public override async Task ReadFromAsync(XmlReader reader)
{
if (reader == null)
{
throw new ArgumentNullException(nameof(reader));
}
XmlReaderWrapper wrappedReader = XmlReaderWrapper.CreateFromReader(reader);
await wrappedReader.MoveToContentAsync();
if (!await CanReadAsync(reader))
{
throw new XmlException(string.Format(SR.UnknownDocumentXml, reader.LocalName, reader.NamespaceURI));
}
await ReadDocumentAsync(wrappedReader);
}
