Image disappears after page reloading

Question

I have a test program with UNO and .NET 5

Now I have a list to show the pictures that the user opened.
It works and like this:

But, if you go to another page and back to this page, every picture will not be able to show.

There are codes to set the picture.
https://github.com/Aloento/YourWaifu2x/blob/1df1c37e77e58119717dbc0154ec600b1c9097f3/YourWaifu2x.UWP/Views/GeneralPages/SelectingImages.xaml.cs#L54-L67

So, could anyone help me to figure out how to fix it?

Answer 1

Hello, Welcome to Micorosoft Q&A,

It looks local variable bitmap was released when navigate to other page, for this scenario, a quickly solution reload the file when page go back. Please copy the following code into Selecting_OnLoaded merhod

private async void Selecting_OnLoaded(object sender, RoutedEventArgs e) {  
    ImagesList.ItemsSource = imageListData;  
    imageListData.CollectionChanged += (o, args) => ImagesList_OnSelectionChanged(null, null);  
  
    if (imageListData.Count > 0) {  
        foreach (StorageFile file in imageListData) {  
            await Dispatcher.RunIdleAsync(async (_) => {  
                var items = VisualTreeHelperEx.GetDescendants(ImagesList);  
                foreach (var item in items) {  
                    if (!(item is Image image))  
                        continue;  
                    if ((string)image.Tag != file.Path)  
                        continue;  
  
                    var bit = new BitmapImage();  
                    await bit.SetSourceAsync(await file.OpenReadAsync());  
                    image.Stretch = Stretch.UniformToFill;  
                    image.Source = bit;  
                }  
            });  
        }  
    }  
  
    var addCommand = new StandardUICommand(StandardUICommandKind.Open);  
......  
}  

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