為什么以下WPF樹視圖不起作用？

Question

自從我使用WPF以來已經有很長時間了，現在，我需要在WPF上做一個小項目，我在制作一個簡單的數據綁定樹視圖時遇到了一個非常奇怪的問題。

到目前為止的主窗口：

public partial class MainWindow : Window, INotifyPropertyChanged
{
    public MainWindow()
    {
        InitializeComponent();

        populateTreeview();
    }

    private XMLDataNode tree;

 public XMLDataNode TreeRoot
 {
     get { return tree; }
     set 
     { 
          tree = value;
          NotifyPropertyChanged("TreeRoot");
     }
 }

    //Open the XML file, and start to populate the treeview
    private void populateTreeview()
    {
        {
            try
            {
                //Just a good practice -- change the cursor to a 
                //wait cursor while the nodes populate    
                this.Cursor = Cursors.Wait;
                string filePath = System.IO.Path.GetFullPath("TestXML.xml");
                TreeRoot = RXML.IOManager.GetXMLFromFile(filePath).Last();
            }
            catch (XmlException xExc)
            //Exception is thrown is there is an error in the Xml
            {
                MessageBox.Show(xExc.Message);
            }
            catch (Exception ex) //General exception
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                this.Cursor = Cursors.AppStarting; //Change the cursor back
            }
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    public void NotifyPropertyChanged(string propName)
    {
        if (PropertyChanged != null)
            PropertyChanged(this, new PropertyChangedEventArgs(propName));
    }
}

我正在使用的數據類將XML節點加載到自身中：

public class XMLDataNode
{
    public XmlNode node;
    public string Title;
    public List<XMLDataNode> Children;

    public XMLDataNode(XmlNode XMLNode)
    {
        this.node = XMLNode;
        this.Title = node.ToString();
        Children = new List<XMLDataNode>();
        foreach (XmlNode item in XMLNode.ChildNodes)
        {
            Children.Add(new XMLDataNode(item));
        }
    }

主窗口XAML：

<Window x:Class="RotemXMLEditor.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="800" Width="1000" x:Name="me">
<Grid>
    <Grid.RowDefinitions>
        <RowDefinition />
        <RowDefinition />
    </Grid.RowDefinitions>

    <TreeView Grid.Row="1" x:Name="treeView" Background="White" ItemsSource="{Binding ElementName=me, Path=TreeRoot}">
        <TreeView.ItemTemplate>
            <HierarchicalDataTemplate ItemsSource="{Binding Children}">
                <TextBlock Text="{Binding Title}"/>
            </HierarchicalDataTemplate>
        </TreeView.ItemTemplate>

    </TreeView>
</Grid>

當前輸出是一個空的樹視圖，其中沒有任何內容，即使databinded對象中已填充信息。

我意識到這可能是一個愚蠢的錯誤，但我似乎真的找不到錯誤，幫助？

Answer 1

您可以在實現IEnumerable的集合中打開此屬性嗎？

public XMLDataNode TreeRoot

例如：

public XMLDataNode[] TreeRoots

TreeView的ItemsSource期望實現IEnumerable的類型

這對我有用：

<TreeView Grid.Row="1" x:Name="treeView" Background="White" ItemsSource="{Binding ElementName=me, Path=TreeRoots}">
    <TreeView.ItemTemplate>
        <HierarchicalDataTemplate ItemsSource="{Binding Children}">
            <TextBlock Text="{Binding Title}"/>
        </HierarchicalDataTemplate>
    </TreeView.ItemTemplate>
</TreeView>

private XMLDataNode[] treeRoots;
public XMLDataNode[] TreeRoots
{
    get { return treeRoots; }
    set
    {
        treeRoots = value;
        NotifyPropertyChanged("TreeRoots");
    }
}

private void populateTreeview()
    {
        {
            try
            {
                //Just a good practice -- change the cursor to a 
                //wait cursor while the nodes populate    
                this.Cursor = Cursors.Wait;
                string filePath = System.IO.Path.GetFullPath("TestXML.xml");
                TreeRoot = RXML.IOManager.GetXMLFromFile(filePath).Last();
                TreeRoots = new[] { TreeRoot };
            }
            catch (XmlException xExc)

Answer 2

我找到了解決方案。

即使字段是公共字段，WPF數據綁定也只能與屬性一起使用（我忘記了），而字段卻不起作用，將所有數據綁定的字段更改為實際屬性可以解決此問題。