kursovaya/AdminWindow.axaml.cs

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

namespace kursovaya;

public partial class AdminWindow : Window
{
    List<Discipline> Disciplines = new List<Discipline>();
    List<Group> Groups = new List<Group>();
    List<Teacher> Teachers = new List<Teacher>();
    ObservableCollection<DisciplineGroupTeacher> DisciplineGroupTeachers = new ObservableCollection<DisciplineGroupTeacher>();
    public AdminWindow()
    {
        InitializeComponent();
        
        var ctx = new DatabaseContext();

        Disciplines = ctx.Disciplines.ToList();
        Groups = ctx.Groups.ToList();
        Teachers = ctx.Teachers.ToList();

        var disciplineTeachers = ctx.DisciplineTeachers.ToList();

        foreach (DisciplineTeacher disciplineTeacher in disciplineTeachers)
        {
            var teacher = ctx.Teachers.FirstOrDefault(t => t.Id == disciplineTeacher.IdTeacher);
            var discipline = ctx.Disciplines.FirstOrDefault(d => d.Id == disciplineTeacher.IdDiscipline);
            var groups = ctx.Groups.Where(g => ctx.Attestations.Any(at => ctx.Students.Any(s => s.Id == at.IdUser && s.IdGroup == g.Id) && at.IdDiscipline == discipline.Id));
            foreach (Group group in groups)
            {
                DisciplineGroupTeachers.Add(new DisciplineGroupTeacher(){Teacher = teacher, Discipline = discipline, Group = group});
            }
        }
        
        MultComboBox.ItemsSource = DisciplineGroupTeachers.Select(dg => dg.NameComboBox).ToList();
        FlatGrid.ItemsSource = DisciplineGroupTeachers;

    }

    public class DisciplineGroupTeacher()
    {
        public Group Group { get; set; }
        public Discipline Discipline { get; set; }
        public Teacher Teacher { get; set; }
        public string DisciplineName
        {
            get => Discipline.Name;
        }
        public int GroupId
        {
            get => Group.Id;
        }
        public string TeacherFio
        {
            get => Teacher.Fio;
        }
        public string NameComboBox
        {
            get
            {
                return $"{Discipline.Name} - {Group.Id} - {Teacher.Fio}";
            }
        }
    }
    
    public void Display()
    {
        if (MultComboBox.SelectionBoxItem != null)
        {
            var selectedDiscGroupTeacher = DisciplineGroupTeachers.FirstOrDefault(dg => dg.NameComboBox == MultComboBox.SelectedItem.ToString());
            var filteredData = DisciplineGroupTeachers.Where(dg => dg.Discipline.Name == selectedDiscGroupTeacher.Discipline.Name && dg.Group.Id == selectedDiscGroupTeacher.Group.Id && dg.Teacher.Fio == selectedDiscGroupTeacher.Teacher.Fio).ToList();
            FlatGrid.ItemsSource = filteredData;
        }
    }
    
    private void ButtonBack_OnClick(object? sender, RoutedEventArgs e)
    {
        Close();
    }

    private void ButtonCheck_OnClick(object? sender, RoutedEventArgs e)
    {
        Display();
    }

    private void ButtonCheckGroups_OnClick(object? sender, RoutedEventArgs e)
    {
        GroupsFromAdminWindow groupsFromAdminWindow = new GroupsFromAdminWindow();
        groupsFromAdminWindow.ShowDialog(this);
    }
    
    private void ButtonCheckStudents_OnClick(object? sender, RoutedEventArgs e)
    {
        StudentsFromAdminWindow studentsFromAdminWindow = new StudentsFromAdminWindow();
        studentsFromAdminWindow.ShowDialog(this);
    }
    
    private async void ButtonCheckTeachers_OnClick(object? sender, RoutedEventArgs e)
    {
        // TeachersFromAdminWindow teachersFromAdminWindow = new TeachersFromAdminWindow();
        // teachersFromAdminWindow.ShowDialog(this);
        
        TeachersFromAdminWindow teachersFromAdminWindow = new TeachersFromAdminWindow();
        var result = await teachersFromAdminWindow.ShowDialog<Boolean>(this);
        if (result == true)
        {
            Display();
        }
    }
    
    private void ButtonCheckDiscipline_OnClick(object? sender, RoutedEventArgs e)
    {
        AddDiscipline addDiscipline = new AddDiscipline();
        addDiscipline.ShowDialog(this);
    }
}