AvaloniaProject/ApplicationAvalonia/ViewModels/RegestViewModel.cs

using ApplicationAvalonia.Models;
using ApplicationAvalonia.Utilities;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using Microsoft.EntityFrameworkCore;
using MsBox.Avalonia;
using MsBox.Avalonia.Enums;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace ApplicationAvalonia.ViewModels
{
    internal partial class RegestViewModel : ViewModelBase
    {
        PageSwitcher pgSwitch;

        #region Properties
        [ObservableProperty]
        private string _login = string.Empty;

        [ObservableProperty]
        private string _password = string.Empty;

        [ObservableProperty]
        private string _name = string.Empty;

        [ObservableProperty]
        private string _surname = string.Empty;

        [ObservableProperty]
        private string _message = string.Empty;
        #endregion

        public RegestViewModel(ref PageSwitcher pageSwitcher)
        {
            this.pgSwitch = pageSwitcher;
        }


        [RelayCommand]
        private async void RegistrationBtn()
        {
            Message = "";

            // AES encrypted
            if (Login.Trim() != "" && Password.Trim() != "" && Name.Trim() != "" && Surname.Trim() != "")
            {                
                byte[] key = new byte[16];
                byte[] iv = new byte[16];

                using (RandomNumberGenerator rng = RandomNumberGenerator.Create())
                {
                    rng.GetBytes(key);
                    rng.GetBytes(iv);
                }

                byte[] encryptedPassword = EncryptionClass.Encrypt(Password, key, iv);

                LoginTable newUser = new LoginTable() { Login = Login.Trim(), Password = encryptedPassword, Iv = iv, Key = key };

                dbContext.LoginTables.Add(newUser);
                dbContext.SaveChanges();

                var userInDB = dbContext.LoginTables.SingleOrDefault(x => encryptedPassword == x.Password);

                if (userInDB != null)
                {
                    UserTable userTable = new UserTable() { IdLoginNavigation = userInDB, IdLogin = userInDB.Id, UserName = Name.Trim(),
                        UserSurname = Surname.Trim(), IdRole = 2 };

                    dbContext.UserTables.Add(userTable);
                    dbContext.SaveChanges();

                    var mbox = MessageBoxManager.GetMessageBoxStandard("Уведомление", "Регистрация прошла успешно перенаправляем вас на другую страницу",
                        ButtonEnum.Ok, Icon.Success);

                    var waiter = await mbox.ShowWindowAsync();

                    pgSwitch.View = new AuthViewModel(ref pgSwitch);

                    return;
                }

                Message = "Что-то пошло не так";

            }
            else
            {
                Message = "Поля или поле не заполнены";
            }

        }


    }
}