如何訪問xaml集合中的基本datacontext

Question

我有一個wpf應用程序，並將datacontext設置爲viewmodel類的實例。這一切都正常工作，除非我需要訪問列表框中的視圖模型的屬性，並將datacontext設置爲包含在ViewModel類中的集合。在MSDN上它說，你可以使用\字符逃跑，但還沒有在window1.xaml.cs

//instantiate the view model 
StatusBoardViewModel statusBoardViewModel = new StatusBoardViewModel(); 

    public Window1() 
    { 
     InitializeComponent(); 
     // setting the datacontext 
     this.DataContext = statusBoardViewModel; 
    } 

而XAML中工作對我來說

我的代碼

public class StatusBoardViewModel : INotifyPropertyChanged 
    { 
    OIConsoleDataContext db = new OIConsoleDataContext(); 

    // the collection 
    private IQueryable<Issue> issues; 
    public IQueryable<Issue> Issues 
    { 
     get 
     { 
      // Lazy load issues if they have not been instantiated yet 
      if (issues == null) 
       QueryIssues(); // This just runs a linq query to set the property 
      return issues; 
     } 
     set 
     { 
      if (issues != value) 
      { 
       issues = value; 
       OnPropertyChanged("Issues"); 
      } 
     } 
    } 
    // The property I need to access 
    private bool showDetailListItems = true; 
    public bool ShowDetailListItems 
    { 
     get 
     { 
      return showDetailListItems; 
     } 
     set 
     { 
      if (showDetailListItems != value) 
      { 
       showDetailListItems = value; 
       OnPropertyChanged("ShowDetailListItems"); 
      } 
     } 
    } 
} 

// This is in the Window1.xaml file 
    <ListBox x:Name="IssueListBox" 
       ItemsSource="{Binding Issues}" // Binds the listbox to the collection in the ViewModel 
       ItemTemplate="{StaticResource ShowIssueDetail}" 
       IsSynchronizedWithCurrentItem="True" 
       HorizontalContentAlignment="Stretch" BorderThickness="3" 
       DockPanel.Dock="Top" VerticalContentAlignment="Stretch" 
       Margin="2" MinHeight="50" /> 

// The datatemplate from the app.xaml file 
    <DataTemplate x:Key="ShowIssueDetail"> 
     <Border CornerRadius="3" Margin="2" MinWidth="400" BorderThickness="2" 
       BorderBrush="{Binding Path=IssUrgency, Converter={StaticResource IntToRYGBBoarderBrushConverter}}"> 
      <StackPanel Orientation="Vertical"> 
       <TextBlock Text="{Binding Path=IssSubject}" Margin="3" FontWeight="Bold" FontSize="14"/> 

       <!--DataTrigger will collapse following panel for simple view--> 
       <StackPanel Name="IssueDetailPanel" Visibility="Visible" Margin="3">      
        <StackPanel Width="Auto" Orientation="Horizontal"> 
         <TextBlock Text="Due: " FontWeight="Bold"/> 
         <TextBlock Text="{Binding Path=IssDueDate}" FontStyle="Italic" HorizontalAlignment="Left"/> 
        </StackPanel> 
        <StackPanel Width="Auto" Orientation="Horizontal"> 
         <TextBlock Text="Category: " FontWeight="Bold"/> 
         <TextBlock Text="{Binding Path=IssCategory}"/> 
        </StackPanel> 
       </StackPanel> 

      </StackPanel> 
     </Border> 

     // This is where I have the issue, ShowDetailListItems is in the base class, not the collection 
     <DataTemplate.Triggers> 
      <DataTrigger Binding="{Binding Path=ShowDetailListItems, Mode=TwoWay}" Value="False"> 
       <Setter TargetName="IssueDetailPanel" Property="Visibility" Value="Collapsed"/> 
      </DataTrigger> 
     </DataTemplate.Triggers> 
    </DataTemplate> 

我已經學會了TON這樣做，但這個當前問題是驅動我batty，沒有運氣與谷歌，MSDN，SO或一個幾本書

我以爲我會添加這個筆記：我正在學習這個爲了爲我的業務構建一些應用程序，我是一個在wpf和xaml中的初學者，所以我改變了這可能是件愚蠢的事情。我真的很想找到一個關於datacontexts的好教程，因爲我發現十幾個不同的「How To's」完全不同。我知道在我的知識中有一些大的漏洞，因爲當我嘗試在代碼隱藏文件Window1.xaml和app.xaml文件中創建對我的datacontext的引用時，我總是會收到viewmodel類的多個實例。

Answer 1

您是否嘗試過其中之一？

{Binding Path=ShowDetailListItems, ElementName=YourWindowName} 

或

{Binding ShowDetailListItems, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}}