// LiteMainWindowViewModel.cs using System; using System.ComponentModel; namespace v2rayN.ViewModels { public class LiteMainWindowViewModel : INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; // Properties, methods, and other members can be added here. protected virtual void OnPropertyChanged(string propertyName) { PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName)); } } }