probleme requete linq xmlsource datgrideRésolu

Question

Bonjour, 


Je fais du vb dans un projet silverlight. Je suit un tutoriel du coach silverlight
(http://msdn.microsoft.com/fr-fr/silv.../cc512801.aspx) ecrit en c# mais je bloque sur ma requete , voici mon erreur :


Code :

Imports System.Xml.Linq

Partial Public Class MainPage
    Inherits UserControl

    Public Sub New()
        InitializeComponent()
    End Sub

    Private Sub search_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs)
        Dim topic As String
        Dim diggUrl As String
        Dim diggService As WebClient

        topic = research.Text

        diggUrl = String.Format("http://services.digg.com/stories/topic/{0}?count=20&appkey=http%3A%2F%2Fscottgu.com", topic)

        diggService = New WebClient()
        '  Specify that the DiggService_DownloadStoriesCompleted method gets called
        '  when the download completes.
        AddHandler diggService.DownloadStringCompleted, AddressOf DiggService_DownloadStoriesCompleted
        diggService.DownloadStringAsync(New Uri(diggUrl))

    End Sub


    Private Sub DiggService_DownloadStoriesCompleted(ByVal sender As System.Object, ByVal e As DownloadStringCompletedEventArgs)

        Dim result As String

        If (e.Error Is Nothing) Then
            'result = e.Result
            DisplayStories(e.Result)

            'id.Text = result
        Else
            ' id.Text = "error"
        End If

    End Sub

    Private Sub DisplayStories(ByVal xmlContent As String)

        Dim document As XDocument = XDocument.Parse(xmlContent)
        Dim res = From story In document.Descendants("story") _
                                                Select New Diggstory() With { _
                                               .Id = (story.Attribute("id")), _
                                               .Title = Convert.ToString(story.Element("title")), _
                                               .Description = Convert.ToString(story.Element("description")).Trim(), _
                                               .ThumbNail = (story.Element("thumbnail").Attribute("sr").Value)} _
        '.HrefLink = (New Uri(story.Attribute("link").ToString)), _
        ' .NumDiggs = Val(story.Attribute("diggs")), _
        ' .UserName = story.Element("user").Attribute("name").Value.ToString _



        id.Text = res.ToString
        StoriesList.ItemsSource = res



    End Sub

End Class

voici mon erreur: 

"La référence d'objet n'est pas définie à une instance d'un objet."

elle provient de StoriesList.ItemsSource = res

G4uthier · Accepted Answer

il n'aime pas les xattribute dans ma requete

Probleme requete linq xmlsource datgride

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