Where i need to define INotifyPropertyChanged in case of Base and sub classes

Question

i have this Base class:

public abstract class WiresharkFile
{
    protected string _fileName;
    protected int _packets;
    protected int _packets         


        

Answer 1

Same answer with IIan but for C# 8 and .Net Framework 4.8.

1. Base Model

public class ObservableObject : INotifyPropertyChanged
{
        public event PropertyChangedEventHandler PropertyChanged;

        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

        protected virtual void OnPropertyChanged(Expression> raiser)
        {
            string propName = ((MemberExpression)raiser?.Body).Member.Name;
            OnPropertyChanged(propName);
        }

        protected bool Set(ref T field, T value, [CallerMemberName] string name = null)
        {
            if (!EqualityComparer.Default.Equals(field, value))
            {
                field = value;
                OnPropertyChanged(name);
                return true;
            }
            return false;
        }
}

2. Your Model

public class Current : ObservableObject
{
        private string _status;

        public Current()
        {
            Status = "Not Connected";
        }

        public string Status
        {
            get { return _status; }
            set
            {
                _status = value;
                OnPropertyChanged(); // call this to update
            }
        }
}

3. How to use?