WPF PasswordBox不支持綁定解決方法

PasswordBox的Password屬性因為安全原因不支持直接綁定，可以使用依賴屬性實現。直接插入代碼

public 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);}}

?使用：

  <PasswordBox helper:PasswordHelper.Attach="True" helper:PasswordHelper.Password="{Binding Model.Password, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"><PasswordBox.InputBindings><KeyBinding Key="Enter" Command="{Binding LoginCommand}"/></PasswordBox.InputBindings></PasswordBox>

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