Unity 3D – C# script – save and load file.

This is a simple C# script example for a C# class Player.
The class Player come with this content into Player.cs C# script:

using UnityEngine;
using System.Collections;
public class Player : MonoBehaviour {
    public int level = 1;
    public int energy = 100;
    public int health = 100;
    public int attack = 5;
    public int defense = 2;

    //make Save and Load 
    public void Save() {
        SaveLoadManager.SavePlayer(this);
    }
    public void Load() {
        int[] loadStat = SaveLoadManager.LoadPlayer();
        level = loadStat[0];
        energy = loadStat[1];
        health = loadStat[2];
        attack = loadStat[3];
        defense = loadStat[4];
    }
// Use this for initialization
    void Start () {
	
	}
// Update is called once per frame
    void Update () {
	
	}
}

using UnityEngine;

using System.Collections;

public class Player : MonoBehaviour {

public int level = 1;

public int energy = 100;

public int health = 100;

public int attack = 5;

public int defense = 2;

//make Save and Load

public void Save() {

SaveLoadManager.SavePlayer(this);

}

public void Load() {

int[] loadStat = SaveLoadManager.LoadPlayer();

level = loadStat[0];

energy = loadStat[1];

health = loadStat[2];

attack = loadStat[3];

defense = loadStat[4];

}

// Use this for initialization

void Start () {

}

// Update is called once per frame

void Update () {

}

To make this C# script for saving the Player into one file I used this C# script named SaveLoadManager.cs:

using UnityEngine;
using System;
using System.Collections;
using System.Runtime.Serialization.Formatters.Binary;
using System.IO;

public static class SaveLoadManager {

    public static void SavePlayer(Player player)
    {   //create binary file 
        BinaryFormatter bf = new BinaryFormatter();
        FileStream stream = new FileStream(Application.persistentDataPath+"/player.sav",FileMode.Create);
        //this will use the class PlayerData 
        PlayerData data = new PlayerData(player);
        //use Serialize - 
        bf.Serialize(stream, data);
        //close file stream
        stream.Close();
    }
    //load the file 
    public static int[] LoadPlayer() {
        //check the file exist
        if (File.Exists(Application.persistentDataPath + "/player.sav"))
        {
            //open binary file 
            BinaryFormatter bf = new BinaryFormatter();
            FileStream stream = new FileStream(Application.persistentDataPath + "/player.sav", FileMode.Open);
            PlayerData data = bf.Deserialize(stream) as PlayerData;
            //close file stream
            stream.Close();
            //return data from file
            return data.stats;
        }
        else {
            Debug.LogError("File don't exist!");
            return new int[5];
        }
    }
}
// need to use using System; to use Serializable area.
[Serializable]

public class PlayerData {
    // more convenient for us to store data
    public int[] stats;
    public PlayerData(Player player) {
        stats = new int[5];
        stats[0] = player.level;
        stats[1] = player.energy;
        stats[2] = player.health;
        stats[3] = player.attack;
        stats[4] = player.defense;
    }
}

using UnityEngine;

using System;

using System.Collections;

using System.Runtime.Serialization.Formatters.Binary;

using System.IO;

public static class SaveLoadManager {

public static void SavePlayer(Player player)

{ //create binary file

BinaryFormatter bf = new BinaryFormatter();

FileStream stream = new FileStream(Application.persistentDataPath+"/player.sav",FileMode.Create);

//this will use the class PlayerData

PlayerData data = new PlayerData(player);

//use Serialize -

bf.Serialize(stream, data);

//close file stream

stream.Close();

}

//load the file

public static int[] LoadPlayer() {

//check the file exist

if (File.Exists(Application.persistentDataPath + "/player.sav"))

{

//open binary file

BinaryFormatter bf = new BinaryFormatter();

FileStream stream = new FileStream(Application.persistentDataPath + "/player.sav", FileMode.Open);

PlayerData data = bf.Deserialize(stream) as PlayerData;

//close file stream

stream.Close();

//return data from file

return data.stats;

}

else {

Debug.LogError("File don't exist!");

return new int[5];

}

// need to use using System; to use Serializable area.

[Serializable]

public class PlayerData {

// more convenient for us to store data

public int[] stats;

public PlayerData(Player player) {

stats = new int[5];

stats[0] = player.level;

stats[1] = player.energy;

stats[2] = player.health;

stats[3] = player.attack;

stats[4] = player.defense;

}

The script come with two parts for save and load files.
I used Serializable property to save binary file named player.sav.
This script used also the Application.persistentDataPath to take the path of application.
I used a Debug log output but if you want to used into real application then is no need to use.
You can deal with any player settings and make new like: player.magic or player.status.
Take a look at the comments in the script and that script highlights design issues.