public MainViewModel()
{
_multiEngine = this.ObservableToProperty(
Engines.Changed.Select(_ => Engines.Count > 1),
vm => vm.MultiEngine);
_singleEngine = this.ObservableToProperty(
Engines.Changed.Select(_ => Engines.Count == 1),
vm => vm.SingleEngine);
_languages = this.ObservableToProperty(
this.ObservableForProperty(vm => vm.SelectedEngine)
.Select(_ => SelectedEngine.Value.Languages),
vm => vm.Languages);
_languages.Subscribe(_ => EnsureLanguage());
Engines.Changed.Subscribe(_ => EnsureEngine());
Observable.Merge(
this.ObservableForProperty(vm => vm.DesignTimeMode).IgnoreValues(),
this.ObservableForProperty(vm => vm.SelectedEngine).IgnoreValues(),
this.ObservableForProperty(vm => vm.SelectedLanguage).IgnoreValues(),
this.ObservableForProperty(vm => vm.RazorCode).IgnoreValues())
.ObserveOn(RxApp.DeferredScheduler)
.Subscribe(_ => Regenerate());
this.PropertyChanged += MainViewModel_PropertyChanged;
}
