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;
 
public static class LocalExtensions
{
    public static string GetPath(this XElement el)
    {
        return
            el
            .AncestorsAndSelf()
            .Aggregate("", (seed, i) => i.Name.LocalName + "/" + seed);
    }
 
    public static string StringConcatenate(
        this IEnumerable<string> source)
    {
        return source.Aggregate(
            new StringBuilder(),
            (s, i) => s.Append(i),
            s => s.ToString());
    }
 
    public static string StringConcatenate<T>(
        this IEnumerable<T> source,
        Func<T, string> projectionFunc)
    {
        return source.Aggregate(
            new StringBuilder(),
            (s, i) => s.Append(projectionFunc(i)),
            s => s.ToString());
    }
}
 
class Program
{
    readonly static XNamespace w =
      "http://schemas.openxmlformats.org/wordprocessingml/2006/main";
 
    public static XDocument LoadXDocument(OpenXmlPart part)
    {
        XDocument xdoc;
        using (StreamReader streamReader = new StreamReader(part.GetStream()))
            xdoc = XDocument.Load(XmlReader.Create(streamReader));
        return xdoc;
    }
 
    public static string GetParagraphStyle(XElement para)
    {
        return (string)para.Elements(w + "pPr")
                           .Elements(w + "pStyle")
                           .Attributes(w + "val")
                           .FirstOrDefault();
    }
 
    static void Main(string[] args)
    {
        const string filename = "SampleDoc.docx";
 
        using (WordprocessingDocument wordDoc =
            WordprocessingDocument.Open(filename, true))
        {
            MainDocumentPart mainPart = wordDoc.MainDocumentPart;
            StyleDefinitionsPart stylePart = mainPart.StyleDefinitionsPart;
            XDocument mainPartDoc = LoadXDocument(mainPart);
            XDocument styleDoc = LoadXDocument(stylePart);
 
            string defaultStyle =
                (string)styleDoc.Root
                                .Elements(w + "style")
                                .Where(style =>
                                    (string)style.Attribute(w + "type") == "paragraph" &&
                                    (string)style.Attribute(w + "default") == "1")
                                .First()
                                .Attribute(w + "styleId");
 
            var paragraphs =
                mainPartDoc.Root
                           .Element(w + "body")
                           .Descendants(w + "p")
                .Select(p =>
                {
                    string style = GetParagraphStyle(p);
                    string styleName = style == null ? defaultStyle : style;
                    return new
                    {
                        ParagraphNode = p,
                        Style = styleName
                    };
                }
                );
 
            XName r = w + "r";
            XName ins = w + "ins";
 
            var paragraphsWithText =
                paragraphs.Select(p =>
                    new
                    {
                        ParagraphNode = p.ParagraphNode,
                        Style = p.Style,
                        Text = p.ParagraphNode
                                .Elements()
                                .Where(z => z.Name == r || z.Name == ins)
                                .Descendants(w + "t")
                                .StringConcatenate(s => (string)s)
                    }
                );
 
            foreach (var p in paragraphsWithText)
                Console.WriteLine("{0} {1}",
                    p.Style != null ?
                    p.Style.PadRight(12) :
                    "".PadRight(12),
                    p.Text);
        }
    }
}