c# - 在 TreeView 控件中移动的标题文本

Question

我正在玩 WPF TreeView 控件并遇到奇怪的问题。当我以编程方式添加 TreeView 项目时，所有项目都正常工作，但如果我通过绑定添加项目 - 我的项目在标题中有间隙：

此外，这个差距只是 TreeItem 行的一个“敏感”部分。我无法通过单击文本来选择项目，只有单击空白区域才能选择它。这是我的代码：

namespace WPFTreeViewExperience
{
    /// <summary>
    /// Data item interface
    /// </summary>
    public interface IMyTree
    {
        string Title { get; set; }
        List<IMyTree> Items { get; set; }
    }

    /// <summary>
    /// Hierarchical data model
    /// </summary>
    public class MyTreeLevel : IMyTree
    {
        public string Title { get; set; }

        public List<IMyTree> Items { get; set; }

        public MyTreeLevel(string Title, params MyTreeLevel[] Items)
        {
            this.Title = Title;

            this.Items = new List<IMyTree>();

            foreach (MyTreeLevel item in Items)
            {
                this.Items.Add(item);
            }
        }
    }

    /// <summary>
    /// Viewmodel
    /// </summary>
    public class MyTreeViewModel : INotifyPropertyChanged
    {

        private void NotifyChanges(string PropName)
        {
            if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(PropName));
        }
    }

    private List<MyTreeLevel> _Tree;

    public List<MyTreeLevel> MyTree
    {
        get
        {
            return _Tree;
        }

        set
        {
            _Tree = value;
            NotifyChanges("MyTree");
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    public MyTreeViewModel()
    {
        List<MyTreeLevel> simpleTree = new List<MyTreeLevel>();

            simpleTree.Add(new MyTreeLevel("1-0", new MyTreeLevel("1-1"),
                                          new MyTreeLevel("1-2",
                                                                new MyTreeLevel("1-2-1"),
                                                                new MyTreeLevel("1-2-2")
                                                                ),
                                          new MyTreeLevel("1-3")));

            simpleTree.Add(new MyTreeLevel("2-0", new MyTreeLevel("2-1"),
                                          new MyTreeLevel("2-2",
                                                                new MyTreeLevel("2-2-1"),
                                                                new MyTreeLevel("2-2-2"),
                                          new MyTreeLevel("2-3"))));

            MyTree = simpleTree;
        }
    }

    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
        public partial class MainWindow : Window
        {        
            public MainWindow()
            {
                InitializeComponent();

                TreeExample.DataContext = new MyTreeViewModel();
            }
        }
    }

和我的 XAML 代码：

<Window x:Class="WPFTreeViewExperience.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:WPFTreeViewExperience"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <TreeView Name="TreeExample" ItemsSource="{Binding MyTree}">
            <TreeView.ItemTemplate>
                <HierarchicalDataTemplate ItemsSource="{Binding Items}" DataType="{x:Type local:MyTreeLevel}">
                    <TreeViewItem Header="{Binding Title}"/>
                </HierarchicalDataTemplate>
            </TreeView.ItemTemplate>
        </TreeView>        
    </Grid>
</Window>

我的绑定有什么问题？

Answer 1

我认为 ItemTemplate 应该是这样的：

  <HierarchicalDataTemplate ItemsSource="{Binding Items}" DataType="{x:Type local:MyTreeLevel}">
        <Grid>
            <TextBlock Margin="0" Text="{Binding Path=Title}" />
        </Grid>
    </HierarchicalDataTemplate>