将一个属性绑定到另一个属性并链接/触发OnPropertyChanged

I'm binding to properties from XAML in a WPF application, but this query is about raising 'PropertyChanged' events on one class property when another is raised in a different class/object. One use case is where a combobox ItemsSource binds to a property (PropB in my simplified example below) and that property returns a collection based on other properties (PropA below). PropB in class B needs to raise PropertyChanged when PropA in class A changes, but class A does not reference class B.I'm binding to properties from XAML in a WPF ap