Windows Phone 7 Tip (6) -- 如何恢复离开页面时的list位置

不废话，上代码：）

 

代码

   
     

    
      
    
      private
    
       
    
      double
    
      ?
    
       scrollOffset;


    
      private
    
       
    
      void
    
       scrollViewerHome_SizeChanged(
    
      object
    
       sender, SizeChangedEventArgs e)
 {
 
    
      if
    
       (scrollOffset.HasValue)
 {
 scrollViewerHome.ScrollToVerticalOffset(scrollOffset.Value);
 scrollOffset 
    
      =
    
       
    
      null
    
      ; 
    
      //
    
       No need to set the scroll offset again
    
      

    
       } 
 }


    
      protected
    
       
    
      override
    
       
    
      void
    
       OnNavigatedFrom(NavigationEventArgs e)
 {
 State[
    
      "
    
      ScrollOffsetKey
    
      "
    
      ] 
    
      =
    
       scrollViewerHome.VerticalOffset;
 }

 
    
      protected
    
       
    
      override
    
       
    
      void
    
       OnNavigatedTo(NavigationEventArgs e)
 {
 
 
    
      if
    
       (State.ContainsKey(
    
      "
    
      ScrollOffsetKey
    
      "
    
      ))
 {
 scrollOffset 
    
      =
    
       (
    
      double
    
      )State[
    
      "
    
      ScrollOffsetKey
    
      "
    
      ];
 }
 }