
概述
在WPF中使用密码文本框Binding的方法。
解释
public static class PasswordBoxAssistantHelper { public static readonly DependencyProperty PasswordProperty = DependencyProperty.RegisterAttached("Password", typeof(string), typeof(PasswordBoxAssistantHelper), new FrameworkPropertyMetadata(string.Empty, OnPasswordPropertyChanged)); public static readonly DependencyProperty AttachProperty = DependencyProperty.RegisterAttached("Attach", typeof(bool), typeof(PasswordBoxAssistantHelper), new PropertyMetadata(false, Attach)); private static readonly DependencyProperty IsUpdatingProperty = DependencyProperty.RegisterAttached("IsUpdating", typeof(bool), typeof(PasswordBoxAssistantHelper)); 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) { var 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) { var 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) { var passwordBox = sender as PasswordBox; SetIsUpdating(passwordBox, true); SetPassword(passwordBox, passwordBox.Password); SetIsUpdating(passwordBox, false); } }
xmlns:pwdHelper="clr-namespace:[自己的命名空间];assembly=[自己的程序集名]"
<PasswordBox pwdHelper:PasswordBoxAssistantHelper.Password="{Binding Password}" />
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