Addressables LoadAllAssets

AddressablesLoadAllAssets.cs

public IEnumerator LoadAllAssets<T>(OnLoadAssetsCallback<T[]> callback) where T : Object
{
    List<IResourceLocation> locations = getLocationsForType<T>();
    AsyncOperationHandle<IList<T>> asyncOperation = Addressables.LoadAssetsAsync<T>(locations, null);
    yield return asyncOperation;
    if (asyncOperation.Status == AsyncOperationStatus.Succeeded)
    {
        callback(asyncOperation.Result.ToArray());
    }
}

private List<IResourceLocation> getLocationsForType<T>()
{
    Dictionary<string, IResourceLocation> locations = new Dictionary<string, IResourceLocation>();
    foreach (IResourceLocator locator in Addressables.ResourceLocators)
    {
        foreach (object key in locator.Keys)
        {
            if (!locator.Locate(key, typeof(T), out var keyLocation))
                continue;

            IResourceLocation location = keyLocation[0];
            if (!locations.ContainsKey(location.PrimaryKey))
            {
                locations.Add(location.PrimaryKey, location);
            }
        }
    }

    return locations.Select(l => l.Value).ToList();
}