ProjectLib/ProjectLibrary/Forms/FLibrary.cs

using ProjectLibrary.Entites;
using ProjectLibrary.Repositores;
using ProjectLibrary.Repositories;
using ProjectLibrary.Repositories.Implementations;
using System.Windows.Forms;


namespace ProjectLibrary.Forms
{
    public partial class FLibrary : Form
    {
        private readonly ILibraryRepository _libraryRepository;
        private int? _orderId;
        public int Id
        {
            set
            {
                try
                {
                    var library = _libraryRepository.ReadLibraryById(value);
                    if (library == null)
                    {
                        throw new InvalidOperationException("Заказ не найден.");
                    }

                    txtName.Text = library.Name;
                    txtAddress.Text = library.Address;
                    dataGridView.DataSource = library.BookLibrary;
                    _orderId = value;
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message, "Ошибка при загрузке данных", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }
        }

        public FLibrary(ILibraryRepository libraryRepository, IBookRepository bookRepository)
        {
            InitializeComponent();
            _libraryRepository = libraryRepository ?? throw new ArgumentNullException(nameof(libraryRepository));

            Book.DataSource = bookRepository.ReadBooks();
            Book.DisplayMember = "Name";
            Book.ValueMember = "Id";
        }

        private void ButtonSave_Click(object sender, EventArgs e)
        {
            try
            {
                if (string.IsNullOrWhiteSpace(txtName.Text) || string.IsNullOrWhiteSpace(txtAddress.Text))
                {
                    throw new Exception("Не все поля заполнены.");
                }

                var library = Library.CreateEntity(
                    _orderId ?? 0,
                    txtName.Text,
                    txtAddress.Text,
                    CreateListBooksFromDataGrid()
                );

                if (_orderId.HasValue)
                {
                    _libraryRepository.UpdateLibrary(library);
                }
                else
                {
                    _libraryRepository.CreateLibrary(library);
                }
                Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Ошибка при сохранении данных", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void buttonCancel_Click_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private List<Book_Library> CreateListBooksFromDataGrid()
        {
            var list = new List<Book_Library>();
            foreach (DataGridViewRow row in dataGridView.Rows)
            {
                if (row.Cells["Book"].Value == null || row.Cells["Count"].Value == null)
                {
                    continue;
                }
                list.Add(Book_Library.CreateEntity(0, Convert.ToInt32(row.Cells["ColumnBook"].Value), Convert.ToInt32(row.Cells["ColumnCount"].Value)));
            }
            return list;
        }
    }
}