public MainWindowModel()
{
ServerResult = "Haven't talked to the server yet...";
var firstAndLastFilled = this.WhenAnyValue(vm => vm.FirstName, vm => vm.LastName,
(f, l) => !string.IsNullOrWhiteSpace(f) && !string.IsNullOrWhiteSpace(l));
ChangeName = ReactiveCommand.CreateAsyncTask(firstAndLastFilled, _ => PretendToCallTheServer());
ChangeName.Subscribe(r => ServerResult = r);
}
public PersonViewModel()
{
_fullName = this.WhenAnyValue(vm => vm.FirstName, vm => vm.LastName, (f, l) => string.Format("{0} {1}", f, l))
.ToProperty(this, vm => vm.FullName);
var firstAndLastFilled = this.WhenAnyValue(vm => vm.FirstName, vm => vm.LastName,
(f, l) => !string.IsNullOrWhiteSpace(f) && !string.IsNullOrWhiteSpace(l));
ChangeName = ReactiveCommand.CreateAsyncTask(firstAndLastFilled, _ => PretendToCallTheServer());
ChangeName.Subscribe(r => ServerResult = r);
}