"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，我试图通过附加的属性从 PasswordBox 获取密码。但是，我收到上面看到的错误，我不确定为什么会收到它。这是我拥有的：

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" />

附上属性

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));
    }
}

有什么建议吗？

Answer 1

你可能想写

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

而不是

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

"SecureString" 的 TypeConverter 不支持转换字符串

TypeConverter for "SecureString" does not support converting a string

c#

wpf

mvvm

attached-properties