ListViewExSample/ListViewEx.cs

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using System;
using System.ComponentModel;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Threading.Tasks;
using Windows.Foundation;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Media;

namespace ListViewExSample
{
    public class ListViewEx : ListView, INotifyPropertyChanged
    {
        private ScrollViewer _scrollViewer;
                
        private Visibility _goBottomVisiblity = Visibility.Collapsed;

        public Visibility GoBottomVisiblity
        {
            get { return _goBottomVisiblity; }
            set
            {
                _goBottomVisiblity = value;
                this.OnProperyChanged();
            }
        }


        public event EventHandler LoadHistoryEvent;
        public event PropertyChangedEventHandler PropertyChanged;

        protected void OnProperyChanged([CallerMemberName] string name = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
        }

        public ListViewEx()
        {
            this.Loaded += ListViewEx_Loaded;
            this.Unloaded += ListViewEx_Unloaded;
        }

        private void ListViewEx_Unloaded(object sender, RoutedEventArgs e)
        {
            this.Unloaded -= ListViewEx_Unloaded;
            if (_scrollViewer != null)
            {
                _scrollViewer.ViewChanged -= Sv_ViewChanged;
                _scrollViewer.ViewChanged -= Sv_ViewChanged2;
            }
        }

        private void ListViewEx_Loaded(object sender, Windows.UI.Xaml.RoutedEventArgs e)
        {
            this.Loaded -= ListViewEx_Loaded;
            _scrollViewer = FindFirstChild<ScrollViewer>(this);
            if (_scrollViewer != null)
            {
                _scrollViewer.ViewChanged += Sv_ViewChanged;