Windows Phone 几种页面间传递数据的方式

首先，我们要引用：using Microsoft.Phone.Shell;

第一种：

// 导航到新页面
NavigationService.Navigate(new Uri("/DetailsPage.xaml?selectedItem=" + MainListBox.SelectedIndex, UriKind.Relative));

DetailPage.xaml.cs

// 导航页面以将数据上下文设置为列表中的所选项时
protected override void OnNavigatedTo(NavigationEventArgs e)
{
   string selectedIndex = "";
   if (NavigationContext.QueryString.TryGetValue("selectedItem", out selectedIndex))
   {
      int index = int.Parse(selectedIndex);
      DataContext = App.ViewModel.Items[index];
   }
}

第二种：

第一个页面

PhoneApplicationService phoneAppService = PhoneApplicationService.Current;
protected override void OnNavigatedFrom(System.Windows.Navigation.NavigationEventArgs e)
{
    phoneAppService.State["myValue"] = textBox1.Text;
    base.OnNavigatedFrom(e);
}

传递到第二个页面

PhoneApplicationService phoneAppService = PhoneApplicationService.Current;
protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
{
    object someObject;
    if (phoneAppService.State.ContainsKey("myValue"))
    {
         if (phoneAppService.State.TryGetValue("myValue", out someObject))
         {
             textBox1.Text = someObject.ToString();
          }
     }
     base.OnNavigatedTo(e);
}