c# - 用于 “SecureString”的TypeConverter不支持转换字符串

Question

我有一个正在使用MVVM模式实现的WPF应用程序。在此应用程序中，我试图通过附加属性从PasswordBox中获取密码。但是，我得到了上面看到的错误，并且不确定为什么会得到它。这是我所拥有的:

XAML

<PasswordBox x:Name="passwordTextbox" HorizontalAlignment="Left" Height="31" Margin="316,194,0,0" VerticalAlignment="Top" Width="208"
                     FontSize="16" IsEnabled="{Binding IsEnabled}"
                     vm:PasswordBoxAttachedProperty.EncryptedPassword="PasswordSecureString, Mode=Twoway, UpdateSourceTrigger=PropertyChanged" />

附加属性

using System.Security;
using System.Windows;

namespace QMAC.ViewModel
{
    public static class PasswordBoxAttachedProperty
    {


        public static SecureString GetEncryptedPassword(DependencyObject obj)
        {
            return (SecureString)obj.GetValue(EncryptedPasswordProperty);
        }

        public static void SetEncryptedPassword(DependencyObject obj, SecureString value)
        {
            obj.SetValue(EncryptedPasswordProperty, value);
        }

        // Using a DependencyProperty as the backing store for MyProperty.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty EncryptedPasswordProperty =
            DependencyProperty.RegisterAttached("EncryptedPassword", typeof(SecureString), typeof(PasswordBoxAttachedProperty));
    }
}

有什么建议？

Answer 1

你可能想写

vm:PasswordBoxAttachedProperty.EncryptedPassword=
    "{Binding PasswordSecureString, Mode=Twoway, UpdateSourceTrigger=PropertyChanged}"

代替

vm:PasswordBoxAttachedProperty.EncryptedPassword=
    "PasswordSecureString, Mode=Twoway, UpdateSourceTrigger=PropertyChanged"