绑定到SecurePassword视图模型 [英] Bind SecurePassword to ViewModel

问题描述

我尝试了 PasswordBox 我的视图模型 SecurePassword 属性绑定code>使用自定义的行为。可悲的是它不能正常工作。

基本上，我添加了一个属性添加到行为，其中包含的目标属性我的视图模型。

任何想法，为什么它不工作？

PS：我目前在回家的路上没有我的笔记本电脑，我会用我的代码在大约15分钟更新的问题。但是，将是很好，如果有人张贴想法或某事。

修改

正如我说过的，这里是一些代码：）

的

行为第一：

 使用系统; 
使用System.Collections.Generic; 
使用System.Text;使用System.Windows 
;使用System.Windows.Controls的
; 
使用System.Windows.Data;使用System.Windows.Documents 
; 
使用System.Windows.Input;使用System.Windows.Media 
; 
使用System.Windows.Media.Imaging;使用System.Windows.Shapes 
; 
使用System.Windows.Interactivity; 
使用System.Security; 
 
命名空间Knerd.Behaviors {
公共类PasswordChangedBehavior：行为< PasswordBox> {
 
保护覆盖无效OnAttached（）{
 AssociatedObject.PasswordChanged + = AssociatedObject_PasswordChanged; 
 base.OnAttached（）; 
} 
 
私人无效AssociatedObject_PasswordChanged（对象发件人，RoutedEventArgs E）{
如果（AssociatedObject.Password！= NULL）
 TargetPassword = AssociatedObject.SecurePassword; 
} 
 
保护覆盖无效OnDetaching（）{
 AssociatedObject.PasswordChanged  -  = AssociatedObject_PasswordChanged; 
 base.OnDetaching（）; 
} 
 
公共SecureString的TargetPassword {
 {返回（SecureString的）的GetValue（TargetPasswordProperty）; } 
集合{的SetValue（TargetPasswordProperty，值）; } 
} 
 
 //使用的DependencyProperty作为后备存储TargetPassword。这使得动画，造型，绑定等等... 
公共静态只读的DependencyProperty TargetPasswordProperty = DependencyProperty.Register（TargetPassword的typeof（SecureString的）的typeof（PasswordChangedBehavior），新PropertyMetadata（默认值（SecureString的）））; 
} 
} 
  

的

PasswordBox ：

 < PasswordBox Grid.Column =1Grid.Row =1保证金=5 WIDTH =300了minWidth =200> 
< I：Interaction.Behaviors> 
<行为：PasswordChangedBehavior TargetPassword ={绑定密码}/> 
< /我：Interaction.Behaviors> 
< / PasswordBox> 
  

和最后的部分我的视图模型

 私人SecureString的密码; 
 
公共SecureString的密码{
 {返回密码; } 
集合{
如果（密码=价值！）{
密码=价值; 
 OnPropertyChanged（密码）; 
} 
} 
} 
  

我希望有人能帮助， ATM我用的是代码隐藏版本，但我宁愿不会。

编辑2

其实什么不工作是，在 TargetPassword 属性没有更新我的视图模型 <财产/ p>

解决方案

我想我找到了一个有点奇怪的解决方案。请改善，如果有某物提高：）

我只是改变了它，像这样：

的

行为：

 ; 
使用System.Collections.Generic; 
使用System.Text;使用System.Windows 
;使用System.Windows.Controls的
; 
使用System.Windows.Data;使用System.Windows.Documents 
; 
使用System.Windows.Input;使用System.Windows.Media 
; 
使用System.Windows.Media.Imaging;使用System.Windows.Shapes 
; 
使用System.Windows.Interactivity; 
使用System.Security; 
 
命名空间Knerd.Behaviors {
公共类PasswordChangedBehavior：行为< PasswordBox> {
 
保护覆盖无效OnAttached（）{
 AssociatedObject.PasswordChanged + = AssociatedObject_PasswordChanged; 
 base.OnAttached（）; 
} 
 
私人无效AssociatedObject_PasswordChanged（对象发件人，RoutedEventArgs E）{
如果（AssociatedObject.SecurePassword！= NULL）
 AssociatedObject.DataContext = AssociatedObject.SecurePassword.Copy （）; 
} 
 
保护覆盖无效OnDetaching（）{
 AssociatedObject.PasswordChanged  -  = AssociatedObject_PasswordChanged; 
 base.OnDetaching（）; 
} 
 
 //使用的DependencyProperty作为后备存储TargetPassword。这使得动画，造型，绑定等等... 
公共静态只读的DependencyProperty TargetPasswordProperty = DependencyProperty.Register（TargetPassword的typeof（SecureString的）的typeof（PasswordChangedBehavior），新PropertyMetadata（默认值（SecureString的）））; 
} 
} 
  

的

视图模型根本没有改变，但这里是我的查看：

 < PasswordBox Grid.Column =1Grid.Row =1保证金=5WIDTH =300了minWidth =200的DataContext ={绑定密码，模式=双向}> 
< I：Interaction.Behaviors> 
<行为：PasswordChangedBehavior /> 
< /我：Interaction.Behaviors> 
< / PasswordBox> 
  

这工作得尽善尽美，不会暴露明文密码。

I try to bind the SecurePassword property of a PasswordBox to my ViewModel with a custom Behavior. Sadly it doesn't work properly.

Basically I added a property to the Behavior which contains the target property of my ViewModel.

Any ideas why it doesn't work?

PS: I am currently on the way home without my laptop, I gonna update the question with my code in about 15 minutes. But would be nice if someone would post ideas or sth.

EDIT

As I promised, here is some code :)

The Behavior first:

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using System.Windows.Interactivity;
using System.Security;

namespace Knerd.Behaviors {
    public class PasswordChangedBehavior : Behavior<PasswordBox> {

        protected override void OnAttached() {
            AssociatedObject.PasswordChanged += AssociatedObject_PasswordChanged;
            base.OnAttached();
        }

        private void AssociatedObject_PasswordChanged(object sender, RoutedEventArgs e) {
            if (AssociatedObject.Password != null)
                TargetPassword = AssociatedObject.SecurePassword;
        }

        protected override void OnDetaching() {
            AssociatedObject.PasswordChanged -= AssociatedObject_PasswordChanged;
            base.OnDetaching();
        }

        public SecureString TargetPassword {
            get { return (SecureString)GetValue(TargetPasswordProperty); }
            set { SetValue(TargetPasswordProperty, value); }
        }

        // Using a DependencyProperty as the backing store for TargetPassword.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty TargetPasswordProperty = DependencyProperty.Register("TargetPassword", typeof(SecureString), typeof(PasswordChangedBehavior), new PropertyMetadata(default(SecureString)));
    }
}

The PasswordBox:

<PasswordBox Grid.Column="1" Grid.Row="1" Margin="5" Width="300" MinWidth="200">
    <i:Interaction.Behaviors>
        <behaviors:PasswordChangedBehavior TargetPassword="{Binding Password}" />
    </i:Interaction.Behaviors>
</PasswordBox>

And last, the part of my ViewModel.

private SecureString password;

public SecureString Password {
    get { return password; }
    set {
        if (password != value) {
            password = value;
            OnPropertyChanged("Password");
        }
    }
}

I hope anyone can help, atm I use the codebehind version but I rather wouldn't.

EDIT 2

What actually doesn't work is, that the TargetPassword property doesn't update the property of my ViewModel

解决方案

I think I found a kinda weird solution. Please improve if there is sth to improve :)

I just changed it like so:

The Behavior:

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using System.Windows.Interactivity;
using System.Security;

namespace Knerd.Behaviors {
    public class PasswordChangedBehavior : Behavior<PasswordBox> {

        protected override void OnAttached() {
            AssociatedObject.PasswordChanged += AssociatedObject_PasswordChanged;
            base.OnAttached();
        }

        private void AssociatedObject_PasswordChanged(object sender, RoutedEventArgs e) {
            if (AssociatedObject.SecurePassword != null)
                AssociatedObject.DataContext = AssociatedObject.SecurePassword.Copy();
        }

        protected override void OnDetaching() {
            AssociatedObject.PasswordChanged -= AssociatedObject_PasswordChanged;
            base.OnDetaching();
        }

        // Using a DependencyProperty as the backing store for TargetPassword.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty TargetPasswordProperty = DependencyProperty.Register("TargetPassword", typeof(SecureString), typeof(PasswordChangedBehavior), new PropertyMetadata(default(SecureString)));
    }
}

The ViewModel didn't change at all, but here is my View:

<PasswordBox Grid.Column="1" Grid.Row="1" Margin="5" Width="300" MinWidth="200" DataContext="{Binding Password, Mode=TwoWay}">
    <i:Interaction.Behaviors>
        <behaviors:PasswordChangedBehavior />
    </i:Interaction.Behaviors>
</PasswordBox>

That works just perfect, without exposing the plaintext password.

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