demo2023/demo_2023/MainWindow.axaml.cs

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.IO;
using System.Linq;
using Avalonia.Controls;
using Avalonia.Interactivity;
using Avalonia.Media.Imaging;
using demo_2023.Models;

namespace demo_2023
{
    public partial class MainWindow : Window
    {
        private ObservableCollection<EventPresenter> events = new ObservableCollection<EventPresenter>(); 

        public MainWindow()
        {
            InitializeComponent();

            
            using var context = new User15Context();

            var dataSourceEvent = context.Events.Select(it => new EventPresenter
            {
                Sobitie = it.Sobitie,
                Date = it.Date,
                Days = it.Days,
                City = it.City,
                Photo = it.Photo
            }).ToList();

            
            foreach (var eventItem in dataSourceEvent)
            {
                events.Add(eventItem);
            }

            
            EventListBox.ItemsSource = events;
        }

        
        public class EventPresenter : Event
        {
            public Bitmap? Image
            {
                get
                {
                    try
                    {
                        
                        string absolutePath = Path.Combine(AppContext.BaseDirectory, Photo);

                        if (File.Exists(absolutePath))
                        {
                            return new Bitmap(absolutePath); 
                        }

                        return null;
                    }
                    catch
                    {
                        return null; 
                    }
                }
            }
        }

        
        private void Jury_reg(object? sender, RoutedEventArgs e)
        {
            new Additem().ShowDialog(this);
        }
    }
}