Demka_kur/MainWindow.axaml.cs

using Avalonia.Controls;
using Avalonia.Interactivity;
using Demka_Snova_1.Hardik.Conect;
using Demka_Snova_1.OknaRoley;
using Microsoft.EntityFrameworkCore;
using System.Threading.Tasks;

namespace Demka_Snova_1;

public partial class MainWindow : Window
{
    private bool _isPasswordVisible = false;

    public MainWindow()
    {
        InitializeComponent();
    }

    private void TogglePasswordButton_Click(object sender, RoutedEventArgs e)
    {
        _isPasswordVisible = !_isPasswordVisible;
        PasswordTextBox.PasswordChar = _isPasswordVisible ? '\0' : '*';
    }

    private void SelerTest_Click(object sender, RoutedEventArgs e)
    {
        var login = new AdminWindow();
        login.Show();
        this.Close();
    }

    private async void LoginButton_Click(object sender, RoutedEventArgs e)
    {
        string username = UsernameTextBox.Text;
        string password = PasswordTextBox.Text;

        using (var context = new AppDbContext())
        {
            var user = await context.sotrudnik
                .FirstOrDefaultAsync(u => u.Login == username && u.Pass == password);

            if (user != null)
            {
                Window nextWindow = null;
                switch (user.Pozition)
                {
                    case "Продавец":
                        nextWindow = new SellerWindow();
                        break;
                    case "Старший смены":
                        nextWindow = new StarshiyWindow();
                        break;
                    case "Администратор":
                        nextWindow = new AdminWindow();
                        break;
                    default:
                        await ShowError("Неизвестная роль пользователя");
                        return;
                }

                nextWindow.Show();
                this.Close();
            }
            else
            {
                await ShowError("Неверный логин или пароль");
            }
        }
    }

    private async Task ShowError(string message)
    {
        var dialog = new Window
        {
            Title = "Ошибка",
            Content = message,
            Width = 300,
            Height = 200
        };
        await dialog.ShowDialog(this);
    }
}