WPFXaml页面中绑定失效问题

 public partial class Translation : UserControl
 {
     readonly TranslationViewModel viewModel;
     public Translation()
     {

         InitializeComponent();
         this.DataContext = viewModel = new TranslationViewModel();
         page.SetBinding(PagingControl.TotalCountProperty, new Binding("TotalCount") { Source = viewModel, Mode = BindingMode.OneWay });
         page.SetBinding(PagingControl.CommandProperty, new Binding("PagingQueryCommand") { Source = viewModel });
     }