Blazor Virtualize for endless scrolling example in Microsoft documents are outdated and no example on internet [closed]

I tried second example here https://learn.microsoft.com/en-us/aspnet/core/blazor/components/virtualization?view=aspnetcore-9.0

I tried to implement endless scrolling using native Blazor, without javascript or other libraries.

<Virtualize ItemsProvider="itemsProvider" OverscanCount="10" Context="cxt">

ItemsProvider demands an ItemsProviderDelegate, I declared one and the context, cxt I'm using to acceses itemsProvider.Name as cxt.Name and etc...

ItemsProviderDelegate<ProductDto>? itemsProvider;

As I scroll the Virtualize I want at the end of the scroll or before at the middle to trigger an LoadVisibleProducts a function to load more products. The outdated examples of 4 years ago on the internet are not working, documentation is outdated. The function:

    private async ValueTask<ItemsProviderResult<ProductDto>> LoadVisibleProducts(ItemsProviderRequest request){        var magar = await ProductApi.GetProductsAsync1(request.StartIndex, request.Count);        foreach (var cartItem in CartService.Items)        {        var product = magar.FirstOrDefault(p => p.Id == cartItem.ProductId);            if (product != null)            {                product.Quantity = cartItem.Quantity;            }        }    return new ItemsProviderResult<ProductDto>(magar, magar.Length);}

I override OnInitialized and call the function like this

itemsProvider = request => LoadVisibleProducts(request);

I used breakpoints inside the function LoadVisibleProducts. It doesn't enter there.

How should I call the function? Is the intended usage still possible? If the question is not clear and the source code is needed I'll provide it in 12h, I worked for 10h, and I need to sleep!