WPF-PasswordBox绑定

Microsoft.Xaml.Behaviors.Wpf

<PasswordBox>
    <i:Interaction.Behaviors>
        <local:PasswordBoxBindingBehavior Password="{Binding MyPassword, Mode=TwoWay}" />
    </i:Interaction.Behaviors>
</PasswordBox>

 

using System.Windows;
using System.Windows.Controls;
using System.Windows.Interactivity;

public class PasswordBoxBindingBehavior : Behavior<PasswordBox>
{
    public static readonly DependencyProperty PasswordProperty =
        DependencyProperty.Register(nameof(Password), typeof(string), typeof(PasswordBoxBindingBehavior),
            new FrameworkPropertyMetadata(string.Empty, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault, OnPasswordChanged));

    public string Password
    {
        get => (string)GetValue(PasswordProperty);
        set => SetValue(PasswordProperty, value);
    }

    protected override void OnAttached()
    {
        base.OnAttached();
        AssociatedObject.PasswordChanged += OnPasswordBoxPasswordChanged;
    }

    protected override void OnDetaching()
    {
        base.OnDetaching();
        AssociatedObject.PasswordChanged -= OnPasswordBoxPasswordChanged;
    }

    private void OnPasswordBoxPasswordChanged(object sender, RoutedEventArgs e)
    {
        Password = AssociatedObject.Password;
    }

    private static void OnPasswordChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var behavior = (PasswordBoxBindingBehavior)d;
        var passwordBox = behavior.AssociatedObject;
        if (passwordBox != null && passwordBox.Password != (string)e.NewValue)
        {
            passwordBox.Password = (string)e.NewValue ?? string.Empty;
        }
    }
}