Check existance of asset before loading?

I'm porting my game to Unity, and previously I had optional files that some levels had. Eg. custom animations for certain types of objects. If this custom file didn't exist, a default fallback was used.

Using addressables, it seems you have to hard code the existance of everything's address in advance. How can I test for the existance of an asset?

 

you need to use Addressables.GetDownloadSizeAsync()

if (obj.Result == 0) it means it is already downloaded
anything else means you need to download it

 

That is to check if something has already been loaded, which is different than checking if it exists in the first place.

With some searching I found the right code. It's an async operation...
https://forum.unity.com/threads/uni...dkeyexception-was-thrown.796908/#post-5301735

Code (CSharp):

1. var validateAddress = Addressables.LoadResourceLocationsAsync(address);
2. await validateAddress.Task;
3. if (validateAddress.Status == UnityEngine.ResourceManagement.AsyncOperations.AsyncOperationStatus.Succeeded) {
4.         if (validateAddress.Result.Count > 0) {
5.                 // asset exists go ahead and load
6.         }
7. }