IOT/UIShare/Helpers/PasswordBoxHelper.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;

namespace UIShare.Helpers
{
    public static class PasswordBoxHelper
    {
        public static readonly DependencyProperty PasswordProperty =
            DependencyProperty.RegisterAttached(
                "Password",
                typeof(string),
                typeof(PasswordBoxHelper),
                new FrameworkPropertyMetadata(
                    string.Empty,
                    FrameworkPropertyMetadataOptions.BindsTwoWayByDefault,
                    OnPasswordPropertyChanged));

        public static void SetPassword(DependencyObject d, string value)
            => d.SetValue(PasswordProperty, value);

        public static string GetPassword(DependencyObject d)
            => (string)d.GetValue(PasswordProperty);

        private static void OnPasswordPropertyChanged(
            DependencyObject d,
            DependencyPropertyChangedEventArgs e)
        {
            if (d is PasswordBox pb)
            {
                pb.PasswordChanged -= PasswordChanged;
                if (pb.Password != (string)e.NewValue)
                {
                    pb.Password = (string)e.NewValue;
                }
                pb.PasswordChanged += PasswordChanged;
            }
        }

        private static void PasswordChanged(object sender, RoutedEventArgs e)
        {
            if (sender is PasswordBox pb)
            {
                SetPassword(pb, pb.Password);
            }
        }
    }
}