AvalonaTeachersProject/AvaloniaTeachersDB/ViewModels/MainWindowViewModel.cs

using Avalonia.Controls;
using AvaloniaTeachersDB.Models;
using AvaloniaTeachersDB.Views;
using Microsoft.EntityFrameworkCore;
using ReactiveUI;
using System.Collections.Generic;
using System.Data;
using System.Linq;

namespace AvaloniaTeachersDB.ViewModels
{
    public class MainWindowViewModel : ViewModelBase
    {
        UserControl _us = new PersonalInformation();

        PersonalInformationViewModel _personInf = new PersonalInformationViewModel();
        AddTeacherViewModel _addTeacher = new AddTeacherViewModel();


        public UserControl US
        {
            get => _us;
            set => this.RaiseAndSetIfChanged(ref _us, value);
        }

        public PersonalInformationViewModel PersonInf
        { 
            get => _personInf; 
            set => _personInf = value; 
        }
        public AddTeacherViewModel AddTeacher
        {
            get => _addTeacher;
            set => _addTeacher = value;
        }

        public void ToAdd()
        {            
            US = new AddTeacher();
        }
        public void ToPersInf()
        {           
            US = new PersonalInformation();
            AddTeacher.CollSubSelect.Clear();
        }
        public void ToAddNewTeacher()
        {
            if(AddTeacher.AddNewTeacher() == true)
                US = new PersonalInformation();
        }
      
    }
}