System.Xml.ni.dll中出现“System.Xml.XmlException”类型的异常

Question

实际上我已经做了一些带有xml解析的windows phone 8应用程序，比如解析新闻rss feed并且工作正常。但是我的最新项目有问题。，

我有一个政治新闻rss feed（http://ibnlive.in.com//ibnrss//rss//india//india.xml）并尝试解析它并将其显示在列表中。

但是我无法解析它。我希望我的代码是正确的

这是我的代码c＃

namespace indianPolitics
{
public partial class news1 : PhoneApplicationPage
{
    ProgressIndicator _progressIndicator = new ProgressIndicator();
    public news1()
    {
        InitializeComponent();
        Loaded += news1_Loaded;
    }
    void news1_Loaded(object sender, RoutedEventArgs e)
    {
        WebClient _client = new WebClient();
        _client.DownloadStringCompleted += _client_DownloadStringCompleted;
        _client.DownloadStringAsync(new Uri("http://ibnlive.in.com//ibnrss//rss//india//india.xml", UriKind.Absolute));

        SystemTray.ProgressIndicator = _progressIndicator;
        _progressIndicator.IsIndeterminate = true;
        _progressIndicator.IsVisible = true;
    }
    private void _client_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
    {
        if (e.Error != null)
        {
            Deployment.Current.Dispatcher.BeginInvoke(() =>
            {
               MessageBox.Show("Error Message"+e.Error.Message);
            });
         }
        else
        {
            try
            {
                MessageBox.Show("Result Before Parse:"+e.Result);
                XDocument xmlDoc = XDocument.Parse(e.Result);
                var all = xmlDoc.Descendants("channel");
                List<News1> _singleRsses = new List<News1>();
                foreach (var item in all)
                {
                    var itemVedio = item.Descendants("item");
                    foreach (var xElement in itemVedio)
                    {
                        string _title = xElement.Element("title").Value;
                        string _description = xElement.Element("description").Value;
                        string pubDate = xElement.Element("pubDate").Value;
                        string link = xElement.Element("link").Value;

                        News1 _singleRss = new News1
                        {
                            Title = _title,
                            Description = _description,
                            PubDate = pubDate,
                            Link = link
                        };
                        _singleRsses.Add(_singleRss);
                    }
                }
                singleListbox.DataContext = _singleRsses;
            }
            catch (Exception exp)
            {
                MessageBox.Show("Exception: "+exp);
                _progressIndicator.IsIndeterminate = false;
                _progressIndicator.IsVisible = false;
            }
            finally
            {
                _progressIndicator.IsIndeterminate = false;
                _progressIndicator.IsVisible = false;
            }
        }
    }
    private void News1Grid_Tap(object sender, System.Windows.Input.GestureEventArgs e)
    {

    }
}
public class News1
{
    public string Title { get; set; }
    public string ImageSource { get; set; }
    public string Description { get; set; }
    public string PubDate { get; set; }
    public string Link { get; set; }
}

}

和我的XAML代码

     <Grid x:Name="ContentPanel" Grid.RowSpan="2">
        <Grid.Resources>
            <DataTemplate x:Key="NewsDateTemplate">
                <Grid Tag="{Binding Link}" x:Name="News1Grid" Tap="News1Grid_Tap"  Width="420" Visibility="Visible" Margin="0,0,0,10" >
                    <Grid.RowDefinitions>
                        <RowDefinition Height="Auto"/>
                        <RowDefinition Height="Auto"/>
                        <RowDefinition Height="Auto"/>
                        <RowDefinition Height="Auto"/>
                    </Grid.RowDefinitions>
                    <TextBlock Text="{Binding PubDate}" Foreground="LightGoldenrodYellow" FontSize="18"/>
                    <Border Background="#FFD69F0B" Grid.Row="1">
                        <TextBlock  Text="{Binding Title}" Foreground="Black" TextWrapping="NoWrap" FontSize="20" FontWeight="Bold"/>
                    </Border>
                    <Grid Width="420" HorizontalAlignment="Left" Grid.Row="2" Margin="0,0,0,10">
                       <TextBlock Foreground="Black" Text="{Binding Description}" TextWrapping="Wrap" TextTrimming="WordEllipsis"/>
                    </Grid>
                    <Rectangle Fill="Black" Height="1" Grid.Row="3" Opacity=".5"/>
                </Grid>
            </DataTemplate>
        </Grid.Resources>
        <Border VerticalAlignment="Top" Height="80" Background="LightGray">
            <TextBlock Name="ministerHeader" Text="Ministers" FontSize="40" TextTrimming="WordEllipsis" TextWrapping="Wrap" VerticalAlignment="Center" TextAlignment="Center" Foreground="Black" FontFamily="Times New Roman" ></TextBlock>
        </Border>
        <ListBox Name="singleListbox" Margin="0,85,0,0" ItemsSource="{Binding}" ItemTemplate="{StaticResource NewsDateTemplate}">

        </ListBox>
    </Grid>

注意：如果我像这样解析其他xml提要（http://www.skysports.com//rss//0,20514,11827,00.xml）意味着

它解析xml并在列表框中显示数据。

我还打印了

的结果

  private void _client_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e) 

带

的事件处理程序

    MessageBox.Show("Result Before Parse:"+e.Result);

，它显示“空”消息框。，

还有

     catch (Exception exp)
            {
                MessageBox.Show("Exception: "+exp);
             }

它显示如下错误：

        "Exception: Root Element Missing"

请有人给我正确的解决方案。我有几周时间都在努力解决这个问题。

提前感谢。