Re: Linq, what am I doing wrong?

Sun, 04 Jan 2009 13:34:28 -0700

Posted a 'reply on the VB.NET forum.

Maybe you can use this approach instead:

        Dim strURLSearch As String
        strURLSearch = "http://isbndb.com/api/books.xml"
        strURLSearch = strURLSearch & "?access_key=XXXXXXX"
        strURLSearch = strURLSearch & "&index1=isbn&value1=" & Me.txtIsbn.Text

        Dim xResults As XDocument = XDocument.Load(strURLSearch)




        Dim books = From book In xResults.Descendants("BookData") _
        Select book

        For Each b In books
            Console.WriteLine("Found {0}", b.Element("Title").Value)
            .....
        Next

: Code:
:
: Dim strURLSearch As String
: strURLSearch = "http://isbndb.com/api/books.xml"
: strURLSearch = strURLSearch & "?access_key=XXXXXX"
: strURLSearch = strURLSearch & "&index1=isbn&value1=" &
: Me.txtISBN.Text
:
: Dim xResults As XDocument = XDocument.Load(strURLSearch)
:
:
:
:
: Dim books = From book In xResults.Descendants("BookData")
: Select ISBN = Me.txtISBN.Text, Title = book.Element("Title").Value,
: Author = book.Element("AuthorText").Value, Publisher =
: book.Element("PublisherText").Value
:
: For Each book In books
: Me.txtResults.Text = Me.txtResults.Text & book.ISBN &
: vbTab & book.Title & vbTab & book.Author & vbCrLf
:
: Next
:
: End code
:
: I'm getting a NullReferenceException on the for next loop. Note, I
: did check the XML that I'm receiving back:
:
: <ISBNdb server_time="2008-12-21T02:40:22Z">
: −
: <BookList total_results="1" page_size="10" page_number="1"
: shown_results="1">
: −
: <BookData book_id="a_is_for_alibi_a01" isbn="0553279912"
: isbn13="9780553279917">
: <Title>"A" is for alibi</Title>
: <TitleLong>"A" is for alibi: a Kinsey Millhone Mystery</TitleLong>
: <AuthorsText>by Sue Grafton</AuthorsText>
: <PublisherText publisher_id="bantam_books">New York : Bantam Books,
: 1987, c1982.</PublisherText>
: </BookData>
: </BookList>
: </ISBNdb>
:

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Re: Linq, what am I doing wrong?