如何使用基于 .Net 类属性的值自动更新 WPF TreeViewItems？

早上好。 我有一个类，其中包含从 InotifyPropertyChange 派生的数据。数据来自后台线程，该线程在特定位置搜索具有特定扩展名的文件。类的公共属性通过在单独的线程中更新数据来对事件 OnPropertyChange 做出反应。此外，还有基于HierarhicalDataTemplates的XAML TreeView描述。模板内的每个 TextBlock 提供 ItemsSource =“{Binding FoundFilePaths, Mode = OneWay, NotifyOnTargetUpdated = True}”。

 <TreeView  x:Name="FoundFiles_TreeView"  Opacity="15" Background="White"   BorderThickness="5" FontFamily="Arial" Margin="0,0,0,0" RenderTransformOrigin="0.5,0.5" VerticalAlignment="Top" Height="360" FontWeight="Bold" Foreground="#FF539DBE" TargetUpdated="FoundFiles_TreeView_TargetUpdated">
            <TreeView.ItemContainerStyle >
                <Style TargetType="{x:Type TreeViewItem}">
                    <Setter Property="TreeViewItem.Tag" Value="InfoNode" />
                    <Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
                    <Setter Property="Foreground" Value="Brown"/>
                    <Style.Triggers>
                        <Trigger Property="IsMouseCaptured" Value="True">
                            <Setter Property="IsSelected" Value="True"/>
                        </Trigger>
                    </Style.Triggers>
                </Style>
            </TreeView.ItemContainerStyle>
            <TreeView.Resources>
                <HierarchicalDataTemplate  DataType = "{x:Type lightvedo:FilesInfoStore}"  ItemsSource="{Binding FoundFilePaths, Mode=OneWay, NotifyOnTargetUpdated=True}">
                    <!--Здесь указываются узлы дерева-->
                    <StackPanel x:Name ="TreeNodeStackPanel" Orientation="Horizontal">
                        <TextBlock Margin="5,5,5,5" TargetUpdated="TextBlockExtensions_TargetUpdated">
         <TextBlock.Text>
          <MultiBinding StringFormat="Files with Extension  {0}">
           <Binding Path="FileExtension"/>
          </MultiBinding>
         </TextBlock.Text>
                        </TextBlock>
                        <Button x:Name="OpenFolderForThisFiles" Click="OnOpenFolderForThisFiles_Click" Margin="5, 3, 5, 3" Width="22" Background="Transparent" BorderBrush="Transparent" BorderThickness="0.5">
                            <Image Source="images\Folder.png" Height="16" Width="20" >
                            </Image>
                        </Button>
                    </StackPanel>
                </HierarchicalDataTemplate>
                <HierarchicalDataTemplate DataType="{x:Type lightvedo:FilePathsStore}">
                    <TextBlock Text="{Binding FilePaths, Mode=OneWay, NotifyOnTargetUpdated=True}" TargetUpdated="OnTreeViewNodeChildren_Update" />
                </HierarchicalDataTemplate>
            </TreeView.Resources>
            <TreeView.RenderTransform>
                <TransformGroup>
                    <ScaleTransform/>
                    <SkewTransform AngleX="-0.083"/>
                    <RotateTransform/>
                    <TranslateTransform X="-0.249"/>
                </TransformGroup>
            </TreeView.RenderTransform>
            <TreeView.BorderBrush>
                <LinearGradientBrush EndPoint="1,0.5" StartPoint="0,0.5">
                    <GradientStop Color="#FF74591F" Offset="0" />
                    <GradientStop Color="#FF9F7721" Offset="1" />
                    <GradientStop Color="#FFD9B972" Offset="0.49" />
                </LinearGradientBrush>
            </TreeView.BorderBrush>
        </TreeView>

问：为什么从 INotifyPropertyChange 派生的类中的数据不影响树项的显示。我是否理解：该界面将使 INotifyPropertyChange 自动重绘 TreeViewItems 还是需要手动执行此操作？目前 TreeViewItems 未更新，PropertyChamged 始终为 null。感觉OnPropertyChanged事件没有订阅者。

您不需要设置NotifyOnTargetUpdated.

相反，请确保提高PropertyChanged http://msdn.microsoft.com/en-us/library/system.componentmodel.inotifypropertychanged.propertychanged.aspx事件（带有通过PropertyChangedEventArgs http://msdn.microsoft.com/en-us/library/system.componentmodel.propertychangedeventargs.propertychangedeventargs.aspx每次更新路径集合时在父实体上传递给处理程序），或者将导航属性作为以下实现INotifyCollectionChanged http://msdn.microsoft.com/en-us/library/system.collections.specialized.inotifycollectionchanged.aspx.