Variables set during OnPostProcessAllAssets inside containing class are reset by the time the DidReloadCallbacks callback is reached.

Questions & Answers
1

Hey Everyone!

I’ve been having some headaches with Unity recently, mainly in related to changing player defines based on the importing/removing of components from the project. I’ve narrowed my issue down to where I’m setting static members to be a certain value in the OnPostprocessAllAssets() function, but then when that script reaches the function called by the [UnityEditor.Callbacks.DidReloadScripts] function, that varliable has been reset.

For some very basic code examples:

public class MyClass : AssetPostprocessor
{
    static mybool = false;

    static void OnPostprocessAllAssets (string[] importedAssets, string[] deletedAssets, string[] movedAssets, string[] movedFromAssetPaths) 
    {
        //this is always called before OnScriptsReloaded()
        mybool = true;
    }

    [UnityEditor.Callbacks.DidReloadScripts]
    static void OnScriptsReloaded()
    {
        if(myBool) { 
            //this code is never reached, myBool always is false here
        }
    }
}

If anyone has any insight here on what I’m doing wrong, I’d love to hear it! Ideally, the myBool var will maintain its value across both functions.

2

Hi @massivebacon! The problem is that static variables will be reset when the domain reloads. The only fields that survive a domain reload are serialized/serializable fields on a UnityEngine.Object. (See this page in the documentation.)

In this case I would recommend using something like SessionState.GetBool () and SessionState.SetBool (). I just realized these are unfortunately not documented, so I will try to get that fixed, but they basically let you store a key-value pair that exists as long as your editor session is active