RxWhenChanged

Helpers for ViewModels

WhenChanged

Extension for INotifyPropertyChanged interface. Use it to observe property changes in ViewModels.

Signature:

IObservable<TResult> WhenChanged<TResult>(this INotifyPropertyChanged self, string property)

Usage:

this.WhenChanged<string>(nameof(Input))
  .Delay(TimeSpan.FromMilliseconds(100), scheduler)
  .Subscribe(v => Output = v);

RxCommand

ICommand implementation with Rx Observables.

Signature:

public RxCommand(IObservable<bool> canExecute, Func<object, Task<T>> execute)

canExecute parameter is mandatory. Use Observable.Return(true) in case if don't need it.

Usage:

var cmd = new RxCommand<string>(cmdCanExecute, DoSomethingAsync);
cmd.Results.Subscribe(...);
cmd.ThrownExceptions.Subscribe(...);
cmd.IsExecuting.Subscribe(...);

Do not forget to call Dispose() in real projects!

Please refer to unit tests for documentation and inspiration. Feel free to create Issues with bugs or propositions. Thanks!