WPF：TreeView和嵌套模板

Question

我想顯示一個使用樹視圖的類，但沒有顯示。我使用Snoop檢查了容器，並且看到了StackPanel，但它是空的，即使項目確實有標題和頁面。沒有綁定錯誤，我不知道爲什麼它不起作用。

public class Project : INotifyPropertyChanged { 
     public string Title {get;set;} 
     public ObservableCollection<InfoPage> Pages {get;set;} 
    ... 

public class InfoPage : INotifyPropertyChanged { 
     public string Title {get;set;} 
     public ObservableCollection<InfoPage> Pages {get;set;} 
    ... 

<HierarchicalDataTemplate x:Key="ProjectPageTemplate" ItemsSource="{Binding Pages}"> 
    <TextBlock Text="{Binding Title}" TextWrapping="Wrap" TextTrimming="CharacterEllipsis"/> 
</HierarchicalDataTemplate> 
<HierarchicalDataTemplate x:Key="ProjectTemplate" ItemsSource="{Binding Pages}"> 
    <StackPanel> 
     <TextBlock Grid.Row="0" Grid.Column="1" Text="{Binding Title}" TextWrapping="Wrap" TextTrimming="CharacterEllipsis"/> 
    </StackPanel> 
    <HierarchicalDataTemplate.ItemTemplate> 
     <HierarchicalDataTemplate> 
      <TextBlock Text="{Binding Title}" TextWrapping="Wrap" TextTrimming="CharacterEllipsis"/> 
     </HierarchicalDataTemplate> 
    </HierarchicalDataTemplate.ItemTemplate> 
</HierarchicalDataTemplate> 

然後在窗口本身：

public static DependencyProperty ProjectProperty = DependencyProperty.Register("Project", typeof(Project), typeof(WinMain)); 
public Project Project { 
    get { return base.GetValue(ProjectProperty) as Project; } 
    set { base.SetValue(ProjectProperty, value); } 
} 

<TreeView x:Name="trePages" Grid.Row="2" Grid.Column="0" ItemsSource="{Binding Project,ElementName=root,Converter={StaticResource dbg},Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" ItemTemplate="{StaticResource ProjectTemplate}"/> 

Answer 1

我懷疑它有事情做與嵌套在ProjectTemplate海爾-數據TEMPL。

只是將你的源代碼複製到一個空白的項目中，並玩了一下。以下是對我有用的東西。

<Window.Resources> 
     <HierarchicalDataTemplate x:Key="ProjectItemTemplate" ItemsSource="{Binding Pages}"> 
     <TextBlock Text="{Binding Title}" TextWrapping="Wrap" TextTrimming="CharacterEllipsis" Foreground="Red"/> 
     </HierarchicalDataTemplate> 
     <HierarchicalDataTemplate x:Key="ProjectTemplate" ItemsSource="{Binding Pages}" ItemTemplate="{StaticResource ProjectItemTemplate}"> 
     <StackPanel> 
      <TextBlock Text="{Binding Title}" TextWrapping="Wrap" TextTrimming="CharacterEllipsis"/> 
     </StackPanel> 
     </HierarchicalDataTemplate> 

    </Window.Resources> 
    <Grid> 
     <TreeView x:Name="trePages" ItemsSource="{Binding Projects}" ItemTemplate="{StaticResource ProjectTemplate}" /> 
    </Grid>