标签:PasswordChanged passwordBox 绑定 static bool wpf PassWord DependencyObject dp
页面:
<Window xmlns:local="clr-namespace:项目名称.Common" /> <PasswordBox local:PasswordBoxHelper.Attach="True" local:PasswordBoxHelper.Password="{Binding Path=LoginData.Password, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Background="Transparent" VerticalContentAlignment="Center" CaretBrush="White" Cursor="IBeam"/>
后台 :
项目名称.Common中添加 PasswordBoxHelper.cs
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); }
标签:PasswordChanged,passwordBox,绑定,static,bool,wpf,PassWord,DependencyObject,dp 来源: https://www.cnblogs.com/lzwei/p/16478235.html
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