Brtdku

I have a ListView in my UWP app.

This is my code:

<ListView x:Name="viewMedias" SelectionMode="None" VirtualizingStackPanel.VirtualizationMode="Recycling" ScrollViewer.HorizontalScrollMode="Disabled" ScrollViewer.VerticalScrollMode="Auto">

        ......

</ListView>

Now, how can I receive an event when this ListView scrolls to nearly end? I want to Update ItemsSource to add new Items to bottom of the ListView.

Welcome to StackOverflow!
What you want to achieve is called Incremental Loading. You don't have to implement it by your self - just check existing solutions.
Windows Community Toolkit has IncrementalLoadingCollection helpers that can help you. You can check demo in their sample app: Windows Community Toolkit Sample App in Windows Store (go to helpers > Incremental Loading Collection). Here is some sample code from this app:

// Defines a data source whose data can be loaded incrementally.

using Microsoft.Toolkit.Uwp;



public class Person

{

    public string Name { get; set; }

}



public class PeopleSource : IIncrementalSource<Person>

{

    private readonly List<Person> _people;



    public PeopleSource()

    {

        // Creates an example collection.

        _people = new List<Person>();



        for (int i = 1; i <= 200; i++)

        {

            var p = new Person { Name = "Person " + i };

            _people.Add(p);

        }

    }



    public async Task<IEnumerable<Person>> GetPagedItemsAsync(int pageIndex, int pageSize)

    {

        // Gets items from the collection according to pageIndex and pageSize parameters.

        var result = (from p in _people

                      select p).Skip(pageIndex * pageSize).Take(pageSize);



        // Simulates a longer request...

        await Task.Delay(1000);



        return result;

    }

}



// IncrementalLoadingCollection can be bound to a GridView or a ListView. In this case it is a ListView called PeopleListView.



var collection = new IncrementalLoadingCollection<PeopleSource, Person>();



PeopleListView.ItemsSource = collection;



// Binds the collection to the page DataContext in order to use its IsLoading and HasMoreItems properties.

DataContext = collection;



// XAML UI Element

<TextBlock Text="{Binding IsLoading, Converter={StaticResource StringFormatConverter}, ConverterParameter='Is Loading: {0}'}" />

<TextBlock Text="{Binding HasMoreItems, Converter={StaticResource StringFormatConverter}, ConverterParameter='Has More Items: {0}'}" />