Cafe/Cafe2/AddWindows/AddEmployeeWindow.xaml.cs

using System;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Text.RegularExpressions;

namespace Cafe.AddWindows
{
    public partial class AddEmployeeWindow : Window
    {
        public AddEmployeeWindow()
        {
            InitializeComponent();
            RoleBox.ItemsSource = Connection.db.Roles.Select(item => item.RoleName).ToList();
        }

        private void RegistrationClick(object sender, RoutedEventArgs e)
        {


            bool regRes = RegistrationValidation(Login.Text.ToString(), Password.Password.ToString(), FirstName.Text.ToString(),
                                        SecondName.Text.ToString(), MiddleName.Text.ToString(), Email.Text.ToString(), 
                                        RoleBox.SelectedItem.ToString());

            if (regRes)
            {
                int roleID = GetRoleID(RoleBox.SelectedItem.ToString());

                Users user = new Users()
                {
                    Login = Login.Text,
                    Password = Encrypt.Hash(Password.Password),
                    SecondName = SecondName.Text,
                    FirstName = FirstName.Text,
                    Email = Email.Text,
                    IDRole = roleID,
                    IsFired = false
                };

                if (MiddleName.Text != "")
                {
                    user.MiddleName = MiddleName.Text;
                }

                Connection.db.Users.Add(user);
                Connection.db.SaveChanges();

                MainWindow mainWindow = new MainWindow();
                mainWindow.Show();
                this.Close();
            }
        }

        public bool RegistrationValidation(string login, string password, string Fname, string Sname, string Mname, string email, string roleName)
        {
            if (login == "" || password == "" || Fname == "" || Sname == "" || email == "" || roleName == "")
            {
                ErrorWindow errorWindow = new ErrorWindow("пустые поля");
                errorWindow.Show();
                return false;
            }
            if (UserLoginIsExist(login))
            {
                ErrorWindow errorWindow = new ErrorWindow("такой пользователь уже существует");
                errorWindow.Show();
                return false;
            }
            if (!IsValidEmail(email))
            {
                ErrorWindow errorWindow = new ErrorWindow("неверный формат почты");
                errorWindow.Show();
                return false;
            }

            return true;
        }

        public bool UserLoginIsExist(string login)
        {
            return Connection.db.Users.Select(item => item.Login).Contains(login);
        }

        public int GetRoleID(string roleName)
        {
            return Connection.db.Roles.Where(item => item.RoleName == roleName).Select(item => item.ID).FirstOrDefault();
        }

        public bool IsValidEmail(string email)
        {
            string regex = @"^([\w\.\-]+)@([\w\-]+)((\.(\w){2,3})+)$";
            if (Regex.IsMatch(email, regex))
                return true;
            else
                return false;
        }

        private void BackButtonClick(object sender, RoutedEventArgs e)
        {
            MainWindow mainWindow = new MainWindow();
            mainWindow.Show();
            this.Close();
        }

        private void TextChanged(object sender, TextChangedEventArgs e)
        {
            if (Regex.IsMatch((((TextBox)sender).Text).ToString(), "[^А-я-:]"))
            {
                ((TextBox)sender).Text = ((TextBox)sender).Text.Remove(((TextBox)sender).Text.Length - 1);
                ((TextBox)sender).SelectionStart = ((TextBox)sender).Text.Length;
            }
        }
    }
}