c# - 获取 TreeView 中所选项目的 TreeViewItem

Question

我有一个绑定(bind)到具有父子关系的数据集的 TreeView。我将如何从 TreeView 中获取选定的 TreeViewItem？请帮我。我的代码如下。

xaml:-

<TreeView Name="tvPersonal"  Background="Transparent"  ItemsSource="{Binding RootNodes}" SelectedItemChanged="tvPersonal_SelectedItemChanged">    
 <TreeView.ItemTemplate>
   <HierarchicalDataTemplate ItemsSource="{Binding rsParentChild}">
     <TextBlock Text="{Binding Name}" />
   </HierarchicalDataTemplate>
 </TreeView.ItemTemplate>

 public MainWindow()   

        {    
            InitializeComponent();    
            DataSet ds = new BL.BLMenu().GetAllMenues(new BOModule { Name = Modules.Personnel });
            ds.Tables[0].TableName = "Menu";
            DataRelation relation = new DataRelation("rsParentChild",
                    ds.Tables["Menu"].Columns["MenuId"],
                    ds.Tables["Menu"].Columns["ParentId"]);
            relation.Nested = true;    
            ds.Relations.Add(relation);
            BOMenu mnu = new BOMenu();    
            BOMenu.RootNodes = ds.Tables["Menu"].DefaultView;
            BOMenu.RootNodes.RowFilter = "ParentId IS NULL";    

            this.DataContext = this;
            stbiDate.Content = DateTime.Now;

        }
        public DataView RootNodes    
        {
            get { return BOMenu.RootNodes; }
        }

BOMenu 类:-

 public class BOMenu
    {
        public string MenuId
        {
            get;
            set;
        }

        public string Name
        {
            get;
            set;
        }

        public string ParentId
        {
            get;
            set;
        }

        public int Priority
        {
            get;
            set;
        }

        public static DataView RootNodes
        {
            get;
            set;
        }

    }

Answer 1

虽然 biju 的答案适用于平面层次结构，但我不得不寻找 HierarchicalDataTemplates 的解决方案。这是对我有用的扩展方法:

public static TreeViewItem ContainerFromItemRecursive(this ItemContainerGenerator root, object item)
{
    var treeViewItem = root.ContainerFromItem(item) as TreeViewItem;
    if (treeViewItem != null)
        return treeViewItem;
    foreach (var subItem in root.Items)
    {
        treeViewItem = root.ContainerFromItem(subItem) as TreeViewItem;
        var search = treeViewItem?.ItemContainerGenerator.ContainerFromItemRecursive(item);
        if (search != null)
            return search;
    }
    return null;
}

你可以使用它

TreeViewItem tvi = treeView
                       .ItemContainerGenerator
                       .ContainerFromItemRecursive(treeView.SelectedItem);