How do I implement INotifyPropertyChanged to automatically update the data in the DataGrid?

Question

WPF

I am making a desktop application using Entity Framework on WPF.
Wrote the following class.

public class PlavkaViewModel : INotifyPropertyChanged
    {
        private Model.MagnesiumEntities _dataContext;
        public ObservableCollection<Model.plavka> Plavkas { get; private set; }
 
        public PlavkaViewModel()
        {
            _dataContext = new Model.MagnesiumEntities();
            Plavkas = new ObservableCollection<Model.plavka>(_dataContext.plavkas);  
        }
 
        public void SaveChanges()
        {
            _dataContext.SaveChanges();
        }
 
        #region INotifyPropertyChanged
         // (Что мне тут делать?)
        /// <summary>
        /// Событие, которое мы должны вызывать каждый раз когда хотим сообщить об изменении данных. 
        /// </summary>
        public event PropertyChangedEventHandler PropertyChanged;
 
        /// <summary>
        /// Метод для вызова события об изменении свойства ViewModel.
        /// </summary>
        /// <param name="propertyName"></param>
        private void RaisePropertyChanged(string propertyName)
        {
            if (PropertyChanged == null)
            {
                return;
            }
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
 
        #endregion
    }

And then tied it to the DataGrid. Everything is displayed well. But how can I make it so that when the data in the database changes (for example, from another client), this would immediately be displayed in the table?

Answer 1

you need one of two things:
1) somehow notify other clients that something has changed in the database. here you will need an application server through which all requests will go, and which will send notifications to clients
2) once every n seconds, check if something has changed in the database

Answer 2

You must add a call to the PropertyChanged event for each property that needs to be updated.
for example

public class People : INotifyPropertyChanged
{
      public event PropertyChangedEventHandler PropertyChanged;

      private string _firstName;

      public string FirstName
      {
            get { return _firstName; }
            set
            {
                _firstName = value;
                PropertyChanged(this, new PropertyChangedEventArgs("FirstName"));
            }
      }
}