KuzinRkisPattern/RKISPATTERN/ViewModels/MainWindowViewModel.cs

using RKISPATTERN.Command;
using RKISPATTERN.Helpers;
using RKISPATTERN.Models;
using RKISPATTERN.View;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;

namespace RKISPATTERN.ViewModels
{
    class MainWindowViewModel : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler? PropertyChanged;
        public void OnPropertyChanged([CallerMemberName] string prop = "")
        {
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs(prop));
        }
        string currentUserLogin;

        public string CurrentUserLogin
        {
            get { return currentUserLogin; }
            set
            {
                currentUserLogin = value;
                OnPropertyChanged("CurrentUserLogin");
            }
        }
        public static User CurrentUser {get;set;}
        private RelayCommand logUser;
        public RelayCommand LogUser
        {
            get 
            {
                return logUser ??
                (logUser = new RelayCommand(obj =>
                { 
                    PasswordBox pb = (PasswordBox)obj;
                    using (DBContext db = new DBContext())
                    {
                        User user = db.User.FirstOrDefault(el=>el.Login==currentUserLogin && el.Password==pb.Password);
                        if(user != null)
                        {
                            CurrentUser = user;
                            MainMenu menu = new MainMenu();
                            menu.Show();
                            Helper.CloseWindow<MainWindow>();
                        }
                        else
                        {
                            MessageBox.Show("Пользователь не найден!");
                        }
                    }
                }));
            }
        }
        private RelayCommand showRegWindow;
        public RelayCommand ShowRegWindow
        {
            get
            {
                return showRegWindow ??
                (showRegWindow = new RelayCommand(obj =>
                {                
                        Registration reg = new Registration();
                        reg.Show();
                        Helper.CloseWindow<MainWindow>();
                }));
            }
        }
    }
}