using System; using GalaSoft.MvvmLight; using GalaSoft.MvvmLight.Command; namespace HandyControlDemo.ViewModel { public class BadgeDemoViewModel : ViewModelBase { private int _count = 1; public int Count { get => _count; #if netle40 set => Set(nameof(Count), ref _count, value); #else set => Set(ref _count, value); #endif } public RelayCommand CountCmd => new Lazy(() => new RelayCommand(() => Count++)).Value; } }