Why is the array being reset to zero

Code (CSharp):

1.  
2. using UnityEngine;
3. using System;
4. using System.Runtime.Serialization.Formatters.Binary;
5. using System.IO;
6. public class SaveLoadManager
7. {
8.     public static void SavePlayer(Player player)
9.     {
10.         BinaryFormatter bf = new BinaryFormatter();
11.         FileStream stream = new FileStream(Application.persistentDataPath + "/player.sav", FileMode.Create);
12.         PlayerData data = new PlayerData(player);
13.         bf.Serialize(stream, data);
14.         stream.Close();
15.     }
16.     public static int[] LoadPlayer()
17.     {
18.         if (File.Exists(Application.persistentDataPath + "/player.sav"))
19.         {
20.             BinaryFormatter bf = new BinaryFormatter();
21.             FileStream stream = new FileStream(Application.persistentDataPath + "/player.sav", FileMode.Open);
22.             PlayerData data = bf.Deserialize(stream) as PlayerData;
23.             stream.Close();
24.             return data.stats;
25.         }
26.         else
27.         {
28.             Debug.LogError("FFFEEELLEE NNNOOOTTT EXISSSTTT");          
29.             return null;
30.         }
31.     }
32. }
33. [Serializable]
34. public class PlayerData
35. {
36.     public int[] stats = new int[10];
37.     public PlayerData(Player player)
38.     {
39.         stats[player.myday] = 45;
40.     }
41. }

The second script :

Code (CSharp):

1.  
2. using UnityEngine;
3. public class Player : MonoBehaviour
4. {
5.     public int myday;  
6.     public void Start()
7.     {
8.         myday = System.DateTime.Now.Day;
9.     }
10.     public void Save()
11.     {
12.         SaveLoadManager.SavePlayer(this);
13.     }
14.     public void Load()
15.     {
16.         int[] loadedStats = SaveLoadManager.LoadPlayer();
17.         for (int j = 0; j < loadedStats.Length; j++)
18.         {
19.             Debug.Log("DAY   " + (j + 1) + " - " + loadedStats[j]);
20.         }
21.     }
22. }

I create an array and write the number 45 to the cell by day number
Everything works the array is saved to the file /player. sav

BUT! When the day is updated, yesterday's cell is again zero . How do I fix this?

 

I would start by refactoring to avoid BinaryFormatter. Here's why:

https://docs.microsoft.com/en-us/dotnet/standard/serialization/binaryformatter-security-guide

Instead serialize it with JSON, and I recommend using JSON .NET , free from the Unity asset store.

 

Thanks. What do you recommend to save statistics in the app (array[month, day ] =one number ) ?

 

Well. But how do I make the number persist? It's real ?

 

Serialize the data via JSON and it will now be a string.

Write that string to a file, or store it in PlayerPrefs, or send it to a server... up to you!

 

Please look at the code, maybe I did not finish something. I want to beat him . Please !

 

How to overwrite a class instance without creating a new one ?

12 PlayerData data = new PlayerData(player);

 

Depends on the JSON library but with JSON .NET the function is PopulateObject();