using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Xml;
using System.Xml.Linq;
using DocumentFormat.OpenXml.Packaging;

class Program
{
    public static XDocument LoadXDocument(OpenXmlPart part)
    {
        XDocument xdoc;
        using (StreamReader streamReader = new StreamReader(part.GetStream()))
            xdoc = XDocument.Load(XmlReader.Create(streamReader));
        return xdoc;
    }

    static void Main(string[] args)
    {
        const string filename = "SampleDoc.docx";

        using (WordprocessingDocument wordDoc = WordprocessingDocument.Open(filename, true))
        {
            MainDocumentPart mainPart = wordDoc.MainDocumentPart;
            StyleDefinitionsPart styleDefinitionsPart = mainPart.StyleDefinitionsPart;
            CommentsPart commentsPart = mainPart.CommentsPart;
            XDocument xDoc = LoadXDocument(mainPart);
            XDocument styleDoc = LoadXDocument(styleDefinitionsPart);
            XDocument commentsDoc = LoadXDocument(commentsPart);
            Console.WriteLine("The main document part has {0} nodes.", xDoc.DescendantNodes().Count());
            Console.WriteLine("The style part has {0} nodes.", styleDoc.DescendantNodes().Count());
            Console.WriteLine("The comments part has {0} nodes.", commentsDoc.DescendantNodes().Count());
        }
    }
}