自定义控件中不显示Silverlight IDataErrorInfo消息'；s文本框

我创建了一个自定义密码框用户控件，可以显示和隐藏密码。它只是将标准密码框与绑定到相同密码字符串属性的文本框交换。这一切都很好，但现在我的数据验证错误不再显示，尽管它们是在后台正确生成的。以下是来自我的用户控件的xaml：

<UserControl x:Class="Controls.EAPPasswordBox"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="400" x:Name="_root">

<Grid x:Name="LayoutRoot" Background="White">
    <StackPanel HorizontalAlignment="Stretch" VerticalAlignment="Top">
        <PasswordBox x:Name="pwdBox" Password="{Binding Password, Mode=TwoWay,ValidatesOnDataErrors=True}" />
        <TextBox x:Name="txtBox" Text="{Binding Password, Mode=TwoWay,ValidatesOnDataErrors=True}" />
    </StackPanel>
</Grid>

现在，当我在“自定义密码”框中输入文本时，验证逻辑会被调用，但不会显示。我必须为此调整我的用户控件吗

编辑：这是我的密码箱背后的代码：

public partial class EAPPasswordBox : UserControl, INotifyPropertyChanged
{
    public bool ShowText
    {

        get { return (bool)GetValue(ShowTextProperty); }
        set { 

            SetValue(ShowTextProperty, value);
               if (value == true)
               {
                   this.pwdBox.Visibility = System.Windows.Visibility.Collapsed;
                   this.txtBox.Visibility = System.Windows.Visibility.Visible;
               }
               else
               {
                   this.pwdBox.Visibility = System.Windows.Visibility.Visible;
                   this.txtBox.Visibility = System.Windows.Visibility.Collapsed;
               }
        }

    }

    public string Password
    {
        get { return (string)GetValue(PasswordProperty); }
        set { SetValue(PasswordProperty, value); }
    }

    private Visibility _PwdBoxVisibility;

    public Visibility PwdBoxVisibility
    {
        get { return _PwdBoxVisibility; }
        set
        {
            _PwdBoxVisibility = value; NotifyPropertyChanged("PwdBoxVisibility");
        }
    }

    private Visibility _TxtBoxVisibility;

    public Visibility TxtBoxVisibility
    {
        get { return _TxtBoxVisibility; }
        set
        {
            _TxtBoxVisibility = value; NotifyPropertyChanged("TxtBoxVisibility");
        }
    }

    public static readonly DependencyProperty PasswordProperty =
         DependencyProperty.Register("Password", typeof(string), typeof(EAPPasswordBox), null);

    public static readonly DependencyProperty ShowTextProperty =
         DependencyProperty.Register("ShowText", typeof(bool), typeof(EAPPasswordBox), new PropertyMetadata(OnShowTextPropertyChanged));

    public EAPPasswordBox()
    {
        InitializeComponent();
        this.pwdBox.SetBinding(PasswordBox.PasswordProperty, new System.Windows.Data.Binding() { Source = this, Path = new PropertyPath("Password"), Mode = BindingMode.TwoWay,ValidatesOnDataErrors=true });
        this.txtBox.SetBinding(TextBox.TextProperty, new System.Windows.Data.Binding() { Source = this, Path = new PropertyPath("Password"), Mode = BindingMode.TwoWay, ValidatesOnDataErrors=true });

        this.ShowText = false;
    }


    private static void OnShowTextPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        EAPPasswordBox passwordBox = d as EAPPasswordBox;

        if (passwordBox != null)
        {
            passwordBox.ShowText=(bool)e.NewValue;
        }

    }

    public event PropertyChangedEventHandler PropertyChanged;

    private void NotifyPropertyChanged(String info)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(info));
        }
    }


}

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第二次编辑：如果有人能在父窗口/控件的xaml中向我解释usercontrols绑定属性的基本知识，这也会有所帮助。我不太明白为什么usercontrol没有获得相应父视图viewmodel属性的属性更改事件，因为它是通过xaml绑定到这些属性的。

这是我最后的解决方案。因为我意识到用户控件的DataContext自动成为父视图的ViewModel，所以我完全放弃了Password dependency属性的绑定。我在控件中引入了一个新参数，该参数必须设置为父视图模型的password属性。然后，我使用这个字符串在控件的已加载事件中手动绑定文本框和密码框。这是我的密码：

public partial class EAPPasswordBox : UserControl, INotifyPropertyChanged
{
    public bool ShowText
    {

        get { return (bool)GetValue(ShowTextProperty); }
        set { 

            SetValue(ShowTextProperty, value);
               if (value == true)
               {
                   this.pwdBox.Visibility = System.Windows.Visibility.Collapsed;
                   this.txtBox.Visibility = System.Windows.Visibility.Visible;
               }
               else
               {
                   this.pwdBox.Visibility = System.Windows.Visibility.Visible;
                   this.txtBox.Visibility = System.Windows.Visibility.Collapsed;
               }
        }

    }

    public string PasswordPropertyName { get; set; }



    private Visibility _PwdBoxVisibility;

    public Visibility PwdBoxVisibility
    {
        get { return _PwdBoxVisibility; }
        set
        {
            _PwdBoxVisibility = value; NotifyPropertyChanged("PwdBoxVisibility");
        }
    }

    private Visibility _TxtBoxVisibility;

    public Visibility TxtBoxVisibility
    {
        get { return _TxtBoxVisibility; }
        set
        {
            _TxtBoxVisibility = value; NotifyPropertyChanged("TxtBoxVisibility");
        }
    }


    public static readonly DependencyProperty ShowTextProperty =
         DependencyProperty.Register("ShowText", typeof(bool), typeof(EAPPasswordBox), new PropertyMetadata(OnShowTextPropertyChanged));

    public EAPPasswordBox()
    {
        InitializeComponent();
        this.ShowText = false;
    }


    private static void OnShowTextPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        EAPPasswordBox passwordBox = d as EAPPasswordBox;

        if (passwordBox != null)
        {
            passwordBox.ShowText=(bool)e.NewValue;
        }

    }

    public event PropertyChangedEventHandler PropertyChanged;

    private void NotifyPropertyChanged(String info)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(info));
        }
    }

    private void _root_Loaded(object sender, RoutedEventArgs e)
    {
        this.pwdBox.SetBinding(PasswordBox.PasswordProperty, new System.Windows.Data.Binding() { Source = this.DataContext, Path = new PropertyPath(PasswordPropertyName), Mode = BindingMode.TwoWay, ValidatesOnDataErrors = true });
        this.txtBox.SetBinding(TextBox.TextProperty, new System.Windows.Data.Binding() { Source = this.DataContext, Path = new PropertyPath(PasswordPropertyName), Mode = BindingMode.TwoWay, ValidatesOnDataErrors = true });

    }


}

这是控件的XAML

<UserControl x:Class="GAB.EAP2011.Controls.EAPPasswordBox"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="400" x:Name="_root" Loaded="_root_Loaded">

<Grid x:Name="LayoutRoot" Background="White">
    <StackPanel HorizontalAlignment="Stretch" VerticalAlignment="Top">
        <PasswordBox x:Name="pwdBox"   />
        <TextBox x:Name="txtBox"   />
    </StackPanel>
</Grid>

以下是如何使用它：

<local:EAPPasswordBox x:Name="pwdBox"
                Grid.Column="1" Grid.Row="0" Grid.ColumnSpan="2" PasswordPropertyName="password" ShowText="{Binding showPassword,Mode=TwoWay}"></local:EAPPasswordBox>

现在您有了一个很好的密码可见性切换控件：）

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欢迎评论

我解决了这个问题，将加载事件中控件中的文本/pw框直接绑定到viewmodel的属性。我从父视图的xaml传递控件的普通公共属性的值，以标识要绑定到哪个密码属性。稍后将发布完整的答案。谢谢你的提问和答案。我已经按照你的想法实现了同样的想法，但是我仍然得到了一个错误。你能寄给我完整的代码样本吗？

<UserControl x:Class="GAB.EAP2011.Controls.EAPPasswordBox"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="400" x:Name="_root" Loaded="_root_Loaded">

<Grid x:Name="LayoutRoot" Background="White">
    <StackPanel HorizontalAlignment="Stretch" VerticalAlignment="Top">
        <PasswordBox x:Name="pwdBox"   />
        <TextBox x:Name="txtBox"   />
    </StackPanel>
</Grid>

<local:EAPPasswordBox x:Name="pwdBox"
                Grid.Column="1" Grid.Row="0" Grid.ColumnSpan="2" PasswordPropertyName="password" ShowText="{Binding showPassword,Mode=TwoWay}"></local:EAPPasswordBox>