OpenXml开发-向文档中插入文本

public partial class WordprocessingDoc
    {
        private PackageHelper package;
        public PackageHelper Package
        {
            get { return package; }
            set { package = value; }
        }
        public WordprocessingDoc()
        {
        //Properties.Resources.BaseWordDocument为已经添加到资源中的一个空洞docx文档，这里也       
            package = new PackageHelper(Properties.Resources.BaseWordDocument);
        }
        public WordprocessingDoc(string strTempFile)
        {
        //用一个已经存在的文件
            package = new PackageHelper( FileHelper.ReadFile(strTempFile));
        }
    #region Insert Text
        //插入文字
        public void WriteText(XmlWriter writer, string inputString, string styleName, bool newParagraph)
        {
            //如果需要另起一段，添加相关标记
            if(newParagraph) writer.WriteStartElement(Prefixes.WordprocessingML, "p", Namespaces.WordprocessingML);
            //设置当前段落的样式ID,为空则不处理
            if (styleName != "") ApplyParagraphStyle(writer, styleName);
            writer.WriteStartElement(Prefixes.WordprocessingML, "r",
                Namespaces.WordprocessingML);
            writer.WriteElementString(Prefixes.WordprocessingML, "t",
                Namespaces.WordprocessingML, inputString);
            writer.WriteEndElement();
            if(newParagraph) writer.WriteEndElement();
        }
        #endregion
    }

    使用上面的类
    public static void Run()
        {
            PackageHelper package;
            WordprocessingDoc xmlDoc = new WordprocessingDoc();
            package = xmlDoc.Package;           
            Uri documentUri =
                new Uri(@"/word/document.xml", UriKind.Relative);
            XmlDocument documentXml =
                package.GetWritablePart(documentUri);
            XPathNavigator documentNav = documentXml.CreateNavigator().SelectSingleNode("w:document/w:body/w:p", Namespaces.NamespaceManager);
            using (XmlWriter writer = documentNav.ReplaceRange(documentNav))
            {                             
               xmlDoc.WriteText(writer, "2008-2-20 -2008-2-26","MySubTitle");
         }
    }