wpf - 从 PasswordBox 获取密码

Question

我在这里找到了一些关于这个问题的信息，但不知何故我并没有真正得到它;-) 从我所读到的内容来看，由于安全原因，PasswordBox 的密码不能绑定(bind)到属性，即保留普通密码在内存中。

我的模型包含这个:

private SecureString password;
public SecureString Password {
  get { return password; }
  set { password = value; }
}

虽然不支持将数据绑定(bind)到 PasswordBox，但 Microsoft 必须知道如何从 PasswordBox 获取密码并以安全的方式使用它，嗯？

什么是合适且相对简单的方法？

Answer 1

为此我写了一个UserControl使用可绑定(bind)密码 - SecureString .此代码UserControl好像:

代码隐藏:

public partial class BindablePasswordBox : UserControl
    {
        public static readonly DependencyProperty SecurePasswordProperty = DependencyProperty.Register(
           "SecurePassword", typeof(SecureString), typeof(BindablePasswordBox), new PropertyMetadata(default(SecureString)));

        public SecureString SecurePassword
        {
            get { return (SecureString)GetValue(SecurePasswordProperty); }
            set { SetValue(SecurePasswordProperty, value); }
        }

        public BindablePasswordBox()
        {
            InitializeComponent();
        }

        private void PasswordBox_OnPasswordChanged(object sender, RoutedEventArgs e)
        {
            SecurePassword = ((PasswordBox)sender).SecurePassword;
        }

        private void BindablePasswordBox_OnGotFocus(object sender, RoutedEventArgs e)
        {
            passwordBox.Focus();
        }
    }

XAML:

<UserControl x:Class="Sol.Controls.BindablePasswordBox"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="300"
             GotFocus="BindablePasswordBox_OnGotFocus">
    <PasswordBox x:Name="passwordBox" PasswordChanged="PasswordBox_OnPasswordChanged"/>
</UserControl>