eCompanies/eCompanies/MainWindow.xaml.cs

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace eCompanies
{
    /// <summary>
    /// Логика взаимодействия для MainWindow.xaml
    /// </summary>
    public delegate void UpdateCompanyGridDelegate(Company updatingCompany);
    public partial class MainWindow : Window
    {
        List<int> deletingCompanyList = new List<int>();
        List<int> updatingCompanyList = new List<int>();
        UsersWindow usersWindowInstance = null;

        public MainWindow()
        {
            InitializeComponent();
            companyGrid.DataContext = App.getCompanies();
        }
        
        private void updateCompanyItem(Company updatingCompany)
        {
            if (updatingCompany == null) return;
            updatingCompanyList.Add(updatingCompany.CompanyId);
            var context = ((ObservableCollection<Company>)companyGrid.DataContext).ToList<Company>();
            for (int i = 0; i < context.Count; i++)
            { 
                if (context[i].CompanyId.Equals(updatingCompany.CompanyId))
                {
                    context[i] = updatingCompany;
                    companyGrid.DataContext = new ObservableCollection<Company>(context);
                    updatingCompanyList.Add(updatingCompany.CompanyId);
                    return;
                }
            }
        }
        

        private void RowEdit_Click(object sender, RoutedEventArgs e)
        {
            UpdateCompanyGridDelegate d = updateCompanyItem;
            Company company = (Company)companyGrid.CurrentItem;
            if (usersWindowInstance != null) usersWindowInstance.Close();
            usersWindowInstance = new UsersWindow(company, d);
            usersWindowInstance.Show();
        }

        private void RowDelete_Click(object sender, RoutedEventArgs e)
        {
            deleteCompanyFromGrid();
        }

        private void deleteCompanyFromGrid()
        {
            var companies = (ObservableCollection<Company>)companyGrid.DataContext;
            foreach (Company c in companies)
            {
                int deletingUser = ((Company)companyGrid.CurrentItem).CompanyId;
                if (Equals(c.CompanyId, deletingUser))
                {
                    deletingCompanyList.Add(((Company)companyGrid.CurrentItem).CompanyId);
                    companies.Remove(c);
                    companyGrid.DataContext = companies;
                    return;
                }
            }
        }

        private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
        {

            MessageBoxResult mbr = MessageBox.Show("Вы закрываете приложение. Хотите сохранить результаты?", "Сохранение изменений", MessageBoxButton.YesNo);
            if (mbr == MessageBoxResult.No)
                return;
            foreach (Company c in (ObservableCollection<Company>)companyGrid.DataContext)
            {
                if (c.Name == null)
                {
                    mbr = MessageBox.Show("Вы не заполнили поле [Название компании]! " +
                        "Вернуться к форме для исправления? (При ответе Нет все данные будут потеряны!)",
                        "Поле [Название компании] не может быть пустым!",
                        MessageBoxButton.YesNo);

                    if (mbr == MessageBoxResult.Yes)
                    {
                        e.Cancel = true;
                        return;
                    }
                    else if (mbr == MessageBoxResult.No)
                        return;
                }

                if (deletingCompanyList != null)
                    App.removeCompany(deletingCompanyList);
                deletingCompanyList = null;
                // TODO: реализация обновления старых компаний и добавления новых
            }

        }
    }
}