FFImageLoading: CachedImage.InvalidateCache has no effect

Hi,

I have a listview with CachedImages bound to an ObservableCollection. When I change elements of the ObservableCollection the Image get’s updated. In cases if only the underlying Imagefile changes I want to have the Image Updated. I’m trying this by calling

        CachedImage.InvalidateCache(imagepath, FFImageLoading.Cache.CacheType.Disk);

But nothing is updated.

This is the Bound Object:

    [ImplementPropertyChanged]
    [JsonObject(IsReference = true)]
    public class CatalogueEntry : INotifyPropertyChanged
    {
        [JsonProperty(IsReference = true)] 
        private Catalogue catalogue;

        public CatalogueEntry(Catalogue parent)
        {
            catalogue = parent;
        }

        public string Name { get; set; }

        public string Description { get; set; }

        public string UUID { get; set; }

        public string ThumbPath
        {
            get { return catalogue.FolderPath + UUID + ".jpg"; }
        }

        public Catalogue Parent
        {
            get { return catalogue; }

            set { catalogue = value; }
        }

        public event PropertyChangedEventHandler PropertyChanged;
    }

In Xaml I bind ImageSource to ThumbPath.

What should I do?