ReactiveUI ObservableAsPropertyHelper vs. normal backing variable

Question

I'm struggling with ReactiveUI's learning curve so this question might be naive. Please help me understand the difference between:

ObservableAsPropertyHelper<string> _input
public string Input {get {return _input.Value;}}

and a normal backing variable with RaiseAndSetIfChanged:

private string _input;
public string Input {
    get {return _input;}
    set {RaiseAndSetIfChanged(ref _input, value);}
}

Are they 2 ways to skin the same cat or are there different use cases/intent for the two options?

Answer 1

ObserableAsProperyHelper (OAPH) helps you wrap a Obserable into a property. So it will provide INotifyPropertyChanged (INPC) notifications for when a new value is placed into your observable.

The second method provides a standard property with INPC notifications.