WPF PasswordBox.Password 的数据绑定

WPF的PasswordBox控件的Password属性不是依赖属性，无法直接进行数据绑定，为使其在MVVM模式中正常使用，可以为PasswordBox增加一个助手类，代码如下：

注：代码摘自：http://www.wpftutorial.net/PasswordBox.html

using System.Windows; using System.Windows.Controls; namespace Oyi319.Helper { ///

/// 为PasswordBox控件的Password增加绑定功能 ///

public static 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); } } }  

 

那么XAML绑定代码如下：

 

MVVM模式XAML窗口声明代码如下：