eCompanies/eCompanies/MainWindow.xaml.cs

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Windows;
using System.Windows.Controls;

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

        public MainWindow()
        {
            InitializeComponent();
            companyGrid.DataContext = App.getCompanies();
        }
        
        private void updateCompanyItem(Company updatingCompany)
        {
            if (updatingCompany == null) return;
            updatingCompany.needUpdate = true;
        }
        

        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 окно с компаниями. Хотите сохранить результаты?", "Сохранение изменений", MessageBoxButton.YesNoCancel);
            switch (mbr)
            {
                case MessageBoxResult.No: return;
                case MessageBoxResult.Cancel:
                    e.Cancel = true;
                    break;
            }
            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 (c.CompanyId == 0)
                    App.addCompany(c);
                else if (c.needUpdate)
                    App.updateCompany(c);
            }
            if (deletingCompanyList != null)
                App.removeCompany(deletingCompanyList);
        }

        private void companyGrid_CellEditEnding(object sender, DataGridCellEditEndingEventArgs e)
        {
            ((Company)e.Row.Item).needUpdate = true;
        }
    }
}