ReactivePropertySlim is a lightweight version ReactiveProperty.

ReactivePropertySlim provides following features:

  • Implements INotifyPropertyChanged interface.
  • Implements IObservable<T> interface.
  • Provides a Value property.
  • Provides a ForceNotify method.

And ReactivePropertySlim is high performance.

This class can use like same as ReactiveProperty.

var rp = new ReactivePropertySlim<string>("neuecc");
rp.Select(x => $"{x}-san").Subscribe(x => Console.WriteLine(x));
rp.Value = "xin9le";
rp.Value = "okazuki";

Output is as below.


One different which compare the ReactiveProperty is that ReactivePropertySlim can't create from IObservable<T>.

// It isn't valid code.
var rp = Observable.Interval(TimeSpan.FromSeconds(1)).ToReactivePropertySlim();

If want to create Slim class's instance from IObservable<T>, then use the ToReadOnlyReactivePropertySlim extension method.

var rp = Observable.Interval(TimeSpan.FromSeconds(1)).ToReadOnlyReactivePropertySlim();

Dispatch to UI thread

ReactivePropertySlim class doesn't dispatch to UI thread automaticaly. If want this feature, then use the ReactiveProperty or dispatch to UI thread expressly.

var rp = Observable.Interval(TimeSpan.FromSeconds(1))
    .ObserveOnUIDispatcher() // dispatch to UI thread


Slim class doesn't provide the validation feature. If want to this feature, then use to ReactiveProperty class.