BindingMode.TwoWay不适用于UserControl（不更新源属性）

Question

我已经创建了包含TextBox和PasswordBox的自定义用户控件。它绑定完全工作，但是当我更改TextBox或用户控件的PasswordBox内的任何值，然后我的源属性不刷新。

以下是代码为我的自定义用户控件

RestrictedBox.xaml

<UserControl.Resources> 
     <Converters:EnumToVisibilityConverter x:Key="enumToVisibilityConverter" /> 
     <Converters:EnumToVisibilityConverterReverse x:Key="enumToVisibilityConverterReverse" /> 
    </UserControl.Resources> 
    <Grid x:Name="LayoutRoot" Background="Transparent" > 
     <StackPanel> 
      <TextBox x:Name="txtTextBox" Width="50" Height="25" /> 
      <PasswordBox x:Name="txtPasswordBox" Width="50" Height="25" /> 
     </StackPanel> 
    </Grid> 

RestrictedBox.xaml.cs

public partial class RestrictedBox : UserControl 
    { 
     public RestrictedBox() 
     { 
      InitializeComponent(); 
      txtTextBox.SetBinding(TextBox.TextProperty, new Binding { Source = this, Path = new PropertyPath("Value"), Mode = BindingMode.TwoWay }); 
      txtTextBox.SetBinding(TextBox.VisibilityProperty, new Binding("Type") 
       { 
        Source = this, 
        Converter = new EnumToVisibilityConverter() 
       }); 
      txtPasswordBox.SetBinding(PasswordBox.PasswordProperty, new Binding { Source = this, Path = new PropertyPath("Value"), Mode = BindingMode.TwoWay }); 
      txtPasswordBox.SetBinding(TextBox.VisibilityProperty, new Binding("Type") 
      { 
       Source = this, 
       Converter = new EnumToVisibilityConverterReverse() 
      }); 
     } 
     public string Value 
     { 
      get { return (string)GetValue(ValueProperty); } 
      set { SetValue(ValueProperty, value); } 
     } 
     public static readonly DependencyProperty ValueProperty = DependencyProperty.Register("Value", typeof(string), typeof(RestrictedBox), new PropertyMetadata("", ValueChanged)); 
     private static void ValueChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) 
     { 
     } 
     public Mode Type 
     { 
      get { return (Mode)GetValue(TypeProperty); } 
      set { SetValue(TypeProperty, value); } 
     } 
     public static readonly DependencyProperty TypeProperty = DependencyProperty.Register("Type", typeof(Mode), typeof(RestrictedBox), new PropertyMetadata(Mode.Text, TypeChanged)); 
     private static void TypeChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) 
     { 
     } 
    } 

弗洛wing是我使用自定义用户控件（RestrictedBox）的LoginView代码。

LoginView.xaml

<control:RestrictedBox Type="Text" Value="{Binding Path=UserName}" /> 

LoginView.xaml.cs

[Export(typeof(LoginView))] 
    [PartCreationPolicy(CreationPolicy.NonShared)] 
    public partial class LoginView : UserControl, IPageTitle 
    { 
     #region Constuctors 
     public LoginView() 
     { 
      InitializeComponent(); 
     } 
     [Import] 
     public LoginViewModel ViewModel 
     { 
      get 
      { 
       return this.DataContext as LoginViewModel; 
      } 
      set 
      { 
       DataContext = value; 
      } 
     } 
     #endregion 
} 

LoginViewModel.cs

[Export] 
[PartCreationPolicy(CreationPolicy.NonShared)] 
public class LoginViewModel : INotifyPropertyChanged, IRegionMemberLifetime 
{ 
    private string _UserName = ""; 
    public string UserName 
    { 
     get { return _UserName; } 
     set 
     { 
      _UserName = value; 
      OnPropertyChanged("UserName"); 
     } 
    } 
    [ImportingConstructor] 
    public LoginViewModel(IEventAggregator eventAggregator, IRegionManager regionManager) 
    { 
    } 
} 

请帮我解决这个问题，因为我试图解决自1.5天以来没有任何运气。

您的意见和建议将不胜感激。

注意： -我能够将UserName的值绑定到TextBox，但我更新TextBox并单击提交我无法从TextBox获取更新的值。

感谢，

Imdadhusen

Answer 1

你缺少模式=双向你LoginView.xaml：

<control:RestrictedBox Type="Text" Value="{Binding Path=UserName,Mode=TwoWay}" />