WPF PasswordBox 自定义依赖属性实现绑定

1、直接上代码

public class PasswordHelper
   {
       public static readonly DependencyProperty PasswordProperty = DependencyProperty.RegisterAttached("Password", typeof(string), typeof(PasswordHelper),
           new PropertyMetadata(new PropertyChangedCallback(OnPropertyChanged)));
 
       public static string GetPassword(DependencyObject d)
       {
           return (string)d.GetValue(PasswordProperty);
       }
       public static void SetPassword(DependencyObject d, string value)
       {
           d.SetValue(PasswordProperty, value);
       }
 
       public static readonly DependencyProperty AttachProperty = DependencyProperty.RegisterAttached("Attach", typeof(string), typeof(PasswordHelper),
           new PropertyMetadata(new PropertyChangedCallback(OnAttachChanged)));
 
       public static string GetAttach(DependencyObject d)
       {
           return (string)d.GetValue(AttachProperty);
       }
       public static void SetAttach(DependencyObject d, string value)
       {
           d.SetValue(AttachProperty, value);
       }
 
       static bool _isUpdating = false;
       private static void OnPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
       {
           PasswordBox pb = (d as PasswordBox);
           pb.PasswordChanged -= Pb_PasswordChanged;
           if (!_isUpdating)
               (d as PasswordBox).Password = e.NewValue.ToString();
           pb.PasswordChanged += Pb_PasswordChanged;
       }
 
       private static void OnAttachChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
       {
           PasswordBox pb = (d as PasswordBox);
           pb.PasswordChanged += Pb_PasswordChanged;
       }
 
       private static void Pb_PasswordChanged(object sender, RoutedEventArgs e)
       {
           PasswordBox pb = (sender as PasswordBox);
           _isUpdating = true;
           SetPassword(pb, pb.Password);
           _isUpdating = false;
       }
   }