public class PasswordBoxHelper
{
public static readonly DependencyProperty PasswordProperty =
DependencyProperty.RegisterAttached(``"Password"``,
typeof``(``string``), typeof``(PasswordBoxHelper),
new FrameworkPropertyMetadata(``string``.Empty, OnPasswordPropertyChanged));
public static readonly DependencyProperty AttachProperty =
DependencyProperty.RegisterAttached(``"Attach"``,
typeof``(``bool``), typeof``(PasswordBoxHelper), new PropertyMetadata(``false``, Attach));
private static readonly DependencyProperty IsUpdatingProperty =
DependencyProperty.RegisterAttached(``"IsUpdating"``, typeof``(``bool``),
typeof``(PasswordBoxHelper));
public static void SetAttach(DependencyObject dp, bool value)
{
dp.SetValue(AttachProperty, value);
}
public static bool GetAttach(DependencyObject dp)
{
return (``bool``)dp.GetValue(AttachProperty);
}
public static string GetPassword(DependencyObject dp)
{
return (``string``)dp.GetValue(PasswordProperty);
}
public static void SetPassword(DependencyObject dp, string value)
{
dp.SetValue(PasswordProperty, value);
}
private static bool GetIsUpdating(DependencyObject dp)
{
return (``bool``)dp.GetValue(IsUpdatingProperty);
}
private static void SetIsUpdating(DependencyObject dp, bool value)
{
dp.SetValue(IsUpdatingProperty, value);
}
private static void OnPasswordPropertyChanged(DependencyObject sender,
DependencyPropertyChangedEventArgs e)
{
PasswordBox passwordBox = sender as PasswordBox;
passwordBox.PasswordChanged -= PasswordChanged;
if (!(``bool``)GetIsUpdating(passwordBox))
{
passwordBox.Password = (``string``)e.NewValue;
}
passwordBox.PasswordChanged += PasswordChanged;
}
private static void Attach(DependencyObject sender,
DependencyPropertyChangedEventArgs e)
{
PasswordBox passwordBox = sender as PasswordBox;
if (passwordBox == null``)
return``;
if ((``bool``)e.OldValue)
{
passwordBox.PasswordChanged -= PasswordChanged;
}
if ((``bool``)e.NewValue)
{
passwordBox.PasswordChanged += PasswordChanged;
}
}
private static void PasswordChanged(``object sender, RoutedEventArgs e)
{
PasswordBox passwordBox = sender as PasswordBox;
SetIsUpdating(passwordBox, true``);
SetPassword(passwordBox, passwordBox.Password);
SetIsUpdating(passwordBox, false``);
}
}
