c# - 密码框不会屏蔽我的密码 WPF

Question

我在 WPF 中使用密码框，在编辑模式下，密码框不会屏蔽我的密码。

这是我的代码示例:

<PasswordBox Width="200" Password="{Binding Path=Password, ValidatesOnDataErrors=True, NotifyOnValidationError=True, Mode=TwoWay}"  HorizontalAlignment="Left"/>

我尝试包含 Passwordchar = '*'

Answer 1

出于安全原因，您不能直接在 View 模型中获取密码值，您必须创建依赖属性。

下面是密码代码。

开发者:

public static readonly DependencyProperty BoundPassword =
        DependencyProperty.RegisterAttached("BoundPassword", typeof(string), typeof(PasswordBoxHelper), new PropertyMetadata(string.Empty, OnBoundPasswordChanged));

    public static readonly DependencyProperty BindPassword = DependencyProperty.RegisterAttached(
        "BindPassword", typeof(bool), typeof(PasswordBoxHelper), new PropertyMetadata(false, OnBindPasswordChanged));

    private static readonly DependencyProperty UpdatingPassword =
        DependencyProperty.RegisterAttached("UpdatingPassword", typeof(bool), typeof(PasswordBoxHelper), new PropertyMetadata(false));

    private static void OnBoundPasswordChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var box = d as PasswordBox;
        if(d == null || !GetBindPassword(d))
        {
            return;
        }
        box.PasswordChanged -= HandlePasswordChanged;

        var newPassword = (string)e.NewValue;

        if(!GetUpdatingPassword(box))
        {
            box.Password = newPassword;
        }

        box.PasswordChanged += HandlePasswordChanged;
    }

    private static void OnBindPasswordChanged(DependencyObject dp, DependencyPropertyChangedEventArgs e)
    {

        var box = dp as PasswordBox;

        if(box == null)
        {
            return;
        }

        bool wasBound = (bool)(e.OldValue);
        bool needToBind = (bool)(e.NewValue);

        if(wasBound)
        {
            box.PasswordChanged -= HandlePasswordChanged;
        }

        if(needToBind)
        {
            box.PasswordChanged += HandlePasswordChanged;
        }
    }

    private static void HandlePasswordChanged(object sender, RoutedEventArgs e)
    {
        var box = sender as PasswordBox;
        SetUpdatingPassword(box, true);
        SetBoundPassword(box, box.Password);
        SetUpdatingPassword(box, false);
    }

    public static void SetBindPassword(DependencyObject dp, bool value)
    {
        dp.SetValue(BindPassword, value);
    }

    public static bool GetBindPassword(DependencyObject dp)
    {
        return (bool)dp.GetValue(BindPassword);
    }

    public static string GetBoundPassword(DependencyObject dp)
    {
        return (string)dp.GetValue(BoundPassword);
    }

    public static void SetBoundPassword(DependencyObject dp, string value)
    {
        dp.SetValue(BoundPassword, value);
    }

    private static bool GetUpdatingPassword(DependencyObject dp)
    {
        return (bool)dp.GetValue(UpdatingPassword);
    }

    private static void SetUpdatingPassword(DependencyObject dp, bool value)
    {
        dp.SetValue(UpdatingPassword, value);
    }

下面是 XAML:

  <PasswordBox x:Name="PasswordBox" 
                                     utility:PasswordBoxHelper.BindPassword="true" 
                                     utility:PasswordBoxHelper.BoundPassword="{Binding Path=Password,  
        Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>