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  • WPF PasswordBox不支持绑定解决方法

    PasswordBox的Password属性因为安全原因不支持直接绑定,可以使用依赖属性实现。直接插入代码

    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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  • 原文地址:https://www.cnblogs.com/wxjing67/p/3935717.html
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