SL - 摘录 - 解决PasswordBox的Password无法正常绑定的问题

<PasswordBox Grid.Column="1" com:PasswordHelper.Attach="True" com:PasswordHelper.Password="{Binding Path=Password}" Height="26" HorizontalAlignment="Left" Margin="0,80,0,0" Name="passwordBox1" VerticalAlignment="Top" Width="122" />

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public static class PasswordHelper

    {

        public static readonly DependencyProperty PasswordProperty =

        DependencyProperty.RegisterAttached("Password",

        typeof(string), typeof(PasswordHelper),

        new FrameworkPropertyMetadata(string.Empty, OnPasswordPropertyChanged));

        public static readonly DependencyProperty AttachProperty =

        DependencyProperty.RegisterAttached("Attach",

        typeof(bool), typeof(PasswordHelper), new PropertyMetadata(false, Attach));

        private static readonly DependencyProperty IsUpdatingProperty =

        DependencyProperty.RegisterAttached("IsUpdating", typeof(bool),

        typeof(PasswordHelper));

        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);

        }

    }