avaloniax/AvaloniaHomeTry/ViewModels/UserPageViewModel.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Avalonia.Controls.ApplicationLifetimes;
using System.Threading.Tasks;
using Avalonia.Media.Imaging;
using Avalonia.Platform.Storage;
using AvaloniaHomeTry.Models;
using Microsoft.EntityFrameworkCore;
using ReactiveUI;
using Avalonia;

namespace AvaloniaHomeTry.ViewModels
{
	public class UserPageViewModel : ViewModelBase
	{
		UsersTable? currentUser;

        Bitmap? userImage;

        List<UsersTable> mainUsers;

        List<UsersTable> secondUsers;


        public UsersTable? CurrentUser { get => currentUser; set => this.RaiseAndSetIfChanged(ref currentUser, value); }

        public Bitmap? UserImage { get => userImage; set => this.RaiseAndSetIfChanged(ref userImage, value); }

        public UserPageViewModel(int idUser)
		{

			currentUser = db.UsersTable.Include(x => x.GenderNavigation).Include(x => x.RoleNavigation).FirstOrDefault(x => x.Id == idUser);
            UserImage = CurrentUser.Image != null ? new Bitmap(new MemoryStream(CurrentUser.Image)) : new Bitmap("D:\\avaloniax\\AvaloniaHomeTry\\Assets\\background.jpg");
        }

		public List<string> Genders => db.Genders.Select(x => x.GenderName).ToList();

		public string GenderIndex { get => currentUser.GenderNavigation.GenderName; set => currentUser.IdGender = db.Genders.FirstOrDefault(x => x.GenderName == value).Id; }

		public string DR { get => currentUser.Dataofbirth.ToString(); set => currentUser.Dataofbirth = DateTime.Parse(value); }
        public List<UsersTable> MainUsers { get => mainUsers; set => this.RaiseAndSetIfChanged(ref mainUsers,value); }
        public List<UsersTable> SecondUsers { get => secondUsers; set => this.RaiseAndSetIfChanged(ref secondUsers, value); }

        public void SaveData() => db.SaveChanges();


      

        public void ExitProfile()
		{

			if (currentUser.IdRole == 1)
			{
				MainWindowViewModel.Self.UC = new AdminPage();
			}
			else
			{
				MainWindowViewModel.Self.UC = new AuthPage();
			}

		}

        public async Task Image(int id)
        {
            if (Application.Current?.ApplicationLifetime is not IClassicDesktopStyleApplicationLifetime desktop ||
                desktop.MainWindow?.StorageProvider is not { } provider)
                throw new NullReferenceException("Missing StorageProvider instance.");
            {
                var files = await provider.OpenFilePickerAsync(new FilePickerOpenOptions()
                {
                    Title = "Âûáèðèòå ôàéë ñ èçîáðàæåíèåì: ",
                    AllowMultiple = false
                });

                await using var readStream = await files[0].OpenReadAsync();
                byte[] buffer = new byte[10000000];
                var bytes = readStream.ReadAtLeast(buffer, 1);
                Array.Resize(ref buffer, bytes);
                currentUser = db.UsersTable.FirstOrDefault(x => x.Id == id);
                currentUser.Image = buffer;
                UserImage = new Bitmap(new MemoryStream(currentUser.Image));
                db.SaveChanges();
                SecondUsers = db.UsersTable.ToList();
                MainUsers = SecondUsers;

            }
        }


    }
}