ReactiveUI WhenAnyObservable doesn't work for me - reactiveui

Question

My app is a winforms application and it references ReactiveUI 6.5. I'm trying to close window when user type "Exit" in a TextBox, but for some reason nothing happens.
This is my View:
public partial class HomeView : Form, IViewFor<HomeViewModel>
{
public HomeView()
{
InitializeComponent();
ViewModel = new HomeViewModel();
this.Bind(ViewModel, x => x.EnteredText, x => x.textBox.Text);
this.ViewModel.WhenAnyObservable(x => x.ExitCmd).Subscribe(_ => this.Close());
}
object IViewFor.ViewModel
{
get { return ViewModel; }
set { ViewModel = (HomeViewModel)value; }
}
public HomeViewModel ViewModel { get; set; }
}
And this is my ViewModel:
public class HomeViewModel : ReactiveUI.ReactiveObject
{
string _text;
public string EnteredText
{
get { return _text; }
set { this.RaiseAndSetIfChanged(ref _text, value); }
}
public ReactiveCommand<object> ExitCmd { get; private set; }
public HomeViewModel()
{
ExitCmd = ReactiveCommand.Create(this.WhenAny(x => x.EnteredText, y => y.Value == "Exit"));
}
}

Answer 1

In your ViewModel, you should describe the relationship between your Exit Command and EntertedText
public class HomeViewModel : ReactiveUI.ReactiveObject
{
private string _text;
public string EnteredText
{
get { return _text; }
set { this.RaiseAndSetIfChanged(ref _text, value); }
}
public ReactiveCommand<object> ExitCmd { get; private set; }
public HomeViewModel()
{
ExitCmd = ReactiveCommand.Create();
this.WhenAny (x => x.EnteredText, x => x.Value == "Exit")
.Where(k => k == true)
.DistinctUntilChanged()
.InvokeCommand (ExitCmd);
}
}
Then in your view, you can simply subscribe it
public partial class HomeView : Form, IViewFor<HomeViewModel>
{
public HomeView()
{
InitializeComponent();
ViewModel = new HomeViewModel();
this.Bind(ViewModel, x => x.EnteredText, x => x.textBox.Text);
this.ViewModel.ExitCmd.Subscribe (_ => this.Close());
}
object IViewFor.ViewModel
{
get { return ViewModel; }
set { ViewModel = (HomeViewModel)value; }
}
public HomeViewModel ViewModel { get; set; }
}

Answer 2

You've almost got it, except nothing is telling your ExitCmd to Execute. The value you're passing to ReactiveCommand.Create is the canExecute property. You should change it to this:
ExitCmd = ReactiveCommand.Create();
this.WhenAnyValue(x => x.EnteredText)
.Where(x => x == "Exit")
.InvokeCommand(ExitCmd);
InvokeCommand actually executes the command parameter, passing each value from the observable sequence into the ExecuteAsync method as the parameter.