Run script after game start, before scene load

Question

I'm making some kind of dependencies solving script. To work this script, it must be run before all other MonoBehaviour scripts.

So I made the script something like this:

public class DependencyController {
    private static Dictionary<string, bool> m_DependencyTable = new Dictionary<string, bool>();

    static DependencyController() {
        SceneManager.sceneUnloaded += ResetDependencyData;
    }

    ... some other stuffs ...
}

I'm using dictionary to compare which dependency script(s) loaded. To can use every script's Awake/Start, I declared as static and instantiated right after.

The system actually work pretty good, all scripts can access DependencyController in Awake/Start without any problem, but have some questions remains:

1. Is static m_DependencyTable is always created before scene loaded?
2. Is static DependencyController constructor always called after SceneManager is loaded? As you can see, I attached EventListener in SceneManager.sceneUnloaded so that I can clear the dependency table before scene loads.

Any advice will very appreciate it.

Answer 1

In Unity we don't Have such a thing. Instead you have to change script running priority. for example you have many scripts that have Awake methods. just go to: Edit > Project Settings> then select the Script Execution Order.

Just find you resolver script and drag it on top of others scripts. this way you make sure that it runs before all of scripts.

Just put

static DependencyController() {
    SceneManager.sceneUnloaded += ResetDependencyData;
}

on awake of that script that runs before all of scripts.