Не получается реализовать привязку DataGrid к свойству ObservableCollection

Используется паттерн MVVM. База данных обновляется при добавлении строки. Коллекция также содержит измененные или добавленные строки, но DataGrid не обновляется.

Model

namespace Terminal_Forts_ММВБ.Model
{
    public class PortfelStrateg : ViewModelINPC
    {
        private int id;
        public int Id
        {
            get => id; set
            {
                if (id != value)
                {
                    _ = SetField(ref id, value);
                }
            }
        }

        private string portfel;
        public string Portfel
        {
            get => portfel; set
            {
                if (portfel != value)
                {
                    _ = SetField(ref portfel, value);
                }
            }
        }

        private string instrument;
        public string Instrument
        {
            get => instrument; set
            {
                if (instrument != value)
                {
                    _ = SetField(ref instrument, value);
                }
            }
        }
        
        private double zena_tek;
        public double Zena_tek
        {
            get => zena_tek; set
            {
                if (zena_tek != value)
                {
                    _ = SetField(ref zena_tek, value);
                }
            }
        }
    }
}

public class ViewModelINPC : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;
        protected virtual void OnPropertyChanged(string propertyName = "") => PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));

        protected bool SetField<T>(ref T field, T value, [CallerMemberName] string propertyName = "")
        {
            if (EqualityComparer<T>.Default.Equals(field, value)) return false;
            field = value;
            OnPropertyChanged(propertyName);
            return true;
        }
    }

namespace Terminal_Forts_ММВБ.Model
{
    public static class DataWorker
    {
     public static ObservableCollection<PortfelStrateg> GetAllPortfelStrategs()
        {
            using (ApplicationContext db = new ApplicationContext())
            {
ObservableCollection<PortfelStrateg> portfelStrategsObservable = new ObservableCollection<PortfelStrateg>();
                var result = db.PortfelStrategs.ToList();
                for (int i = 0; i < result.Count; i++)
                {
                    portfelStrategsObservable.Add(result[i]);
                }
                return portfelStrategsObservable;
            }
        }
    }       
}

ViewModel

namespace Terminal_Forts_ММВБ.ViewModel
{
    public class ApplicationViewModel : ViewModelINPC
    {
        #region Вывести весь список (binding на таблицы)
        //Таблица PortfelStrateg
        private ObservableCollection<PortfelStrateg> allPortfelStrategs = DataWorker.GetAllPortfelStrategs();
        public ObservableCollection<PortfelStrateg> AllPortfelStrategs
        {
            get => allPortfelStrategs;
            set
            {
                if (allPortfelStrategs != value)
                {
                    _ = SetField(ref allPortfelStrategs, value);
                }
            }
        }
        #endregion

      #region Метод редактирования dataGridPortfelStrateg по событию колбэка
      public void EditDataGridPortfelStrategMetodEvent()
      {
        //Вычисления и запись в базу данных
        AllPortfelStrategs = DataWorker.GetAllPortfelStrategs();
      }
    }
}

View

namespace Terminal_Forts_ММВБ.View
{
   public partial class MainWindow : Window
    {
private readonly ApplicationViewModel viewModel = new ApplicationViewModel();
        public MainWindow()
        {
            InitializeComponent();
            DataContext = viewModel;            
        }
    }
}

Xaml

<Window
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:viewmodel="clr-namespace:Terminal_Forts_ММВБ.ViewModel"
    xmlns:wpf="clr-namespace:LiveCharts.Wpf;assembly=LiveCharts.Wpf"
    x:Class="Terminal_Forts_ММВБ.View.MainWindow"        
       mc:Ignorable="d"
    <Window.DataContext>
        <viewmodel:ApplicationViewModel/>
    </Window.DataContext>
    <Grid>
        <DataGrid ItemsSource="{Binding AllPortfelStrategs}">
            <DataGrid.Columns>
              <DataGridTextColumn Binding="{Binding Portfel}"/>
              <DataGridTextColumn Binding="{Binding Instrument}"/>
              <DataGridTextColumn Binding ="{Binding Zena_tek}"/>
            </DataGrid.Columns>
        </DataGrid>
    </Grid>
</Window>