C# WPF MVVM -如何从ItemsControl/DataTemplate访问特定项目？

public class MainViewModel : INotifyPropertyChanged
{
    private ObservableCollection<Item> items;
    public ObservableCollection<Item> Items
    {
        get { return items; }
        set
        {
            items = value;
            OnPropertyChanged(nameof(Items));
        }
    }

    // 其他代码...

    public event PropertyChangedEventHandler PropertyChanged;
    protected virtual void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

public class Item
{
    public string Name { get; set; }
    public string Description { get; set; }
}

<ItemsControl ItemsSource="{Binding Items}">
    <ItemsControl.ItemTemplate>
        <DataTemplate>
            <StackPanel>
                <TextBlock Text="{Binding Name}" />
                <TextBlock Text="{Binding Description}" />
                <Button Content="Click" Command="{Binding DataContext.ClickCommand, RelativeSource={RelativeSource AncestorType=ItemsControl}}" CommandParameter="{Binding}" />
            </StackPanel>
        </DataTemplate>
    </ItemsControl.ItemTemplate>
</ItemsControl>