Images downloaded in a async method shown after coming back from a detail page, so actually updating the UI after a background task

问题

I have a ListView with some stuff in and that List has some images that I load in a background task. But when I login and see the LIstview the images are not shown if I go to a detail page from one of my ListViewItems and come back the images are shown.

This is my "async" task:

 private async void DownloadImage(ImageObject imageObject)
    {
        ImageByte = await _IDataService.GetImage(imageObject.Id);

        ImageObjectImageSource = await LoadImageAsync(ImageByte);

        imageObject.ImageObjectSource = ImageObjectImageSource;
    }

来源：https://stackoverflow.com/questions/34244838/images-downloaded-in-a-async-method-shown-after-coming-back-from-a-detail-page