Serialization object to Json and convert back - Unity [duplicate] - unity3d

Question

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Serialize and Deserialize Json and Json Array in Unity
(9 answers)
Closed 5 years ago.
I have these two classes:
public class MyParent
{
public string a;
public MySub[] b;
}
public class MySub
{
public int sub;
}
I initialize them like this:
myPC = new MyParent();
myPC.a = "test";
myPC.b = new MySub[2];
myPC.b[0] = new MySub();
myPC.b[1] = new MySub();
myPC.b[0].sub = 1;
myPC.b[2].sub = 2;
But when I serialize the object, The result is only {"a":"test"}
string json = JsonUtility.ToJson(myPC);
Debug.Log(json); // {"a":"test"}
How do I do that correctly and convert JSON back to an object?

Answer 1

Internally, JsonUtility uses the Unity Serializer; therefore the object you pass in must be supported by the serializer: it must be a MonoBehaviour, ScriptableObject, or plain class/struct with the Serializable attribute applied.
To ensure a custom class can be serialized, it needs the Serializable attribute
and must follow these rules:
Is not abstract
Is not static
Is not generic, though it may inherit from a generic class
Change your custom class to this:
[System.Serializable]
public class MyParent
{
public string a;
public MySub[] b;
}
[System.Serializable]
public class MySub
{
public int sub;
}
For more in-depth information on Script Serialization, check the official documentation: https://docs.unity3d.com/Manual/script-Serialization.html