Question

I am writing a windows phone 7 app and i have an xml file which looks like this

    <Barcodes>
  <Barcode code="7393997155338"
           companyName="Garbo Food AB"
           productName="Toast Loaf"/>

</Barcodes>

I am searching the xml file using xElement like below, i am getting not null on the listbox which says to me its populated?!?

        var searchElement = XElement.Load("storedBarcodes.xml");
        var barcodeProductResult = from var in searchElement.Descendants("Barcodes") 
                                   where var.Attribute("code").Value == b
                                   select new ProductBarcodes()
                                   {
                                       code = var.Attribute("code").Value,
                                       companyName = var.Attribute("companyName").Value,
                                       productName = var.Attribute("productName").Value

                                   };
        if (barcodeProductResult != null)
        {
            tbSuccessfullSearchOrNot.Text = ("Search has found a matching product!");

            if (resultsListBox != null)
            {

                resultsListBox.ItemsSource = barcodeProductResult;
                tbSuccessfullSearchOrNot.Text = ("Search has found a matching product! but listbox is not empty");
            }
            else
            {

                tbSuccessfullSearchOrNot.Text = ("Search has found a matching product! but listbox is empty");
            }
                //tbProductBarcode.Text = ("Product Barcode : " + _code + Environment.NewLine);
            //tbCompanyName.Text = ("Company Name: " + _companyName + Environment.NewLine);
        }
        else
        {
            tbSuccessfullSearchOrNot.Text = ("No matching product found!");
        }

and after the listbox is populated it should be output on the screen like below, I am trying a couple of ways ie. using {Binding Path=Element[code].Value}”, and just Text=”{Binding code}, the result is empty on output screen,

    <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
    <StackPanel>
        <Button Height="150" Content="Press here to scan a barcode !!" Click="Button_Click" Foreground="#FF2FFF07" />
        <TextBlock Margin="30" FontSize="36" TextWrapping="Wrap"   x:Name="tbSuccessfullSearchOrNot"/>
        <TextBlock Margin="30" FontSize="36" TextWrapping="Wrap"   x:Name="tbScanResultBarCode"/>
        <ListBox x:Name="resultsListBox" TabIndex="8" ItemsSource="barcodeProductResult" >
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel Margin="10" >
                        <TextBlock x:Name="results" Text="{Binding code}"   FontSize="22" FontWeight="Bold" FontStyle="Italic" Foreground="Orange"  />
                        <TextBlock Text="{Binding Path=Element[code].Value}" Foreground="Black"/>
                        <TextBlock Text="{Binding companyName}" Foreground="Black"/>
                        <TextBlock Text="{Binding productName}" Foreground="Black"/>
                    </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
        <!--<TextBlock Height="346" FontSize="36" x:Name="tbProductDetails" TextWrapping="Wrap"  Width="450" >

        </TextBlock>-->
        <TextBox Height="71" Name="tbProductBarcode"  Width="460" IsEnabled="False" IsReadOnly="True" DataContext="{Binding ElementName=tbProductBarcode}" />
        <TextBox Height="71" Name="tbCompanyName"  Width="460" IsEnabled="False" IsReadOnly="True" />
        <TextBox Height="71" Name="tbProductName"  Width="460" IsEnabled="False" IsReadOnly="True" />
        <!--<Button Height="150" Content="Tap to scan a QR code" Click="Button_Click_1"/>
        <TextBlock Margin="30" FontSize="36" TextWrapping="Wrap" x:Name="tbScanResultQR"/>-->

    </StackPanel>
</Grid>

Post Edit:
This is the code im basing my search on. This works,

       private void menuBtn_Click(object sender, RoutedEventArgs e)
    {
        var element = XElement.Load("SearchFile.xml");
        var filteredData = from var in element.Descendants("chipper")
                           where var.Attribute("County").Value.ToLower()==tbSearch.Text.ToLower() 
                           select new Counties()
                           {
                               LName = var.Attribute("LName").Value,
                               PlAddress = var.Attribute("PlAddress").Value,
                               County= var.Attribute("County").Value,
                               PhoneNumber = var.Attribute("PhoneNumber").Value


                           };

        ChipperListBox.ItemsSource = filteredData;
    }

and the xaml:

  <StackPanel x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,90" Orientation="Horizontal">
    <ListBox x:Name="ChipperListBox" SelectionChanged="listBox_SelectionChanged">
        <ListBox.ItemTemplate>
            <DataTemplate>
                <StackPanel Margin="10" >
                    <TextBlock x:Name="chipName" Text="{Binding LName}"   FontSize="22" FontWeight="Bold" FontStyle="Italic" Foreground="Orange" Tap="chipName_Tap" />
                    <TextBlock Text="{Binding PlAddress}" Foreground="Black"/>
                    <TextBlock Text="{Binding County}" Foreground="Black"/>
                    <TextBlock Text="{Binding PhoneNumber}" Foreground="Black"/>
                </StackPanel>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>
</StackPanel>

EDIT: I un this app on a windows phone because the emulator has no camera.heres the info from call stack after changing the element name to “Barcode” i get a readerException which stops the barcode scanner almost instantly but when i stop debugging i run again outside visual studio just on the phone and the app runs but still no output to the listbox in the xaml

“A first chance exception of type ‘com.google.zxing.ReaderException’
occurred in Silverlight_ZXing_Core.dll

Additional information: ReaderException”

Silverlight_ZXing_Core.dll!com.google.zxing.oned.UPCEANReader.findGuardPattern(com.google.zxing.common.BitArray row, int rowOffset, bool whiteFirst, int[] pattern) + 0xf1 bytes    
    Silverlight_ZXing_Core.dll!com.google.zxing.oned.UPCEANReader.findStartGuardPattern(com.google.zxing.common.BitArray row) + 0x8 bytes   
    Silverlight_ZXing_Core.dll!com.google.zxing.oned.UPCEANReader.decodeRow(int rowNumber, com.google.zxing.common.BitArray row, System.Collections.Generic.Dictionary<object,object> hints)    
    Silverlight_ZXing_Core.dll!com.google.zxing.oned.OneDReader.doDecode(com.google.zxing.BinaryBitmap image, System.Collections.Generic.Dictionary<object,object> hints) + 0x113 bytes 
    Silverlight_ZXing_Core.dll!com.google.zxing.oned.OneDReader.decode(com.google.zxing.BinaryBitmap image, System.Collections.Generic.Dictionary<object,object> hints) 
    Silverlight_ZXing_Core.dll!com.google.zxing.oned.OneDReader.decode(com.google.zxing.BinaryBitmap image) + 0x3 bytes 
>   WP7.ScanBarCode.dll!WP7.ScanBarCode.BarCode.cam_AutoFocusCompleted(object sender, Microsoft.Devices.CameraOperationCompletedEventArgs e) Line 114 + 0x7 bytes   C#
    Microsoft.Phone.dll!Microsoft.Devices.Camera.SafeFireEvent<Microsoft.Devices.CameraOperationCompletedEventArgs>.AnonymousMethod__1f(object ignored) + 0x17 bytes    
    mscorlib.dll!System.Threading.ThreadPool.WorkItem.WaitCallback_Context(object state) + 0x18 bytes   
    mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state) + 0x63 bytes    
    mscorlib.dll!System.Threading.ThreadPool.WorkItem.doWork(object o) + 0x47 bytes 
    mscorlib.dll!System.Threading.Timer.ring() + 0x70 bytes 

Answer 1

Barcodes is your root element and you want a list of Barcode items, so use this as your from:

from barcode in searchElement.Descendants("Barcode")

As a side note, your null checks aren’t correct. barcodeProductResult will not be null, but it might have a Count() of 0. resultsListBox will also never be null.