private static void ReadPartOfPackage(ZipPackage package, string partName, Action<XmlReader> partsReader)
        {
            Uri partUri = new Uri(partName, UriKind.Relative);
            if (!package.PartExists(partUri))
            {
                return;
            }
            var part = (ZipPackagePart)package.GetPart(partUri);
            var stream = part.GetStream();
            if (stream.Length == 0)
            {
                return;

            }

            using (var reader = new XmlTextReader(stream))
            {
                partsReader(reader);
            }
        }