我在Windows 8商店应用。在这个项目中。我需要将数据发送到另一个页面。该计划是,我在MainPage.xaml中有一个ItemGridView,点击新闻的图像,并且需要将该新闻的ARTICLE ID发送到下一页,并且必须创建一个带有该ID的文章。ItemGridView ItemClick在Windows应用商店应用
我用这个做了这个windows phone 8应用程序;
private void MainLongListSelectorSelectionChanged(object sender, SelectionChangedEventArgs e)
{
NavigationService.Navigate(
new Uri(
"/DetailsPage.xaml?selectedIndex=" +
((MyWebApi.Headline) MainLongListSelector.SelectedItem).ARTICLEID, UriKind.Relative));
}
在赢店的应用程序,我试试这个;
private void itemGridView_ItemClick(object sender, ItemClickEventArgs e)
{
this.Frame.Navigate(typeof (BasicPage1),
((MyWebApi.MainPageHeadline) itemGridView.SelectedItem).ARTICLEID);
}
而且我也试过这样;
private void itemGridView_ItemClick(object sender, ItemClickEventArgs e)
{
var articleid = ((MyWebApi.MainPageHeadline) itemGridView.SelectedItem).ARTICLEID;
this.Frame.Navigate(typeof (BasicPage1), articleid);
}
但我得到的
“对象引用不设置到对象的实例。”
在该行的末尾。
我无法得到这个ID的价值。还有其他建议吗?
谢谢。
UPDATE:
这是MainPage.xaml.cs中;
public sealed partial class MainPage : try012.Common.LayoutAwarePage
{
private string _json = "";
private MyWebApi.RootObject Headlines { get; set; }
public MainPage()
{
this.InitializeComponent();
}
protected override void LoadState(Object navigationParameter, Dictionary<String, Object> pageState)
{
}
protected override void OnNavigatedTo(NavigationEventArgs e)
{
const string urlt = "MyWebApiURL";
var hWebRequestt = (HttpWebRequest)WebRequest.Create(urlt);
hWebRequestt.Method = "GET";
hWebRequestt.BeginGetResponse(MainLongListSelectorLoadCompletedt, hWebRequestt);
}
private void MainLongListSelectorLoadCompletedt(IAsyncResult ar)
{
var request = (HttpWebRequest)ar.AsyncState;
var response = (HttpWebResponse)request.EndGetResponse(ar);
using (var streamReader = new StreamReader(response.GetResponseStream()))
{
_json = streamReader.ReadToEnd();
Headlines = JsonConvert.DeserializeObject<MyWebApi.RootObject>(_json);
}
if (Headlines.MainPageHeadline.Count > 0)
Dispatcher.RunAsync(CoreDispatcherPriority.Normal,() =>
{
itemGridView.ItemsSource = Headlines.MainPageHeadline.ToList();
});
}
private void itemGridView_ItemClick(object sender, ItemClickEventArgs e)
{
this.Frame.Navigate(typeof(BasicPage1),((MyWebApi.MainPageHeadline)e.ClickedItem).ARTICLEID);
}
}
而这是BasicPage1.xaml.cs;
public sealed partial class BasicPage1 : try012.Common.LayoutAwarePage
{
public BasicPage1()
{
this.InitializeComponent();
}
protected override void LoadState(Object navigationParameter, Dictionary<String, Object> pageState)
{
}
protected override void SaveState(Dictionary<String, Object> pageState)
{
}
}
感谢answer.I见下文在Visual Studio时,我下面调试,它得到的ID,但是,当我向前说它“值不能为空。 参数名称:键”并导航“frameState [_pageKey] = pageState;”是否是下一页cs代码的原因?你能帮我解答一下吗 –
@KuthayGümüş你可以分享这两个页面的代码吗?它的这种难以判断这样的 – Manvik
我编辑的问题,检查它。 –