I had a look on the snoop sources. I modified it and wrote a very, very basic example that works:
String^ ownerPropertyName = "IsActive";
DependencyObject^ propertyOwner = window;
DependencyPropertyDescriptor^ ownerPropertyDescriptor = DependencyPropertyDescriptor::FromName(ownerPropertyName, propertyOwner->GetType(), propertyOwner->GetType());
DependencyProperty^ ownerProperty = ownerPropertyDescriptor->DependencyProperty;
Type^ ownerPropertyType = ownerProperty->PropertyType;
DependencyProperty^ myProperty = DependencyProperty::Register(ownerPropertyName, ownerPropertyType, GetType(), gcnew PropertyMetadata(gcnew PropertyChangedCallback(&MyClass::BoundPropertyChangedCallback)));
Binding^ myPropertyToOwnerPropertyBinding = gcnew Binding(ownerPropertyName);
myPropertyToOwnerPropertyBinding->Mode = BindingMode::OneWay;
myPropertyToOwnerPropertyBinding->Source = propertyOwner;
BindingOperations::SetBinding(this, myProperty, myPropertyToOwnerPropertyBinding);
And:
static void BoundPropertyChangedCallback(DependencyObject^ me, DependencyPropertyChangedEventArgs args)
{
Debug::WriteLine("BoundPropertyChangedCallback: "+args.OldValue+", "+args.NewValue+", "+args.Property->Name);
}
Looks pretty complicated to me. I have no idea if that binding stuff is really necessary. In fact this can even subscribe to properties that do not have events (like IsMouseOver) and can operate on objects that do not implement INotifyPropertyChanged (like Window). And it does not need any switch/case for properties.