Otel/HotelCalifornia/MainWindow.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
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 System.Data.SqlClient;
using System.Data;

namespace HotelCalifornia
{
    /// <summary>
    /// Логика взаимодействия для MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();        
        }

        //Строка подключения
        SqlConnection con = new SqlConnection("Data Source=localhost;Initial Catalog=kursah;Integrated Security=True");
 
        //Перетаскивание окна
        private void Grid_MouseDown(object sender, MouseButtonEventArgs e)
        {
            DragMove();
        }

        //Выход из приложения
        private void Close(object sender, RoutedEventArgs e)
        {
            Application.Current.Shutdown();        
        }

        //Авторизация пользователя
        private void Vhod(object sender, RoutedEventArgs e)
        {
            try
            {
                if (logintxt.Text == "" || passwordtxt.Password == "")
                {
                    MessageBox.Show("Поля не могут быть пустыми!", "Предупреждение", MessageBoxButton.OK, MessageBoxImage.Information);
                }
                else
                {
                    con.Open();
                    SqlCommand cmd = new SqlCommand("Select * from Administrator where Login ='" + logintxt.Text + "'  and Password ='" + passwordtxt.Password + "'", con);
                    cmd.CommandType = CommandType.Text;
                    SqlDataAdapter adapter = new SqlDataAdapter();
                    adapter.SelectCommand = cmd;
                    DataSet dataSet = new DataSet();
                    adapter.Fill(dataSet);
                    if (dataSet.Tables[0].Rows.Count > 0)
                    {
                        Variant variant = new Variant();                    
                        string username = dataSet.Tables[0].Rows[0]["ID_Administrator"].ToString();
                        variant.idadmintxt.Text = username;
                        con.Close();
                        variant.Show();
                        this.Close();
                    }
                    else
                    {
                        con.Close();
                        MessageBox.Show("Такого Администратора нет в системе!", "Вход", MessageBoxButton.OK, MessageBoxImage.Information);
                    }
                }
            }
            catch (Exception ex)           
            {
                con.Close();
                MessageBox.Show("Возникла ошибка! " + ex.ToString(),"Ошибка",MessageBoxButton.OK, MessageBoxImage.Error);
            }       
        }

        //Ограничение для ввода текста
        #region Ограничения
        //Запрет пробела
        private void logintxt_PreviewKeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Space)
            {
                e.Handled = true;
            }
        }

        //Запрет пробела
        private void passwordtxt_PreviewKeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Space)
            {
                e.Handled = true;
            }
        }

        //Определенные символы
        private void logintxt_TextChanged(object sender, TextChangedEventArgs e)
        {
            if (sender is TextBox textBox)
            {
                textBox.Text = new string
               (textBox.Text.Where(ch => (ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z') || (ch >= '0' && ch <= '9')).ToArray());
            }
        }

        //Определенные символы
        private void passwordtxt_PreviewTextInput(object sender, TextCompositionEventArgs e)
        {
            bool a = new Regex("[^A-Z]+").IsMatch(e.Text);
            bool b = new Regex("[^a-z]+").IsMatch(e.Text);
            bool c = new Regex("[^0-9]+").IsMatch(e.Text);
            e.Handled = a && b && c;
        }
        #endregion

        //Свернуть окно
        private void WindMin_Click(object sender, RoutedEventArgs e)
        {
            this.WindowState = WindowState.Minimized;
        }
    }
}