C# 如何从树视图中获取SelectedItem？

我有一个WPF层次树视图，其中有一个文本块来显示我的列表。我想将选定的字符串值作为参数传递给我的ViewModel。我正在使用MVVM

这是树景：

 <TreeView ItemsSource="{Binding countryReportsHierarchy}">
                    <i:Interaction.Triggers>
                        <i:EventTrigger EventName="SelectedItemChanged">
                            <i:InvokeCommandAction Command="{Binding ArticleCategoryTitleSelectionChangedCommand}" />
                        </i:EventTrigger>
                    </i:Interaction.Triggers>
                    <TreeView.Resources>
                        <HierarchicalDataTemplate  DataType="{x:Type t:CountryReportsHierarchy}"
                                ItemsSource="{Binding ArticleCategoriesHierarchyCollection}">
                            <TextBlock Text="{Binding Name}" />
                        </HierarchicalDataTemplate>
                        <HierarchicalDataTemplate  DataType="{x:Type t:ArticleCategoriesHierarchy}"
                                ItemsSource="{Binding ArticleTypesHierarchyCollection}">
                            <TextBlock Text="{Binding Name}"/>
                        </HierarchicalDataTemplate>
                        <DataTemplate  DataType="{x:Type t:ArticleTypesHierarchy}">
                            <TextBlock Text="{Binding ElementName= Name, Path=SelectedItem, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" >
                            </TextBlock>
                        </DataTemplate>
                    </TreeView.Resources>
                </TreeView>

   public class CountryReportsHierarchy
{
    IIsesServiceChannel IsesService;
    public ObservableCollection<tbArticleCategory> ArticleCategoryList;

    public ObservableCollection<ArticleCategoriesHierarchy> ArticleCategoriesHierarchyCollection { get; set; }
    public string Name { get; set; }

    public CountryReportsHierarchy(IIsesServiceChannel isesService)
    {
        this.IsesService = isesService;          
        ArticleCategoryList = new ObservableCollection<tbArticleCategory>(IsesService.GetArticleCatagoryTitles());           

        ArticleCategoriesHierarchyCollection = new ObservableCollection<ArticleCategoriesHierarchy>();

        foreach (var a in ArticleCategoryList)
        {
            ArticleCategoriesHierarchyCollection.Add(new ArticleCategoriesHierarchy(IsesService, a.Category) { Name = a.CategoryTitle });
        }
    } 
}

public class ArticleCategoriesHierarchy
{
    IIsesServiceChannel IsesService;

    public ObservableCollection<tbArticleType> ArticleTypeList;
    public ObservableCollection<ArticleTypesHierarchy> ArticleTypesHierarchyCollection { get; set; }
    public string Name { get; set; }
    public ArticleCategoriesHierarchy(IIsesServiceChannel isesService, string articleCategoryType)
    {
        this.IsesService = isesService;

        ArticleTypeList = new ObservableCollection<tbArticleType>(IsesService.GetArticleCategoryTypes(articleCategoryType));

        ArticleTypesHierarchyCollection = new ObservableCollection<ArticleTypesHierarchy>();

        foreach (var a in ArticleTypeList)
        {
            ArticleTypesHierarchyCollection.Add(new ArticleTypesHierarchy() { Name = a.ArticleTitle });
        }
    }
}

public class ArticleTypesHierarchy
{
    public string Name { get; set; }
}

我试图从以下文本块中获取选定值的部分：

<TextBlock Text="{Binding Name}"/>                         

这将按预期绑定，显然没有选择值。有没有办法传递TextBlock的选定值？我尝试了以下操作，但绑定失败：

<TextBlock Text="{Binding ElementName= Name, Path=SelectedItem" />

---

以下是我解决这个问题的方法。我扩展了TreeView类以包括SelectedItem功能：

public class ExtendedTreeView : TreeView
{
    public ExtendedTreeView()
        : base()
    {
        this.SelectedItemChanged += new RoutedPropertyChangedEventHandler<object>(___ICH);
    }

    void ___ICH(object sender, RoutedPropertyChangedEventArgs<object> e)
    {
        if (SelectedItem != null)
        {
            SetValue(SelectedItem_Property, SelectedItem);
        }
    }

    public object SelectedItem_
    {
        get { return (object)GetValue(SelectedItem_Property); }
        set { SetValue(SelectedItem_Property, value); }
    }
    public static readonly DependencyProperty SelectedItem_Property = DependencyProperty.Register("SelectedItem_", typeof(object), typeof(ExtendedTreeView), new UIPropertyMetadata(null));
}

ViewModel传入

ArticleTypesHierarchy.Name

（我选择的TreeView字符串）参数：

    public ReportViewModel()
    {
        countryReportsHierarchy = new ObservableCollection<CountryReportsHierarchy>(new[]{
        new CountryReportsHierarchy(IsesService){Name = CountryReportTitle}});
    }


  private ArticleTypesHierarchy _SelectedArticleTitle;
    public ArticleTypesHierarchy SelectedArticleTitle
    {
        get { return _SelectedArticleTitle; }
        set
        {
            _SelectedArticleTitle = value;
            OnPropertyChanged("SelectedArticleTitle");
        }
    }      

    private void ArticleCategoryTitleSelectionChangedCommandAction()
    {
        GetData(SelectedArticleTitle.Name)
    }

公共报告视图模型（） { countryReportsHierarchy=新的ObservableCollection（新[]{ 新的CountryReportsHierarchy（ISessService）{Name=CountryReportTitle}}； } 私人物品类型电子档案(你选择的物品名称);； public Article TypesHierarchy Selected文章标题 { 获取{return\u selectedarticletTitle；} 设置 { _SelectedArticleTitle=值； OnPropertyChanged（“SelectedArticleTitle”）； } } 私有无效ArticleCategoryTitleSelectionChangedCommandAction（） { GetData（SelectedArticleTitle.Name） }

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听起来不对，给我们看更多的代码你想要整个TreeView代码吗？只有2个数据模板，你在这里显示的第一个模板在第一行是关闭的，它本身在textblock中没有SelectedItem，因为它不是项控件。好的，你需要一个行为，看看[here][1]中的示例。[1]:

    public ReportViewModel()
    {
        countryReportsHierarchy = new ObservableCollection<CountryReportsHierarchy>(new[]{
        new CountryReportsHierarchy(IsesService){Name = CountryReportTitle}});
    }


  private ArticleTypesHierarchy _SelectedArticleTitle;
    public ArticleTypesHierarchy SelectedArticleTitle
    {
        get { return _SelectedArticleTitle; }
        set
        {
            _SelectedArticleTitle = value;
            OnPropertyChanged("SelectedArticleTitle");
        }
    }      

    private void ArticleCategoryTitleSelectionChangedCommandAction()
    {
        GetData(SelectedArticleTitle.Name)
    }