ReactiveUI: Using CanExecute with a ReactiveCommand

Question

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 tha

Answer 1

Actually, there's a better way to do this, change your ObservableCollection to ReactiveCollection (which inherits from ObservableCollection but adds some extra properties):

MyCollection = new ReactiveCollection();

AddNewRecord = new ReactiveCommand(
    MyCollection.CollectionCountChanged.Select(count => count < MaxRecords));

The catch here now is though, you can't overwrite the MyCollection, only repopulate it (i.e. Clear() + Add()). Let me know if that's a dealbreaker, there's a way to get around that too though it's a bit more work.