Building a Web Message Board using Visual Studio 2008 Part II - Posting messages using Microsoft Word

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;
using System.ServiceModel.Syndication;
using MessageBoard.Web.Properties;
using System.Web;
using System.Globalization;

namespace MessageBoard.Web
{
    // NOTE: If you change the class name "FeedService" here, you must also update the reference to "FeedService" in App.config.
    public class FeedService : IFeedService
    {
        #region IFeedService Members

        public SyndicationFeedFormatter GetLatestMessages(FeedFormat format)
        {
            Uri rootUri = GetRootUri();
            SyndicationFeed feed = new SyndicationFeed(Resources.MessageBoard, Resources.MessageBoardDescription, rootUri);
            feed.Items = from m in MessageSource.GetRecentMessages(0, 10)
                         select CreateSyndicationItem(m, rootUri);
            
            if(format == FeedFormat.Atom)
                return new Atom10FeedFormatter(feed);
            
            return new Rss20FeedFormatter(feed);
        }

        #endregion

        private SyndicationItem CreateSyndicationItem(Message m, Uri rootUri)
        {
            UriBuilder uriBuilder = new UriBuilder(rootUri);
            uriBuilder.Path += "Message.aspx";
            uriBuilder.Query = "id=" + m.Id.ToString(CultureInfo.InvariantCulture);

            var item = new SyndicationItem(m.Subject, m.Text, uriBuilder.Uri, m.Id.ToString(), new DateTimeOffset(m.DatePosted, new TimeSpan(0)));
          
            item.Authors.Add(new SyndicationPerson(m.PostedBy));

            return item;
        }

        private Uri GetRootUri()
        {
            Uri uri = OperationContext.Current.Channel.LocalAddress.Uri;
            UriBuilder builder = new UriBuilder(uri);
            
            StringBuilder pathBuilder = new StringBuilder(builder.Path);
            int indexOfSlash = builder.Path.LastIndexOf('/');
            pathBuilder.Remove(indexOfSlash, builder.Path.Length - indexOfSlash);
            builder.Path = pathBuilder.ToString();

            return builder.Uri;
        }
    }
}