ListBox ItemSsource 绑定从未知原因请求依赖属性

Question

您好，我有以下用户控件。 可以注意到在第二个 HierarchicalDataTemplate 中还包含一个 ListBox。

我希望 ListBox ItemsSource 绑定到 viewModel 中的字段，即 CurrentPropertyValues。

当我尝试在主窗口或树外绑定它时，它可以工作，（只是 ItemsSource="{Binding CurrentPropertyValues}"）

我尝试了各种方法使其在 HierarchicalDataTemplate 中工作（它具有不同的数据上下文），但我一直失败。

感谢您的帮助！

<UserControl x:Class="RidaDiff2.Views.LeftTreeControl"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         xmlns:converters="clr-namespace:RidaDiff2.Converters"
         xmlns:model="clr-namespace:RidaDiff2.Model"
         xmlns:viewModel="clr-namespace:RidaDiff2.ViewModels"
         xmlns:views="clr-namespace:RidaDiff2.Views"
         mc:Ignorable="d" 
         d:DesignHeight="300" d:DesignWidth="300">
<UserControl.Resources>
    <converters:EnumToPicConverter x:Key="Converter" />
    <HierarchicalDataTemplate DataType="{x:Type model:TreeNode}" ItemsSource="{Binding ChildListNodes}" x:Key="NotSelected">
        <StackPanel Orientation="Horizontal">
            <Image Source="{Binding Path=EntityType,Converter={StaticResource Converter}}" />
            <TextBlock Margin="5,0" Text="{Binding Name1}" />
            <!--"{Binding ItemName, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" -->
        </StackPanel>
    </HierarchicalDataTemplate>
    <HierarchicalDataTemplate DataType="{x:Type model:TreeNode}" ItemsSource="{Binding ChildListNodes}" x:Key="Selected">
        <StackPanel Orientation="Vertical">
            <StackPanel Orientation="Horizontal">
                <Image Source="{Binding Path=EntityType,Converter={StaticResource Converter}}" />
                <TextBlock Margin="5,0" Text="{Binding Name1}" />
            </StackPanel>
            <ListBox DataContext="viewModel:TreeViewModel" Height="300" Width="100"  ItemsSource="{Binding Path=(viewModel:TreeViewModel.CurrentPropertyValues), Mode=TwoWay}" ></ListBox>
        </StackPanel>
    </HierarchicalDataTemplate>
</UserControl.Resources>
<views:ExtendedTreeView x:Name="Tree"  ScrollViewer.VerticalScrollBarVisibility="Auto" ItemsSource="{Binding RootNode}" SelectedItem_="{Binding CurrentCouple,Mode=TwoWay}">
    <views:ExtendedTreeView.ItemContainerStyle>
        <Style TargetType="{x:Type TreeViewItem}">
            <Setter Property="IsExpanded" Value="{Binding Path=(model:TreeNode.IsExpanded), Mode=TwoWay}" />
            <Setter Property="Background" Value="{Binding Path=(model:TreeNode.BackgroundColor), Mode=TwoWay}" />
            <Setter Property="IsSelected" Value="{Binding Path=(model:TreeNode.IsSelected), Mode=TwoWay}"></Setter>
            <Setter Property="HeaderTemplate" Value="{StaticResource NotSelected}"/>
            <Style.Triggers>
                <Trigger Property="IsSelected" Value="True">
                    <Setter Property="HeaderTemplate" Value="{StaticResource Selected}"/>
                </Trigger>
            </Style.Triggers>
        </Style>

    </views:ExtendedTreeView.ItemContainerStyle>
</views:ExtendedTreeView>

Answer 1

如果CurrentPropertyValues 是TreeViewModel 的属性，那么您可以使用RelativeSource 绑定并在可视化树上找到TreeView 并将ItemsSource 绑定到其DataContext 的属性：

<ListBox 
    Height="300" 
    Width="100"  
    ItemsSource="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type TreeView}}, Path=DataContext.CurrentPropertyValues}" />