reactiveui

ViewModel public class MyViewModel:ReactiveObject, IRoutableViewModel{ private ReactiveList<string> _appExtensions; public MyViewModel(IScreen screen){ HostScreen = screen; AppExtensions = new ReactiveList<string>(); GetApplicationExtensions = ReactiveCommand.CreateAsyncTask(x => _schemaService.GetApplicationExtensions()); // returns a Task<IEnumerable<string>> GetApplicationExtensions .ObserveOn(RxApp.MainThreadScheduler) .SubscribeOn(RxApp.TaskpoolScheduler) .Subscribe(p => { using (_appExtensions.SuppressChangeNotifications()) { _appExtensions.Clear(); _appExtensions.AddRange(p); } });

I'm starting to work with the ReactiveUI framework on a Silverlight project and need some help working with ReactiveCommands. In my view model, I have something that looks roughly like this (this is just a simplified example): public class MyViewModel : ReactiveObject { private int MaxRecords = 5; public ReactiveCommand AddNewRecord { get; protected set; } private ObservableCollection<string> _myCollection = new ObservableCollection<string>(); public ObservableCollection<string> MyCollection { get { return _myCollection; } set { _myCollection = value; raiseCollectionChanged("MyCollection"); }

Lately I've trying to get myself into the new age of UI development and discovered ReactiveUI. I love its declarative nature. I wanted to make a complete switch, so I tried to understand how are things made in this new world of ReactiveUI. I choose ReactiveUI because I've seen that is maintained by a very clever guy (Paul C. Betts). I'm very new to it and I will likely be flooding StackOverflow with questions about it because I has a huge power and I think it deserves to be learnt and mastered . Let's get into the details: I've always used View-First. I'm a veteran user of the Cinch Framework

I've looked around at a number of the ReactiveUI samples, but I can't see a good simple example of how to handle exceptions, where a message should be displayed to the user. (If there is a good example can somebody point me to it?). My first question is how to handle an exception with ReactiveCommand and ToProperty. For example, I have the following code: public class MainWindowViewModel : ReactiveObject { public ReactiveCommand CalculateTheAnswer { get; set; } public MainWindowViewModel() { CalculateTheAnswer = new ReactiveCommand(); CalculateTheAnswer .SelectMany(_ => AnswerCalculator())