Reading from a file

Learn to read saved data with File.ReadAllText.

File Checking and File.ReadAllText

Checking whether a file exists on disk with File.Exists(path) before reading prevents runtime exceptions. If verified, calling File.ReadAllText(path) retrieves the full file content as a string.

using System.IO;

if (File.Exists(path)) {
    string json = File.ReadAllText(path);
}

If the file is not found, a fresh profile initialized with default values can be created instead.

Deserialization: JsonUtility.FromJson

Rebuilding a live C# object from a retrieved JSON string is known as deserialization. The generic JsonUtility.FromJson<T>(json) method constructs an instance of type T and fills its fields.

// Restoring an object from a JSON string
PlayerData data = JsonUtility.FromJson<PlayerData>(json);
Debug.Log("Loaded health: " + data.health);

This seamlessly restores the player's health, score, and items back into active memory.

Exercise Save file reading flow

Define a Start method. Inside, declare bool dosyaVar = true; and print "Kayit dosyasi bulundu: " + dosyaVar to the console.

Show example solution

using UnityEngine;

public class SaveReader : MonoBehaviour
{
    void Start()
    {
        bool dosyaVar = true;
        Debug.Log("Kayit dosyasi bulundu: " + dosyaVar);
    }
}

Test yourself

Which method is used to safely verify the existence of a file before attempting to open it?
- File.Find(path)
- File.HasFile(path)
- File.Exists(path)
- File.Validate(path)
Show answer

File.Exists(path) — The System.IO.File.Exists(path) method returns a boolean (true/false) indicating whether a file exists at the given path.

Instantiate object from JSON

PlayerData data = JsonUtility.____<PlayerData>(jsonString);

Show answer

PlayerData data = JsonUtility.FromJson<PlayerData>(jsonString);

File reading concepts

File.Exists

Checks if the file exists on disk
File.ReadAllText

Reads all text from the file
FromJson

Converts JSON text into a C# object
Deserialization

Process of restoring an object from text

Next lesson: Save game schema

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