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POItemGridView ItemClick on Windows Store App
 

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  1. POItemGridView ItemClick on Windows Store App
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    <p>I'm on windows 8 store app. In this project. I need to send the data to another page. The plan is, I have a ItemGridView in MainPage.xaml, I click the image of the news, and I need to send the ARTICLE ID of that news to next page and must create a article with that ID.</p> <p>I did this windows phone 8 application with this;</p> <pre><code>private void MainLongListSelectorSelectionChanged(object sender, SelectionChangedEventArgs e) { NavigationService.Navigate( new Uri( "/DetailsPage.xaml?selectedIndex=" + ((MyWebApi.Headline) MainLongListSelector.SelectedItem).ARTICLEID, UriKind.Relative)); } </code></pre> <p>In win store app, I try this ;</p> <pre><code>private void itemGridView_ItemClick(object sender, ItemClickEventArgs e) { this.Frame.Navigate(typeof (BasicPage1), ((MyWebApi.MainPageHeadline) itemGridView.SelectedItem).ARTICLEID); } </code></pre> <p>And I also tried like this;</p> <pre><code>private void itemGridView_ItemClick(object sender, ItemClickEventArgs e) { var articleid = ((MyWebApi.MainPageHeadline) itemGridView.SelectedItem).ARTICLEID; this.Frame.Navigate(typeof (BasicPage1), articleid); } </code></pre> <p>But I get the </p> <blockquote> <p>"<em>Object reference not set to an instance of an object.</em>"</p> </blockquote> <p>at the end of the line.</p> <p>I could not get the value of ID with this. Is there any other suggestion any advice ?</p> <p>Thank you.</p> <p><strong>UPDATE :</strong> </p> <p>This is MainPage.xaml.cs;</p> <pre><code>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&lt;String, Object&gt; 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&lt;MyWebApi.RootObject&gt;(_json); } if (Headlines.MainPageHeadline.Count &gt; 0) Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =&gt; { itemGridView.ItemsSource = Headlines.MainPageHeadline.ToList(); }); } private void itemGridView_ItemClick(object sender, ItemClickEventArgs e) { this.Frame.Navigate(typeof(BasicPage1),((MyWebApi.MainPageHeadline)e.ClickedItem).ARTICLEID); } } </code></pre> <p>And this is BasicPage1.xaml.cs;</p> <pre><code>public sealed partial class BasicPage1 : try012.Common.LayoutAwarePage { public BasicPage1() { this.InitializeComponent(); } protected override void LoadState(Object navigationParameter, Dictionary&lt;String, Object&gt; pageState) { } protected override void SaveState(Dictionary&lt;String, Object&gt; pageState) { } } </code></pre>
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