kursovaya/AddStudent.axaml.cs

using System.Collections.Generic;
using System.Linq;
using Avalonia;
using Avalonia.Controls;
using Avalonia.Interactivity;
using Avalonia.Markup.Xaml;
using kursovaya.Models;

namespace kursovaya;

public partial class AddStudent : Window
{
    List<Group> _groups = new List<Group>();
    Group group = new Group();
    
    List<Student> students = new List<Student>();
    Student student = new Student();
    
    User user = new User();
    public AddStudent()
    {
        InitializeComponent();
        using var ctx = new DatabaseContext();
        
        _groups = ctx.Groups.ToList();
        
        GroupsComboBox.ItemsSource = _groups.Select(g => g.Id).ToList();
    }

    private void ButtonAdd_OnClick(object? sender, RoutedEventArgs e)
    {
        if (GroupsComboBox.SelectedItem == null || 
            string.IsNullOrWhiteSpace(FioTextBox?.Text))
        {
            ErrorMessage.Text = "Поля не должны быть пустыми!";
            return;
        }
        
        var fio = FioTextBox.Text;
        var selectedGroupId = (int)GroupsComboBox.SelectedItem;

        var ctx = new DatabaseContext();
        
        int lastUserId = ctx.Users.Max(u => u.Id);
        
        user = new User() {Id = lastUserId+1, Login = $"user{lastUserId+1}", Password = "qwerty", Email = $"user{lastUserId+1}@mail.ru", RoleId = 1};
        student = new Student() {Id = lastUserId+1, Fio = fio, IdGroup = selectedGroupId, Login = $"user{lastUserId+1}"};
        
        ctx.Users.Add(user);
        ctx.Students.Add(student);
        var changes = ctx.SaveChanges();
        
        if (changes > 0)
        {
            SuccessMessage.Text = "Ученик успешно добавлен!";
            if (ErrorMessage != null)
            {
                ErrorMessage.Text = "";
            }
            students.Add(student);
        }
        else
        {
            ErrorMessage.Text = "Не удалось добавить ученика.";
            SuccessMessage.Text = "";
        }
    }
    
    private void ButtonBack_OnClick(object? sender, RoutedEventArgs e)
    {
        Close(students);
    }
}