Silverlight中服务通信方式的选择(WCF、Data Service、Ria Service)

  
  

   
   //
   
    Silverlight 代码 
   
   //
   
    使用 LINQ 创建擦汗寻
   
    var qry 
   
   =
   
    (from g 
   
   in
   
    ds.Games 
   
   where
   
    g.Price 
   
   <
   
    50m orderby g.Name SELEct g) 
   
   as
   
    DataserviceQuery
   
   <
   
   Game
   
   >
   
   ; 
   
   //
   
    执行查询
   
    qry.beginExecute(
   
   new
   
    AsyncCallBACk(r 
   
   =>
   
    { 　　games2.Itemssource 
   
   =
   
    qry.EndExecute(r).ToList(); 　　games2.DisplaymemberPath 
   
   =
   
    
   
   "
   
   Name
   
   "
   
   ; }),
   
   null
   
   );
  
  

  
  

   
   //
   
    Silverlight代码 
   
   //
   
    context 对象监视数据变化
   
    XBoxGamesContext ctx 
   
   =
   
    
   
   new
   
    XBoxGamesContext(); 
   
   //
   
    RIA 查询，基于接口
   
    var qry 
   
   =
   
    ctx.GetGamesByGenrequery(
   
   "
   
   Shooter
   
   "
   
   ); 
   
   //
   
    绑定数据
   
    tHelist.Itemssource 
   
   =
   
    ctx.Load
   
   <
   
   Game
   
   >
   
   (qry).ALLENtities;
  
  

  
  

   
   var riaQry 
   
   =
   
    ctx.GetGamesQuery() .Where(g 
   
   =>
   
    g.Price 
   
   <
   
    50m) .orderBy(g 
   
   =>
   
    g.Name); Loadoperation
   
   <
   
   Game
   
   >
   
    op 
   
   =
   
    ctx.Load
   
   <
   
   Game
   
   >
   
   (riaQry);