High-performance scroll FFImageLoading Win3

[artillisprado]

I'm building a desktop application using .NET MAUI (Windows) that displays a large number of images (between 200 and 1000) in a CollectionView. However, I'm facing serious performance issues when scrolling:

When scrolling quickly, the app crashes without clear errors or logs
I've tried performance optimizations, but the CollectionView in .NET MAUI still lacks full high-performance scrolling support on desktop

I found code using ScrollStateChanged (as in WinUI 3), but it's not directly supported in .NET MAUI.

_myListView.ScrollStateChanged += (object sender, ScrollStateChangedEventArgs scrollArgs) => {
switch (scrollArgs.ScrollState)
{
case ScrollState.Fling:
ImageService.Instance.SetPauseWork(true); // all image loading requests will be silently canceled
break;
case ScrollState.Idle:
ImageService.Instance.SetPauseWork(false); // loading requests are allowed again

  // Here you should have your custom method that forces redrawing visible list items
  _myListView.ForcePdfThumbnailsRedraw();
  break;

}
};

I'd appreciate help with:

Whether there's a viable alternative to CollectionView for high-item-count scenarios

[rokmeglic71]

What if you listen on "scrolled" event at CollectionView.
Then you send a message using WeakReferenceMessenger (Send method) and add a code to listen for WeakReferenceMessenger - this type of message (Register method).

In this Register method, you add a semphare call, so if there are multiple events fired, you only check for one.
Then you use "GetVisualTreeDescendants", go trough all the items from collection view and load the image.

You have an array, when image is loaded, you enter this image to this array, so the image from array is used, instead of loading them all the time. The default image is "loading image" ... so when you scroll, you know images are loading and then when image is sucessfully loaded, you replace this image with yourImageElementinXaml.source = newImage.