Progect/AddEditPage.xaml.cs

using System;
using System.Collections.Generic;
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;
using WpfApp1.Entities;

namespace WpfApp1
{
    /// <summary>
    /// Логика взаимодействия для AddEditPage.xaml
    /// </summary>
    public partial class AddEditPage : Page
    {
        private User _currentUser = new User();
        public AddEditPage(User selectedUser)
        {
            InitializeComponent();

            if (selectedUser != null)
                _currentUser = selectedUser;

            DataContext = _currentUser;
            _currentUser.IsDeleted = false;
        }

        private void BtnSave_Click(object sender, RoutedEventArgs e)
        {
            StringBuilder errors = new StringBuilder();
            if (string.IsNullOrWhiteSpace(_currentUser.Password)) errors.AppendLine("Укажите свой пароль!");
            if (string.IsNullOrWhiteSpace(_currentUser.FirstName))errors.AppendLine("Укажите имя!");
            if (string.IsNullOrWhiteSpace(_currentUser.MiddleName))errors.AppendLine("Укажите фамилию!");
            if (string.IsNullOrWhiteSpace(_currentUser.LastName))errors.AppendLine("Укажите отчество!");
            if (string.IsNullOrWhiteSpace(_currentUser.Login))errors.AppendLine("Укажите свой логин!");
            if (errors.Length > 0)
            {
                MessageBox.Show(errors.ToString());
                return;
            }

            if (_currentUser.ID == 0)
                user20Entities.GetContext().User.Add(_currentUser);
            try
            {
                user20Entities.GetContext().SaveChanges();
                MessageBox.Show("Данные сохранены!");
                Manager.MainFrame.GoBack();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message.ToString());
            }
        }
    }
}