private static async Task ReadReferencedCategoriesAsync(XmlReaderWrapper reader, ReferencedCategoriesDocument referencedCategories, Uri baseUri, Uri link, string version, bool preserveElementExtensions, bool preserveAttributeExtensions, int maxExtensionSize)
{
referencedCategories.BaseUri = baseUri;
referencedCategories.Link = link;
if (reader.HasAttributes)
{
while (reader.MoveToNextAttribute())
{
if (reader.LocalName == "base" && reader.NamespaceURI == Atom10FeedFormatter.XmlNs)
{
referencedCategories.BaseUri = FeedUtils.CombineXmlBase(referencedCategories.BaseUri, await reader.GetValueAsync());
}
else if (reader.LocalName == "lang" && reader.NamespaceURI == Atom10FeedFormatter.XmlNs)
{
referencedCategories.Language = await reader.GetValueAsync();
}
else if (reader.LocalName == App10Constants.Href && reader.NamespaceURI == string.Empty)
{
continue;
}
else
{
string ns = reader.NamespaceURI;
string name = reader.LocalName;
if (FeedUtils.IsXmlns(name, ns) || FeedUtils.IsXmlSchemaType(name, ns))
{
continue;
}
string val = await reader.GetValueAsync();
if (!TryParseAttribute(name, ns, val, referencedCategories, version))
{
if (preserveAttributeExtensions)
{
referencedCategories.AttributeExtensions.Add(new XmlQualifiedName(reader.LocalName, reader.NamespaceURI), await reader.GetValueAsync());
}
}
}
}
}
reader.MoveToElement();
bool isEmptyElement = reader.IsEmptyElement;
await reader.ReadStartElementAsync();
if (!isEmptyElement)
{
XmlBuffer buffer = null;
XmlDictionaryWriter extWriter = null;
try
{
while (await reader.IsStartElementAsync())
{
if (!TryParseElement(reader, referencedCategories, version))
{
if (preserveElementExtensions)
{
var tuple = await SyndicationFeedFormatter.CreateBufferIfRequiredAndWriteNodeAsync(buffer, extWriter, reader, maxExtensionSize);
buffer = tuple.Item1;
extWriter = tuple.Item2;
}
}
}
LoadElementExtensions(buffer, extWriter, referencedCategories);
}
finally
{
if (extWriter != null)
{
extWriter.Close();
}
}
await reader.ReadEndElementAsync();
}
}
