SerializationException errors!! & IOException. BinaryFormatter problems

Question

after following the a unity tutorial I keep getting these SerializationException errors...

SerializationException: Type 'PlayerData' in Assembly 'Assembly-CSharp, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' is not marked as serializable.

IOException: Sharing violation on path C:\Users\my PC\AppData\LocalLow\DefaultCompany\newscene\playerInfo.dat

SerializationException: End of Stream encountered before parsing was completed.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using System;
 using System.IO;
 using System.Runtime.Serialization.Formatters.Binary;
  
 public class saveStuff : MonoBehaviour
 {
     public static saveStuff control;
 
     [SerializeField]
     
     public int health;
     void Awake()
     {
  
         if (control == null)
         {
             DontDestroyOnLoad(gameObject);
             control = this;
         }
         else if(control != this)
         {
             Destroy(gameObject);
         }
     }
 
     public void Save()
     {
         BinaryFormatter bf = new BinaryFormatter();
         FileStream file = File.Create(Application.persistentDataPath + "/playerInfo.dat");
 
         PlayerData data = new PlayerData() { };
                
         data.health = health;
         Debug.Log("Save");
         bf.Serialize(file, data);
         file.Close();
       
     }
  
     public void Load()
     {
         if(File.Exists(Application.persistentDataPath + "/playerInfo.dat"))
         {
             BinaryFormatter bf = new BinaryFormatter();
             FileStream file = File.Open(Application.persistentDataPath + "/playerInfo.dat", FileMode.Open);
             PlayerData data = (PlayerData)bf.Deserialize(file);
 
             health = data.health;
             file.Close();
 
          
             Debug.Log("LOAD");
         }
       else
        {
             Debug.Log("no file found! :-( ");
        }
 
       
     }
 
 
 }
 
 [SerializeField]
 public class PlayerData
 {
     
     public int health;
 
 }

what's going on??? I've tried making it work for all day but i can't figure it out!?

Answer 1

Answer by ThomLaurent · Jan 04, 2020 at 07:22 AM

The serialization exception you get gives you hints about what's going wrong, see :

SerializationException: Type 'PlayerData' [...] is not marked as serializable.

You should replace the [SerializeField] field attribute in :

 [SerializeField]
 public class PlayerData
 //...

by the [System.Serializable] class/struct attribute :

 [Serializable]
 public class PlayerData
 //...

For the IOException I guess the file.Close() is not reached due to the other exception, so if you fix the first you fix the second.

This exception happens when you read or write on a file that is still open.

Note : Private fields of a Serializable class/struct are not serialized by default, with the [SerializeField] attribute you force a field serialization.

Hope it helps :)

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SerializationException errors!! & IOException. BinaryFormatter problems

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