ProjectLib/ProjectLibrary/Forms/FBook.cs

using ProjectLibrary.Entities;
using ProjectLibrary.Entities.Enums;
using ProjectLibrary.Repositores;
using ProjectLibrary.Repositories;

namespace ProjectLibrary.Forms
{
    public partial class FBook : Form
    {
        private readonly IBookRepository _bookRepository;
        private int? _bookId;

        public int Id
        {
            set
            {
                try
                {
                    var book = _bookRepository.ReadBookById(value);
                    if (book == null)
                    {
                        throw new InvalidOperationException("Книга не найдена.");
                    }

                    txtAuthor.Text = book.Author;
                    txtName.Text = book.Name;
                    //checkedListBox1.SelectedItem = book.TypeBookID;
                    char[] listInd = Convert.ToString((int)book.TypeBookID, 2).ToCharArray();
                    for (int i = 0; i < listInd.Length; i++)
                    {
                        checkedListBox1.SetItemChecked(i, listInd[i]=='1');
                    }
                    _bookId = value;
                    
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message, "Ошибка при загрузке данных", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }
        }

        public FBook(IBookRepository bookRepository)
        {
            InitializeComponent();
            _bookRepository = bookRepository ?? throw new ArgumentNullException(nameof(bookRepository));
            foreach(var elem in Enum.GetValues(typeof(BookType)))
            {
                if (!elem.Equals(BookType.None)) checkedListBox1.Items.Add(elem);
            }
        }

        private void btnSave_Click(object sender, EventArgs e)
        {
            try
            {
                if (string.IsNullOrWhiteSpace(txtAuthor.Text) || string.IsNullOrWhiteSpace(txtName.Text))
                {
                    throw new Exception("Имеются незаполненные поля.");
                }

                if (_bookId.HasValue)
                {
                    _bookRepository.UpdateBook(CreateBook(_bookId.Value));
                }
                else
                {
                    _bookRepository.CreateBook(CreateBook(0));
                }

                Close();

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Ошибка при сохранении данных", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private Book CreateBook(int bookId)
        {
            BookType selectedType = BookType.None;

            foreach (var item in checkedListBox1.CheckedItems)
            {
                if (item is BookType type)
                {
                    selectedType |= type; // Это должно работать, если тип является BookType
                }
            }

            return Book.CreateEntity(bookId, txtAuthor.Text, txtName.Text, selectedType);
        }



        private void ButtonCancel_Click(object sender, EventArgs e)
        {
            Close();
        }
    }
}