XmlLoading（Linq）

代码

   
     

    
      
    
      
 
    
      void
    
       Page_Loaded(
    
      object
    
       sender, RoutedEventArgs e)
 {
 WebClient client
    
      =
    
      new
    
       WebClient ();
 client .OpenReadCompleted
    
      +=
    
      new
    
       OpenReadCompletedEventHandler(client_OpenReadCompleted);
 client .OpenReadAsync(
    
      new
    
       Uri (
    
      "
    
      Data.xml
    
      "
    
       ,UriKind.Relative));
 }

 
    
      void
    
       client_OpenReadCompleted(
    
      object
    
       sender, OpenReadCompletedEventArgs e)
 {
 XElement xml
    
      =
    
      XElement .Load (XmlReader.Create (e.Result ));
 var query
    
      =
    
      
 from i 
    
      in
    
       xml.DescendantsAndSelf(
    
      "
    
      item
    
      "
    
      )
 let cid
    
      =
    
      (
    
      string
    
      )i.Ancestors (
    
      "
    
      customer
    
      "
    
      ).First().Attribute (
    
      "
    
      id
    
      "
    
      )
 group (
    
      decimal
    
      ) i.Attribute (
    
      "
    
      price
    
      "
    
      )
    
      *
    
      (
    
      int
    
      )i.Attribute (
    
      "
    
      quantity
    
      "
    
      )
 by cid
 into groupedSales
 let totalSales
    
      =
    
      groupedSales .Sum()
 orderby totalSales descending 
 select 
    
      new
    
       SalesData {
 Customer 
    
      =
    
      groupedSales.Key ,
 TotalSales 
    
      =
    
      totalSales 
 };
 LayoutRoot .DataContext 
    
      =
    
      query .ToList ();
 }