WPF：TreeView 和嵌套模板

Question

我正在尝试使用树视图显示一个类，但没有显示任何内容。我用 Snoop 检查了容器，我看到了 StackPanel，但它是空的，即使项目确实有标题和页面。没有绑定错误，我不知道为什么它不起作用。

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>

然后在窗口本身：

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

我怀疑这与 ProjectTemplate 中嵌套的 Hier-data-templ 有关。

刚刚将您的源代码复制到一个空白项目中并玩弄了一下。这对我有用。

<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>