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>();
        private List<EventPresenter> dataSourceEvent;
        private bool isAscending = true; // Флаг для сортировки

        public MainWindow()
        {
            InitializeComponent();

            using var context = new User15Context();

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

            
            EventListBox.ItemsSource = events;
            
            ApplySortingAndFiltering();
        }

        private void ApplySortingAndFiltering()
        {
            var temp = dataSourceEvent;

            
            if (DateComboBox.SelectedItem is DateTime selectedDateTime)
            {
                temp = temp.Where(it => it.Date.Date == selectedDateTime.Date).ToList();
            }

            
            temp = isAscending ? temp.OrderBy(it => it.Date).ToList() : temp.OrderByDescending(it => it.Date).ToList();

            
            events.Clear();
            foreach (var item in temp)
            {
                events.Add(item);
            }
        }

        public class EventPresenter : Event
        {
            public Bitmap? Image
            {
                get
                {
                    try
                    {
                        string absolutePath = Path.Combine(AppContext.BaseDirectory, Photo);
                        return File.Exists(absolutePath) ? new Bitmap(absolutePath) : null;
                    }
                    catch
                    {
                        return null;
                    }
                }
            }
        }

        
        private void DateComboBox_SelectionChanged(object? sender, SelectionChangedEventArgs e)
        {
            
            isAscending = !isAscending;
            ApplySortingAndFiltering();
        }

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