RKIS/Task1/ViewModel/RegWindowVM.cs

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Task1.ViewModel
{
    class RegWindowVM : BaseViewModel
    {
        private ObservableCollection<User> _users;
        private User _user;
        private RelayCommand _otmena;
        private RelayCommand _reg;

        public RelayCommand Reg
        {
            get
            {
                return _reg ?? (_reg = new RelayCommand((x) =>
                    {
                        TaskContext taskContext = new TaskContext();
                        User user = User;
                        taskContext.Users.Add(user);
                        taskContext.SaveChanges();
                        User = null;
                        new MainWindow().Show();
                        Helper.CloseWindowsAtType<RegWindow>();
                    }));
            }
        }

        
        public RelayCommand Otmena
        {
            get
            {
                return  _otmena ??
                (_otmena = new RelayCommand((x) =>
                {
                    new MainWindow().Show();
                    Helper.CloseWindowsAtType<RegWindow>();
                }));
            }
        }
        public ObservableCollection<User> Users
        {
            get => _users;
            set
            {
                _users = value;
                OnPropertyChanged();
            }
        }

        public User User
        {
            get => _user;
            set
            {
                _user = value;
                OnPropertyChanged();
            }
        }
        public RegWindowVM()
        {
            TaskContext taskContext = new TaskContext();
            _users = new ObservableCollection<User>(taskContext.Users);
            _user = new User();
        }

    }
}