在AvaloniaUI/ReactiveUI应用程序的DataGrid内绑定ComboBox DataTemplate

<DataGrid x:Name="MyDataGrid" ItemsSource="{Binding MyDataCollection}">
    <!-- 其他列的定义 -->
    <DataGridTemplateColumn Header="ComboBox Column">
        <DataGridTemplateColumn.CellTemplate>
            <DataTemplate>
                <ComboBox ItemsSource="{Binding DataContext.ComboBoxItemsSource, RelativeSource={RelativeSource AncestorType=DataGrid}}">
                    <ComboBox.ItemTemplate>
                        <DataTemplate>
                            <!-- 定义ComboBox中每个选项的显示方式 -->
                            <TextBlock Text="{Binding}" />
                        </DataTemplate>
                    </ComboBox.ItemTemplate>
                </ComboBox>
            </DataTemplate>
        </DataGridTemplateColumn.CellTemplate>
    </DataGridTemplateColumn>
</DataGrid>

public class MyViewModel : ReactiveObject
{
    private ObservableCollection<string> comboBoxItemsSource;

    public ObservableCollection<string> ComboBoxItemsSource
    {
        get => comboBoxItemsSource;
        set => this.RaiseAndSetIfChanged(ref comboBoxItemsSource, value);
    }

    public MyViewModel()
    {
        ComboBoxItemsSource = new ObservableCollection<string>
        {
            "Option 1",
            "Option 2",
            "Option 3"
        };
    }
}

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        DataContext = new MyViewModel();
    }
}