Novacode.DocX.AddHyperlinkStyleIfNotPresent C# (CSharp) Method

        internal void AddHyperlinkStyleIfNotPresent()
        {
            Uri word_styles_Uri = new Uri("/word/styles.xml", UriKind.Relative);

            // If the internal document contains no /word/styles.xml create one.
            if (!package.PartExists(word_styles_Uri))
                HelperFunctions.AddDefaultStylesXml(package);

            // Load the styles.xml into memory.
            XDocument word_styles;
            using (TextReader tr = new StreamReader(package.GetPart(word_styles_Uri).GetStream()))
                word_styles = XDocument.Load(tr);

            bool hyperlinkStyleExists =
            (
                from s in word_styles.Element(w + "styles").Elements()
                let styleId = s.Attribute(XName.Get("styleId", w.NamespaceName))
                where (styleId != null && styleId.Value == "Hyperlink")
                select s
            ).Count() > 0;

            if (!hyperlinkStyleExists)
            {
                XElement style = new XElement
                (
                    w + "style",
                    new XAttribute(w + "type", "character"),
                    new XAttribute(w + "styleId", "Hyperlink"),
                        new XElement(w + "name", new XAttribute(w + "val", "Hyperlink")),
                        new XElement(w + "basedOn", new XAttribute(w + "val", "DefaultParagraphFont")),
                        new XElement(w + "uiPriority", new XAttribute(w + "val", "99")),
                        new XElement(w + "unhideWhenUsed"),
                        new XElement(w + "rsid", new XAttribute(w + "val", "0005416C")),
                        new XElement
                        (
                            w + "rPr",
                            new XElement(w + "color", new XAttribute(w + "val", "0000FF"), new XAttribute(w + "themeColor", "hyperlink")),
                            new XElement
                            (
                                w + "u",
                                new XAttribute(w + "val", "single")
                            )
                        )
                );
                word_styles.Element(w + "styles").Add(style);

                // Save the styles document.
                using (TextWriter tw = new StreamWriter(new PackagePartStream(package.GetPart(word_styles_Uri).GetStream())))
                    word_styles.Save(tw);
            }
        }