WPF ListBox ItemTemplate DataTemplate Image

//xaml
<Window x:Class="WpfApp153.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp153"
        WindowState="Maximized"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <ListBox ItemsSource="{Binding ImgSourceList,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <Image Source="{Binding}"
                           Stretch="Uniform"
                           Width="{Binding ActualWidth,RelativeSource={RelativeSource Mode=FindAncestor,
                        AncestorType={x:Type Window}}}"
                           Height="{Binding ActualHeight,RelativeSource={RelativeSource Mode=FindAncestor,
                        AncestorType={x:Type Window}}}"/>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
    </Grid>
</Window>




//cs
using System.ComponentModel;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.IO;
using System.Collections.ObjectModel;

namespace WpfApp153
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window, INotifyPropertyChanged
    {
        public MainWindow()
        {
            InitializeComponent();
            this.DataContext = this;
            InitData();
        }

        private void InitData()
        {
            var imgs = Directory.GetFiles(@"../../../Images");
            
            foreach (var img in imgs)
            {
                BitmapImage bmp = new BitmapImage();
                bmp.BeginInit();
                bmp.UriSource = new Uri(img,UriKind.RelativeOrAbsolute);
                bmp.EndInit();
                if(bmp.CanFreeze)
                {
                    bmp.Freeze();
                }
                ImgSourceList.Add(bmp);
            } 
        }

        public event PropertyChangedEventHandler? PropertyChanged;
        private void OnPropertyChanged(string propertyName)
        {
            var handler = PropertyChanged;
            if(handler!=null)
            {
                handler?.Invoke(this, new PropertyChangedEventArgs(propertyName));
            }
        }

        private ObservableCollection<ImageSource> imgSourceList;
        public ObservableCollection<ImageSource> ImgSourceList
        {
            get
            {
                return imgSourceList==null?imgSourceList=new ObservableCollection<ImageSource>():imgSourceList;
            }
            set
            {
                if(value!= imgSourceList)
                {
                    imgSourceList = value;
                    OnPropertyChanged(nameof(ImgSourceList));
                }
            }
        }
    }
}