YeahFishyFishy/TrainingBeforeExams/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 TrainingBeforeExams
{
    
    public partial class MainWindow : Window
    {
        testEntities entities = new testEntities();
        public User currentUser { get; set; }
        public List<int> idUsers = new List<int>();
        public ObservableCollection<User> UserCollection = new ObservableCollection<User>();
        public MainWindow()
        {
            InitializeComponent();
            usersList.ItemsSource = entities.User.ToList(); 
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            currentUser = (sender as Button).DataContext as User;
            
            if(CurrentStaff.Items.Contains(currentUser))
            {
                MessageBox.Show("Этот пользователь уже в списке!");
                return;
            }
            else
            {
                UserCollection.Add(currentUser);
                idUsers.Add(currentUser.IdUser);
                CurrentStaff.Items.Add(currentUser);
            }
        }

        private void Button_Click_1(object sender, RoutedEventArgs e)
        {
            string _numberStaff = RandomString(4);
            for (int i = 0; i < CurrentStaff.Items.Count; i++)
            {
                StaffList staff = new StaffList
                {
                    UserID = idUsers[i],
                    NumberStaff = _numberStaff
                };
                entities.StaffList.Add(staff);
            }
            entities.SaveChanges();
            MessageBox.Show("Смена создана!");
        }
        private static Random random = new Random();
        public static string RandomString(int length)
        {
            const string chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
            return new string(Enumerable.Repeat(chars, length).Select(s => s[random.Next(s.Length)]).ToArray());
        }

        private void Button_Click_2(object sender, RoutedEventArgs e)
        {
            CurrentStaff.Items.Clear();
            idUsers.Clear();
        }
    }
}