullReferenceException: Object reference not set to an instance of an object

Hi all,

I have had a look at similar questions and none of them seem to be dealing with the same issue that I have.

Here is my code:

 using System.Collections;
 using System.Collections.Generic;
 using System.IO;
 using UnityEngine;
 
 public class inventory : MonoBehaviour {
 
     public string findFile()
     {
         string dir = System.IO.Path.GetDirectoryName (System.Reflection.Assembly.GetExecutingAssembly ().Location);
         string filePath = dir + "inventory.csv"; 
 
         if (!File.Exists (filePath)) { 
             File.Create (filePath).Close ();
         }
         return filePath;
     }
 
     // Use this for initialization
     public void Start () 
     {
         List<PlayerInventory> CharInv = new List<PlayerInventory>();
 
         string line, fileImportPath = findFile ();
         int i = 0;
 
         using (StreamReader reader = new StreamReader (fileImportPath))
         {
             while ((line = reader.ReadLine ()) != null || i < 10) {
                 CharInv.Add(new PlayerInventory());
                 CharInv[i].assignItem (line);
                 i++;
             }
             reader.Close ();    
         }
     }
 }
 
 public class PlayerInventory
 {
     public string Item = "";
     public int numItems = 0;
     public bool Use = false;
     public string Description = "";
     string[] part = { "", "", "", "" };
         
     public void assignItem (string line)
     {
         part = line.Split (',');
         Item = part [0];
         numItems = int.Parse (part [1]);
         Use = bool.Parse (part [2]);
         Description = part [3];
     }
 }


Here is the error:

 NullReferenceException: Object reference not set to an instance of an object
 PlayerInventory.assignItem (System.String line) (at Assets/Scrips/inventory.cs:52)
 inventory.Start () (at Assets/Scrips/inventory.cs:33)

I have tried to define all the variables that are used in the Class as suggested but it seems to have no effect. Can someone tell me the reason of why this is happening and how to fix it.

Thanks in advance.

EDIT:

Right I have traced the error to the data that is taken in by the class not being assigned properly.

This is the CSV file I am reading in.

 Sword,1,True, A shining longsword
 Medicine,3,True, To make you feel better
 Gun,1,False,An old flintlock style thing
 Sheild,1,True,A wooden sheild with a metal boss

From that file the previous data these are the ones that are being read in and not being read into the classes.

 Yes, Yes, Yes, Yes
 Yes, Yes, No, Yes
 Yes, No, Yes, No
 Yes, No, No, Yes

Any reason why that is?

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avatar image hexagonius · Mar 28, 2017 at 07:14 AM 0
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I would put a debug into assignItem and see what comes in, end what split puts out. Since its not an ArrayOutOfBounds, part seems to be null.

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