Databases
StackOverflow2013
Postsdbo
POXML Parsing Error in Window Phone
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POXML Parsing Error in Window Phone
    primarykey
    data
    text
    <p>I'm creating a tweeter example in window phone and got <code>NullReferenceException</code></p> <p>I think it might be that the syntax is incorrect on the right side of the expression but couldn't tell what and why..</p> <p>Anyone has an idea why this resulted in error?</p> <p><strong>.xaml.cs:</strong></p> <pre><code>public partial class MainPage : PhoneApplicationPage { // Constructor public MainPage() { string url = "http://api.twitter.com/1/statuses/user_timeline.xml?screen_name=noradio"; WebClient twitter = new WebClient(); twitter.DownloadStringCompleted += new DownloadStringCompletedEventHandler(twitter_DownloadStringCompleted); twitter.DownloadStringAsync(new Uri(url)); } void twitter_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e) { if (e.Error != null) return; XElement xmlTweets = XElement.Parse(e.Result); listBox1.ItemsSource = from tweet in xmlTweets.Descendants("Status") select new TweeterItem { ImageSource = tweet.Element("user").Element("profile_image_url").Value, Message = tweet.Element("text").Value, UserName = tweet.Element("user").Element("screen_name").Value, }; } </code></pre> <p><strong>.xaml:</strong></p> <pre><code>&lt;ListBox Height="521" HorizontalAlignment="Left" Margin="0,131,0,0" Name="listBox1" VerticalAlignment="Top" Width="476"&gt; &lt;ListBox.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;StackPanel Orientation="Horizontal" Height="132"&gt; &lt;Image Source="{Binding ImageSource}" Height="73" Width="73" VerticalAlignment="Top" Margin="0,10,8,0"/&gt; &lt;StackPanel Width="370"&gt; &lt;TextBlock Text="{Binding UserName}" Foreground="#FFC8AB14" FontSize="28" /&gt; &lt;TextBlock Text="{Binding Message}" TextWrapping="Wrap" FontSize="24" /&gt; &lt;/StackPanel&gt; &lt;/StackPanel&gt; &lt;/DataTemplate&gt; &lt;/ListBox.ItemTemplate&gt; &lt;/ListBox&gt; </code></pre>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USPhilMY
    1. USJoeLA
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POXML Parsing Error in Window Phone
      1. USMorti
      1. VTFavorite
    2. VO
      singulars
      1. POXML Parsing Error in Window Phone
      1. This table or related slice is empty.
      1. VTApproveEditSuggestion
    1. COCan you include the stack trace where the exception occurs in your post? My gamble is that somewhere in your dotted chains of properties there is a null object.
      singulars
      1. POXML Parsing Error in Window Phone
      1. USGert Arnold
    2. COYou're right and here is the exception detail: System.NullReferenceException was unhandled Message=NullReferenceException StackTrace: at XmlApp.MainPage.twitter_DownloadStringCompleted(Object sender, DownloadStringCompletedEventArgs e) at System.Net.WebClient.OnDownloadStringCompleted(DownloadStringCompletedEventArgs e) at System.Net.WebClient.DownloadStringOperationCompleted(Object arg) at
      singulars
      1. POXML Parsing Error in Window Phone
      1. USJoeLA
    3. COI got this more descriptive error message. You think some references are missing? data.System.Collections.Generic.IEnumerator<TResult>.Current 'System.Collections.Generic.IEnumerable<XmlApp.TweeterItem>' does not contain a definition for 'System' and no extension method 'System' accepting a first argument of type 'System.Collections.Generic.IEnumerable<XmlApp.TweeterItem>' could be found (are you missing a using directive or an assembly reference?)
      singulars
      1. POXML Parsing Error in Window Phone
      1. USJoeLA
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload