using MewtocolNet; using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace Examples.WPF.ViewModels { public class AppViewModel : ViewModelBase { private IPlc? plc; public bool PlcIsNull => plc == null; public bool PlcIsNotNull => plc != null; public IPlc? Plc { get => plc; set { plc = value; OnPropChange(); OnPropChange(nameof(PlcIsNull)); OnPropChange(nameof(PlcIsNotNull)); } } } }