How do specify properties using [Reactive], that are using my property?

[janniksam]

For example having this in my ViewModel:

[Reactive]public string FirstName { get; set; }
[Reactive]public string LastName { get; set; }

public string FullName => FirstName + " " + LastName;

Is there a way to automatically get INotifyPropertyChanged invoked for FullName, whenever one of the first two properties are changed?
In other words, is there a way to define additional properties, that are weaved into the first two properties?

[anaisbetts]

Yes, you are looking for ToProperty and ObservableAsPropertyHelper - https://www.reactiveui.net/docs/handbook/observable-as-property-helper/

[glennawatson]

There's also another built in functionality in the fody for this

ReactiveUI/src/ReactiveUI.Fody.Tests/Mocks/FacadeModel.cs

Line 40 in 4894cae

[ReactiveDependency(nameof(Dependency), TargetProperty = "StringProperty")]