WCF Syndication

Web syndication is a form of syndication in which website material is made available to multiple other sites.

E.g.   latest news or forum posts

·         Most common feed formats is called RSS  2.0 ( "Really Simple Syndication." ) , It is an XML format, considered highly stable, that allows for extensions only through the use of namespaces

·        Second  syndication feed is also called RSS "RDF Site Summary" and it's RSS 1.0

·        Third  common format for syndication feeds is called Atom .It was created using a wiki,

WCF provides support for exposing syndication feeds from a WCF service. 

 Namespace:  System.ServiceModel.Syndication

Interface

using System;

using System.Collections.Generic;

using System.Linq;

using System.Runtime.Serialization;

using System.ServiceModel;

using System.Text;

using System.ServiceModel.Syndication;

using System.ServiceModel.Web;

namespace WCF_Syndication_RSSFeed

{

    //ServiceKnownType: indicate that what is the return

    //type of our desired feed will be look like . eg:ATOM or RSS.

    [ServiceContract]

    [ServiceKnownType(typeof(Atom10FeedFormatter))]

    [ServiceKnownType(typeof(Rss20FeedFormatter))]

    public interface IService1

    {

         

       [WebGet(UriTemplate = "/feed/{format}")]

       [OperationContract]

        SyndicationFeedFormatter getinfo(string format);

    }

}

Service

<%@ ServiceHost

 Language="C#"

 Debug="true"

 Service="Feeds"

 CodeBehind="Feeds.svc.cs"

 Factory="System.ServiceModel.Activation.WebServiceHostFactory" %>

 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Runtime.Serialization;

using System.ServiceModel;

using System.Text;

using System.ServiceModel.Syndication;

using System.ServiceModel.Web;

using System.ServiceModel.Activation;

namespace WCF_Syndication_RSSFeed

{

   

    public class Service1 : IService1

    {

        public SyndicationFeedFormatter getinfo(string format)

        {

            SyndicationItem item1 = new SyndicationItem(

                             "Google News",

                             "see google news",

                             new Uri("https://news.google.com//"),

                             "GGL001",

                             DateTime.Now);

       

            SyndicationItem item2 = new SyndicationItem(

                           "Timesofindia News",

                           "Ser time of india news",

                           new Uri("http://timesofindia.indiatimes.com/"),

                           "TOI001",

                           DateTime.Now);

       

            SyndicationItem item3 = new SyndicationItem(

                "BBC News",

                "see bbc news information",

                new Uri("http://www.bbc.com"),

                "BBC001",

                DateTime.Now);

            //Adding the items to the list of generic syndication items.

            List<SyndicationItem> items = new List<SyndicationItem>();

            items.Add(item1);

            items.Add(item2);

            items.Add(item3);

            SyndicationFeed feed = new SyndicationFeed();

            feed.Title = new TextSyndicationContent("Website Feed");

            feed.Description = new TextSyndicationContent("News Providing Websites");

            feed.Authors.Add(new SyndicationPerson("Newsfeeder@gmail.com"));          

            feed.Categories.Add(new SyndicationCategory("News Websites"));        

         

         

            feed.Items = items;

            if (format == "rss")

                return new Rss20FeedFormatter(feed);

            else if (format == "atom")

                return new Atom10FeedFormatter(feed);

            else return null;           

        

        }

    }

}

Right click on service to view in browser

Client Side :

Client :

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Xml;

using System.ServiceModel.Syndication;

namespace WCF_Syndication_RSSFeed

{

    public partial class FeedReader : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

            XmlReader atomReader = XmlReader.Create("http://localhost:50443/Service1.svc/feed/atom");

            Response.Write("-----------Atom feed-------------</br>");

            SyndicationFeed atomFeed = SyndicationFeed.Load(atomReader);

            Response.Write("Title :" + atomFeed.Title.Text + "</br>");

            Response.Write("Description :" + atomFeed.Description.Text + "</br>");

            Response.Write("Authors :" + atomFeed.Authors[0].Email + "</br>");

            Response.Write("Categories :" + atomFeed.Categories[0].Name+ "</br>");

            Response.Write("-------Atom Items------</br>");

            foreach (SyndicationItem item in atomFeed.Items)

            {

                Response.Write("Title:<a target='_blank' href='"+ item.Links[0].Uri.ToString() +"'>" + item.Title.Text + "</a></br>");

                Response.Write("Content:" + ((TextSyndicationContent)item.Content).Text + "</br>");

            }

            Response.Write("</br></br>");

                   

            Response.Write("-----------RSS 2.0 format feed-------------</br>");    

            XmlReader rssReader = XmlReader.Create("http://localhost:50443/Service1.svc/feed/rss");

            SyndicationFeed rssFeed = SyndicationFeed.Load(rssReader);

            Response.Write("Title :" + rssFeed.Title.Text + "</br>");

            Response.Write("Description :" + rssFeed.Description.Text + "</br>");

            Response.Write("Authors :" + rssFeed.Authors[0].Email + "</br>");

            Response.Write("Categories :" + rssFeed.Categories[0].Name + "</br>");

            Response.Write("-------RSS Items------</br>");

            foreach (SyndicationItem item in rssFeed.Items)

            {

                Response.Write("Title:<a target='_blank' href='" + item.Links[0].Uri.ToString() + "'>" + item.Title.Text + "</a></br>");

                Response.Write("Content:" + ((TextSyndicationContent)item.Summary).Text + "</br>");

            }

        }

    }

}

  

Out Put: