private static async Task<EpubNavigationLabel> ReadNavigationLabelAsync(XmlReader reader)
{
EpubNavigationLabel result = new EpubNavigationLabel();
var navigationLabelText = string.Empty;
//We have to read to <text> subnode of the navLabel node
do
{
if ((reader.LocalName.ToLowerInvariant() == "text") && (reader.NodeType == XmlNodeType.Element))
{
navigationLabelText = reader.ReadElementContentAsString();
}
} while (await reader.ReadAsync() && !(reader.NodeType == XmlNodeType.EndElement && reader.LocalName.ToLowerInvariant() == "navlabel"));
if (string.IsNullOrEmpty(navigationLabelText))
throw new Exception("Incorrect EPUB navigation label: label text element is missing");
result.Text = navigationLabelText;
return result;
}
private static EpubNavigationLabel ReadNavigationLabel(XmlNode navigationLabelNode)
{
EpubNavigationLabel result = new EpubNavigationLabel();
XmlNode navigationLabelTextNode = navigationLabelNode.ChildNodes.OfType<XmlNode>().
Where(node => String.Compare(node.LocalName, "text", StringComparison.OrdinalIgnoreCase) == 0).FirstOrDefault();
if (navigationLabelTextNode == null)
throw new Exception("Incorrect EPUB navigation label: label text element is missing");
result.Text = navigationLabelTextNode.InnerText;
return result;
}