Windows Phone 7 MVVM 데이터 바인딩 양식

Question

저는 Windows Phone Development를 처음 사용하며 현재 간단한 양식을 가지고 있습니다. MVVM 패턴과 MvvmLight를 사용하여 명령을 실행하고 있습니다. "신청자"엔티티는 항상 비어 있으며 데이터 바인딩이 작동하지 않는 2 가지 방법처럼 보입니다. 여기 내 코드가 있습니다, 나는 누군가가 올바른 방향으로 나를 가리킬 수 있기를 바랍니다.

보기

<Grid x:Name="LayoutRoot" Background="Transparent" DataContext="{Binding Applicant}"> 
    <Grid.RowDefinitions> 
     <RowDefinition Height="Auto"/> 
     <RowDefinition Height="*"/> 
    </Grid.RowDefinitions> 

    <!--TitlePanel contains the name of the application and page title--> 
    <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28"> 
     <TextBlock x:Name="ApplicationTitle" Text="MY APPLICATION" Style="{StaticResource PhoneTextNormalStyle}"/> 
     <TextBlock x:Name="PageTitle" Text="create account" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/> 
    </StackPanel> 

    <!--ContentPanel - place additional content here--> 
    <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0"> 
     <StackPanel> 
      <StackPanel> 
       <TextBlock FontSize="15" TextWrapping="Wrap" Margin="0,0,0,10" Text="Please register to create your applicant account. No information will be passed to third parties for any reason."></TextBlock> 
      </StackPanel> 
      <StackPanel Orientation="Horizontal"> 
       <TextBlock VerticalAlignment="Center" Text="Forename" Width="100"></TextBlock> 
       <TextBox Width="350" BorderBrush="Red" DataContext="{Binding Forename, Mode=TwoWay}"></TextBox> 
      </StackPanel> 
      <StackPanel Orientation="Horizontal"> 
       <TextBlock VerticalAlignment="Center" Text="Surname" Width="100"></TextBlock> 
       <TextBox Width="350" x:Name="Surname" BorderBrush="Red" DataContext="{Binding Surname, Mode=TwoWay}"></TextBox> 
      </StackPanel> 
      <StackPanel Orientation="Horizontal"> 
       <TextBlock VerticalAlignment="Center" Text="Email" Width="100"></TextBlock> 
       <TextBox Width="350" x:Name="EmailAddress" BorderBrush="Red" DataContext="{Binding EmailAddress, Mode=TwoWay}"></TextBox> 
      </StackPanel> 
      <StackPanel Orientation="Horizontal"> 
       <TextBlock VerticalAlignment="Center" Text="Password" Width="100"></TextBlock> 
       <PasswordBox Width="350" x:Name="PassPhrase" BorderBrush="Red" DataContext="{Binding PassPhrase, Mode=TwoWay}"></PasswordBox> 
      </StackPanel> 
      <StackPanel Orientation="Horizontal"> 
       <TextBlock VerticalAlignment="Center" Text="City" Width="100"></TextBlock> 
       <TextBox Width="350" x:Name="City" DataContext="{Binding City, Mode=TwoWay}"></TextBox> 
      </StackPanel> 
      <StackPanel Orientation="Horizontal"> 
       <TextBlock VerticalAlignment="Center" Text="State" Width="100"></TextBlock> 
       <TextBox Width="350" x:Name="County" DataContext="{Binding County, Mode=TwoWay}"></TextBox> 
      </StackPanel> 
      <StackPanel Orientation="Horizontal"> 
       <TextBlock VerticalAlignment="Center" Text="Country" Width="100"></TextBlock> 
       <TextBox Width="350" x:Name="Country" DataContext="{Binding Country, Mode=TwoWay}"></TextBox> 
      </StackPanel> 
      <StackPanel> 
       <Button Name="btnContact" 
         Content="Register" 
         DataContext="{Binding ElementName=this, Path=DataContext}" 
         Command="{Binding SaveApplicantCommand}" 
         Width="300"/> 
      </StackPanel> 
     </StackPanel> 
    </Grid> 
</Grid> 

보기 코드

protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e) 
    { 
     base.OnNavigatedTo(e); 

     ApplicantViewModel vm = new ApplicantViewModel(); 
     DataContext = vm; 
    } 

보기 모델

public class ApplicantViewModel : ViewModelBase 
{ 
    public ApplicantViewModel() 
    { 
     SaveApplicantCommand = new RelayCommand(SaveApplicant); 
     Applicant = new Applicant(); 
    } 

    public ICommand SaveApplicantCommand {get; set;} 

    void SaveApplicant() 
    { 
     if (string.IsNullOrEmpty(Applicant.Forename)) 
     { 
      MessageBox.Show("Please enter a forename", "Oops...", MessageBoxButton.OK); 
      return; 
     } 

     db.AddObject("Applicants", Applicant); 
     db.BeginSaveChanges(OnChangesSaved, db); 
    } 

    void OnChangesSaved(IAsyncResult result) 
    { 

    } 

    private Applicant _applicant; 
    public Applicant Applicant 
    { 
     get 
     { 
      return _applicant; 
     } 
     set 
     { 
      if (_applicant != value) 
      { 
       _applicant = value; 
       RaisePropertyChanged("Applicant"); 
      } 
     } 
    } 
} 

,536을 (뷰 모델에서 INotifyPropertyChanged를 구현 ViewModelBase에서 상속) 뒤에

Forename 텍스트 상자에 입력되는 내용은 모두 Forename이 null이므로 항상 오류 메시지가 표시됩니다.

** ** * UPDATE * ** *** ** * 여기

모델의 특성이다 뒤따라야

[System.CodeDom.Compiler.GeneratedCodeAttribute("System.Data.Services.Design", "1.0.0")] 
    public string Forename 
    { 
     get 
     { 
      return this._Forename; 
     } 
     set 
     { 
      this.OnForenameChanging(value); 
      this._Forename = value; 
      this.OnForenameChanged(); 
      this.OnPropertyChanged("Forename"); 
     } 
    } 

Answer 1

ApplicantViewModel에는 Forename 속성이 없습니다. 신청자 만이 있습니다. 따라서 다음을 수행하십시오.

<TextBox Width="350" BorderBrush="Red" 
     DataContext="{Binding Applicant.Forename, Mode=TwoWay}"/> 

다른 텍스트 상자와 동일하게하십시오.