Listbox ItemsSource et DataContext ne sont pas liés dans Silverlight 3

Question

J'ai une page de navigation xaml avec 5 zones de liste (Silverlight 3). Quatre des zones de liste (les listes d'état) lient correctement les propriétés ItemsSource et DataContext, mais pas l'une (la liste principale). Que je fasse les liaisons dans xaml ou directement dans le code-behind (juste pour tester), ItemsSource et DataContext restent null pour cette liste. Voici le xaml et le code dans mon ViewModel. Des idées?

PersonPage.xaml

<navigation:Page x:Class="PersonTracker.Views.PersonPage" 
      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" 
      xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation" 
      xmlns:viewModel="clr-namespace:PersonTracking.ViewModels;assembly=PersonTracking" 
      d:DesignWidth="640" d:DesignHeight="480" 
      Title="Person Page"> 
    <navigation:Page.Resources> 
     <viewModel:PersonPageViewModel x:Key="TheViewModel" d:IsDataSouce="True" /> 
     <DataTemplate x:Key="PersonMasterDataTemplate"> 
     <Grid d:DesignWidth="187" d:DesignHeight="42" Width="318" Height="23"> 
      <Grid.ColumnDefinitions> 
       <ColumnDefinition Width="0.119*"/> 
       <ColumnDefinition Width="0.214*"/> 
       <ColumnDefinition Width="0.667*"/> 
      </Grid.ColumnDefinitions> 
      <TextBlock Text="{Binding Code}" TextWrapping="Wrap" d:LayoutOverrides="Width, Height" Grid.Column="0"/> 
      <TextBlock Text="{Binding LastName}" TextWrapping="Wrap" d:LayoutOverrides="Width, Height" Grid.Column="1"/> 
      </Grid> 
     </DataTemplate> 
     <DataTemplate x:Key="PersonSimpleDataTemplate" > 
      <StackPanel Width="100" Height="100"> 
       <TextBlock Text="{Binding LastName}" /> 
      </StackPanel> 
     </DataTemplate> 
    </navigation:Page.Resources> 
    <Grid x:Name="LayoutRoot"> 
     <Grid x:Name="ContentGrid" ShowGridLines="True"> 
      <Grid.ColumnDefinitions> 
       <ColumnDefinition Width="200" /> 
       <ColumnDefinition Width="Auto" /> 
       <ColumnDefinition Width="Auto" /> 
       <ColumnDefinition Width="Auto" /> 
       <ColumnDefinition Width="Auto" /> 
       <ColumnDefinition Width="*" /> 
      </Grid.ColumnDefinitions> 

      <Grid.RowDefinitions> 
       <RowDefinition Height="Auto" /> 
       <RowDefinition Height="*" /> 
      </Grid.RowDefinitions> 

      <StackPanel Grid.Column="0" Grid.Row="0" Grid.RowSpan="2" > 
       <TextBlock Text="Legend" TextAlignment="Center" /> 
       <ListBox x:Name="PersonMasterList" ItemTemplate="{StaticResource PersonMasterDataTemplate}" ItemsSource="{Binding}" DataContext="{Binding Path=MasterPersons, Source={StaticResource TheViewModel}}" /> 
      </StackPanel> 

      <StackPanel Grid.Column="1" Grid.Row="0" > 
       <TextBlock Text="Sleeping" TextAlignment="Center" /> 
       <ListBox x:Name="SleepingList" ItemTemplate="{StaticResource PersonSimpleDataTemplate}" ItemsSource="{Binding}" DataContext="{Binding Path=SleepingPersons, Source={StaticResource TheViewModel}}" /> 
      </StackPanel> 

      <StackPanel Grid.Column="2" Grid.Row="0" > 
       <TextBlock Text="Eating" TextAlignment="Center" /> 
       <ListBox x:Name="EatingList" ItemTemplate="{StaticResource PersonSimpleDataTemplate}" ItemsSource="{Binding}" DataContext="{Binding Path=EatingPersons, Source={StaticResource TheViewModel}}" /> 
      </StackPanel> 

      <StackPanel Grid.Column="3" Grid.Row="0" > 
        <TextBlock Text="Driving" TextAlignment="Center" /> 
        <ListBox x:Name="DrivingList" ItemTemplate="{StaticResource PersonSimpleDataTemplate}" ItemsSource="{Binding}" DataContext="{Binding Path=DrivingPersons, Source={StaticResource TheViewModel}}" /> 
      </StackPanel> 

      <StackPanel Grid.Column="4" Grid.Row="0" > 
       <TextBlock Text="Working" TextAlignment="Center" /> 
       <ListBox x:Name="WorkingList" ItemTemplate="{StaticResource PersonSimpleDataTemplate}" ItemsSource="{Binding}" DataContext="{Binding Path=WorkingPersons, Source={StaticResource TheViewModel}}" /> 
      </StackPanel> 
     </Grid> 
    </Grid> 
</navigation:Page> 

Person.cs

public class Person : INotifyPropertyChanged 
    { 
     public event PropertyChangedEventHandler PropertyChanged; 

     public int PersonID { get; set; } 

     private string code; 
     public string Code 
     { 
      get { return code; } 
      set 
      { 
       code = value; 
       OnPropertyChanged("Code"); 
      } 
     } 

     private string lastName; 
     public string LastName 
     { 
      get { return lastName; } 
      set 
      { 
       lastName = value; 
       OnPropertyChanged("LastName"); 
      } 
     } 

     private void OnPropertyChanged(string property) 
     { 
      if (PropertyChanged != null) 
      { 
       PropertyChanged(this, new PropertyChangedEventArgs(property)); 
      } 
     } 
    } 
} 

PersonPageViewModel.cs

public class PersonPageViewModel 
{ 
     private ObservableCollection<Person> masterPersons; 
     public ObservableCollection<Person> MasterPersons 
     { 
      get 
      { 
       return masterPersons; 
      } 
     } 

     private ObservableCollection<Person> sleepingPersons = new ObservableCollection<Person>(); 
     public ObservableCollection<Person> SleepingPersons   { 
      get 
      { 
       return sleepingPersons; 
      } 
     } 

     private ObservableCollection<Person> eatingPersons = new ObservableCollection<Person>(); 
     public ObservableCollection<Person> EatingPersons 
     { 
      get 
      { 
       return eatingPersons; 
      } 
     } 

     private ObservableCollection<Person> drivingPersons = new ObservableCollection<Person>(); 
     public ObservableCollection<Person> DrivingPersons 
     { 
      get 
      { 
       return drivingPersons; 
      } 
     } 

     private ObservableCollection<Person> workingPersons = new ObservableCollection<Person>(); 
     public ObservableCollection<Person> WorkingPersons 
     { 
      get 
      { 
       return workingPersons; 
      } 
     } 

     public void LoadPeople() 
     { 
      // Get people from database 
      // Add all people to master list 
      // Add people to other lists based on status 
     } 
} 

Answer 1

Eh bien, en regardant votre code, en PersonPageViewModel, vous créez ObservableCollection<Person>() pour tous les variables sauf le personMasterList

Cela pourrait très bien être votre problème.