LightBulbViewModel.cs

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using Dreamine.MVVM.ViewModels;
 
namespace DreamineWeb.ViewModels.Demos;

public sealed class LightBulbModel
{
    public bool IsOn { get; set; }
    public int ToggleCount { get; set; }
}

public sealed class LightBulbEvent
{
    private readonly LightBulbModel _model;
    public LightBulbEvent(LightBulbModel model) => _model = model;

    public void Toggle()
    {
        _model.IsOn = !_model.IsOn;
        _model.ToggleCount++;
    }

    public void Set(bool on)
    {
        if (_model.IsOn == on) return;
        _model.IsOn = on;
        _model.ToggleCount++;
    }
}

public sealed class LightBulbViewModel : ViewModelBase
{
    private readonly LightBulbModel _model = new();
    private readonly LightBulbEvent _event;

    public LightBulbViewModel() => _event = new LightBulbEvent(_model);

    public bool IsOn
    {
        get => _model.IsOn;
        set
        {
            _event.Set(value);
            RaiseState();
        }
    }

    public int ToggleCount => _model.ToggleCount;

    public string StatusText => _model.IsOn ? "ON" : "OFF";

    public void Toggle()
    {
        _event.Toggle();
        RaiseState();
    }

    private void RaiseState()
    {
        OnPropertyChanged(nameof(IsOn));
        OnPropertyChanged(nameof(ToggleCount));
        OnPropertyChanged(nameof(StatusText));
    }
}