WPF - 将组合框绑定到自定义类对象列表

Question

我有一个带有组合框的 WPF 项目，我试图将其绑定到 ComboboxItem 对象列表。 ComboboxItem 是我为示例项目创建的一个类。这部分工作......我的三个项目可用于组合框，但显示的值为空白，combobox.SelectedValue 的值为空。我看过几篇关于如何做到这一点的 stackoverflow 文章和其他博客文章。据我所知，我做对了。但显然我做错了什么。这是一个测试项目的源代码...

XAML：

<Window x:Class="WpfTestApp_ComboBoxes.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525"
        Loaded="Window_Loaded">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="40"></RowDefinition>
            <RowDefinition Height="*"></RowDefinition>
        </Grid.RowDefinitions>
        <ComboBox x:Name="cboMyCombo" Grid.Row="0" 
                  SelectionChanged="cboMyCombo_SelectionChanged"></ComboBox>
    </Grid>
</Window>

C# 代码隐藏：

public partial class MainWindow : Window
{
    List<ComboboxItem> _list = new List<ComboboxItem>();

    public MainWindow()
    {
        _list.Add(new ComboboxItem() { DisplayValue = "One", InternalValue = "1" });
        _list.Add(new ComboboxItem() { DisplayValue = "Two", InternalValue = "2" });
        _list.Add(new ComboboxItem() { DisplayValue = "Three", InternalValue = "3" });

        InitializeComponent();
    }

    private void cboMyCombo_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        if (e.AddedItems.Count > 0)
        {
            ComboBox cb = sender as ComboBox;
            MessageBox.Show(string.Format("Selected Item: {0}, Selected Value: {1}", cb.SelectedItem, cb.SelectedValue));
        }
    }

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        cboMyCombo.ItemsSource = _list;
        cboMyCombo.DisplayMemberPath = "DisplayValue";
        cboMyCombo.SelectedValuePath = "InternalValue";
    }
}

ComboboxItem 类：

public class ComboboxItem
{
    public string DisplayValue;
    public string InternalValue;
}

Answer 1

改变

public class ComboboxItem
{
    public string DisplayValue;
    public string InternalValue;
}

到

public class ComboboxItem
{
    public string DisplayValue {get;set;}
    public string InternalValue {get;set;}
}