Mapping View Property to ViewModel using Catel - view

Question

I'm doing a login view. Problem is that the PasswordBox cant be binded to the view model so im mapping a property of the view to the viewmodel.
This is the View
public partial class LoginView : MetroDataWindow
{
/// <summary>
/// Initializes a new instance of the <see cref="LoginView"/> class.
/// </summary>
public LoginView()
: this(null) { }
/// <summary>
/// Initializes a new instance of the <see cref="LoginView"/> class.
/// </summary>
/// <param name="viewModel">The view model to inject.</param>
/// <remarks>
/// This constructor can be used to use view-model injection.
/// </remarks>
public LoginView(LoginViewModel viewModel)
: base(viewModel)
{
InitializeComponent();
}
[ViewToViewModel(MappingType = ViewToViewModelMappingType.ViewToViewModel)]
public SecureString Contrasena
{
get { return (SecureString)GetValue(ContrasenaPropiedad); }
set { SetValue(ContrasenaPropiedad, value); }
}
// Using a DependencyProperty as the backing store for MapCenter. This enables animation, styling, binding, etc...
public static readonly DependencyProperty ContrasenaPropiedad = DependencyProperty.Register("Contrasena", typeof(SecureString),
typeof(LoginView), new PropertyMetadata(null, (sender, e) => ((LoginView)sender).UpdateContrasena()));
private void UpdateContrasena()
{
MessageBox.Show("VIEW: FirstName changed to " + ContrasenaPropiedad.ToString());
}
private void tbPassword_PasswordChanged(object sender, RoutedEventArgs e)
{
Contrasena = tbPassword.SecurePassword;
}
protected override void OnPropertyChanged(DependencyPropertyChangedEventArgs e)
{
base.OnPropertyChanged(e);
if (e.Property == ContrasenaPropiedad)
{
int i = 0;
}
}
}
this is the viewmodel part with the property
public static readonly PropertyData ContrasenaPropiedad = RegisterProperty("Contrasena", typeof(SecureString), null, (sender, e) => ((LoginViewModel)sender).OnContrasenaChange());
public void OnContrasenaChange()
{
_messageService.Show("VIEW MODEL: FirstName changed to " + Contrasena.ToString());
}
public SecureString Contrasena
{
get
{
return GetValue<SecureString >(ContrasenaPropiedad);
}
set
{
SetValue(ContrasenaPropiedad, value);
}
}
the onChange function of the viewmodel never triggers.
I based this code on the example given in the last comment in this question
Catel ViewToViewModel attribute
But it does not work. Am I missing something or was the bug commented there never fixed?
Also since the view is the only one changing the property should i use the ViewToViewModelMappingType.ViewToViewModel type instead? does it change the implementation of the mapping in any way?

Answer 1

Passwords are a special kind of breed. But Catel has a solution for that problem, the UpdateBindingOnPasswordChanged behavior:
<PasswordBox>
<i:Interaction.Behaviors>
<catel:UpdateBindingOnPasswordChanged Password="{Binding Password, Mode=TwoWay}" />
</i:Interaction.Behaviors>
</PasswordBox>
ps. are you aware of Catel.Fody? It makes your code more readable and easier to write.