DataBinding是一个二度子类(DataBinding a 2nd degree subclass)

 我需要帮助绑定数据，特别是如果根数据源对象有许多子类，并且那些子类也有子类。 这是我的DataModel： 
 
public class NowShowingMovies
{
  public ObservableCollection<Movie> MovieCollection { get; set; }
  public string Status { get; set; }
  public string Total{ get; set; }
}
public class Movie
{
  public string Id {get;set;}
  public string Title {get;set}
  public UserRating Rating {get;set;}
}
public class UserRating
{
  public string UserRatingURL {get;set;}
}
 
 我的XAML代码是： 
 
<GridView ItemsSource="{Binding MovieCollection}"
<GridView.ItemTemplate>
     <DataTemplate>
        <Grid>
            <Border Background="White">
                   <TexBlock Text="{Binding Title}"/>
            </Border>
             <Grid Background="Black" Margin="0,0,0,0" Opacity="0.75" x:Name="grid_rating"/>
                                <Image Source ="{Binding Path=MovieCollection.Rating.UserRatingURL}" />
             </Grid>
     </DataTemplate>
 </GridView.ItemTemplate>
 </GridView>
 
 问题是我无法使其发挥作用。 UserRatingURL未显示。 我甚至改成了 
 
<Image Source ="{Binding Path=MovieCollection[0].Rating.UserRatingURL}" />
 
 而且，没有运气。 我究竟做错了什么？ 提前致谢！ 

I need help in binding data especially if the root datasource object has many subclasses and those subclasses has a subclass too. Here is my DataModel:
 
public class NowShowingMovies
{
  public ObservableCollection<Movie> MovieCollection { get; set; }
  public string Status { get; set; }
  public string Total{ get; set; }
}
public class Movie
{
  public string Id {get;set;}
  public string Title {get;set}
  public UserRating Rating {get;set;}
}
public class UserRating
{
  public string UserRatingURL {get;set;}
}
 
And my XAML code is:
 
<GridView ItemsSource="{Binding MovieCollection}"
<GridView.ItemTemplate>
     <DataTemplate>
        <Grid>
            <Border Background="White">
                   <TexBlock Text="{Binding Title}"/>
            </Border>
             <Grid Background="Black" Margin="0,0,0,0" Opacity="0.75" x:Name="grid_rating"/>
                                <Image Source ="{Binding Path=MovieCollection.Rating.UserRatingURL}" />
             </Grid>
     </DataTemplate>
 </GridView.ItemTemplate>
 </GridView>
 
Problem is I can't make it work. UserRatingURL is not showing. I even changed it to 
 
<Image Source ="{Binding Path=MovieCollection[0].Rating.UserRatingURL}" />
 
and still, no luck. What am I doing wrong? Thanks in advance!

原文：https://stackoverflow.com/questions/19238399