WPF MVVM:延迟呈现视图，直到DataContext设置

在我们的MVVM应用程序中，在视图中，DataContext最初为空，稍后再设置。视图第一次呈现时没有DataContext集，因此对于绑定使用默认值或FallbackValues。一旦设置了DataContext并更新了所有绑定，这将导致UI中的许多更改。UI有点"弹性"，我可以想象相当多的CPU周期被浪费了。是否有一种方法来推迟渲染视图，直到DataContext设置?

为ViewModel查找视图的代码:

<ContentControl
     DataContext="{Binding Viewodel}"
     Content="{Binding}"
     Template="{Binding Converter={converters:ViewModelToViewConverter}}"/>

ViewModelToViewConverter.cs:

  public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
  {
     ViewModel viewModel = value as ViewModel;
     if (viewModel == null)
     {
        return null;
     }
     string modelName = viewModel.ToString();
     string mappingId = viewModel.MappingId;
     if (!string.IsNullOrEmpty(mappingId))
     {
        modelName += "_" + mappingId;
     }
     ControlTemplate controlTemplate = new ControlTemplate();
     MappingEntry mappingEntry = ApplicationStore.SystemConfig.GetMappingEntryOnModelName(modelName); // lookup View definition for ViewModel
     Type type = mappingEntry != null ? mappingEntry.ViewType : null;
     if (type != null)
     {
        controlTemplate.VisualTree = new FrameworkElementFactory(type);
     }
     else
     {
        Logger.ErrorFormat("View not found: {0}", modelName);
     }
     return controlTemplate;
  }