windows phone 三种数据共享的方式(8)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;
// 引用命名空间--PhoneApplicationService类用到
using Microsoft.Phone.Shell;

namespace ShareData
{
     public  partial  class SecondPage : PhoneApplicationPage
    {
         public SecondPage()
        {
            InitializeComponent();
        }
         ///   <summary>
         ///  接受传递的值
         ///   </summary>
         ///   <param name="e"></param>
         protected  override  void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
        {
             // 获得App类中的共享数据
            PageTitle.Text = (Application.Current  as App).shareData.ToString();
             if (PhoneApplicationService.Current.State.ContainsKey( " Share "))
            {    
                 // 获得phoneapplicationService对象中设置state属性
                PageTitle.Text +=  " \n " + PhoneApplicationService.Current.State[ " Share "].ToString();
            }
             base.OnNavigatedTo(e);
        }
         ///   <summary>
         ///  导航到第一个页面
         ///   </summary>
         ///   <param name="sender"></param>
         ///   <param name="e"></param>
         private  void btn_Click( object sender, RoutedEventArgs e)
        {
             this.NavigationService.GoBack(); ;
        }


         // protected override void OnNavigatedFrom(System.Windows.Navigation.NavigationEventArgs e)
         // {
         //     if (e.Content is SecondPage)
         //     {
         //         ((SecondPage)e.Content).PageTitle.Text = "传递数据成功！";
         //     }
         //     (Application.Current as App).shareData = "通过APP类的属性共享数据";

         //     PhoneApplicationService.Current.State["Share"] = "临时数据";

         //     base.OnNavigatedFrom(e);
         // }