How to: Create a Basic Atom Feed

How to: Create a Basic Atom Feed

Windows Communication Foundation (WCF) allows you to create a service that exposes a syndication feed. This topic discusses how to create a syndication service that exposes an Atom syndication feed.

To create a basic syndication service

1. Define a service contract using an interface marked with the WebGetAttribute attribute. Each operation that is exposed as a syndication feed should return a Atom10FeedFormatter object.
   
   C#

   
   

   [ServiceContract]
   public interface IBlog
   {
       [OperationContract]
       [WebGet]
       Atom10FeedFormatter GetBlog();
   }

   Note:
   All service operations that apply the WebGetAttribute are mapped to HTTP GET requests. To map your operation to a different HTTP method, use the WebInvokeAttribute instead. For more information, see How to: Create a Basic WCF REST Service.

2. Implement the service contract.
   
   C#

   
   

   public class BlogService : IBlog
   {
       public Atom10FeedFormatter GetBlog()
       {
           SyndicationFeed feed = new SyndicationFeed("My Blog Feed", "This is a test feed", new Uri("http://SomeURI"), "FeedOneID", new DateTimeOffset(DateTime.Now));
           feed.Authors.Add(new SyndicationPerson("someone@microsoft.com"));
           feed.Categories.Add(new SyndicationCategory("How To Sample Code"));
           feed.Description = new TextSyndicationContent("This is a sample that illistrates how to expose a feed using ATOM with WCF");
   
           SyndicationItem item1 = new SyndicationItem(
               "Item One",
               "This is the content for item one",
               new Uri("http://localhost/Content/One"),
               "ItemOneID",
               DateTime.Now);
   
           SyndicationItem item2 = new SyndicationItem(
               "Item Two",
               "This is the content for item two",
               new Uri("http://localhost/Content/Two"),
               "ItemTwoID",
               DateTime.Now);
   
           SyndicationItem item3 = new SyndicationItem(
               "Item Three",
               "This is the content for item three",
               new Uri("http://localhost/Content/three"),
               "ItemThreeID",
               DateTime.Now);
           List items = new List();
   
           items.Add(item1);
           items.Add(item2);
           items.Add(item3);
   
           feed.Items = items;
           return new Atom10FeedFormatter(feed);
       }
   }

3. Create a SyndicationFeed object and add an author, category, and description.
   
   C#

   
   

   SyndicationFeed feed = new SyndicationFeed("My Blog Feed", "This is a test feed", new Uri("http://SomeURI"), "FeedOneID", new DateTimeOffset(DateTime.Now));
   feed.Authors.Add(new SyndicationPerson("someone@microsoft.com"));
   feed.Categories.Add(new SyndicationCategory("How To Sample Code"));
   feed.Description = new TextSyndicationContent("This is a sample that illistrates how to expose a feed using ATOM with WCF");

4. Create several SyndicationItem objects.
   
   C#

   
   

   SyndicationItem item1 = new SyndicationItem(
       "Item One",
       "This is the content for item one",
       new Uri("http://localhost/Content/One"),
       "ItemOneID",
       DateTime.Now);
   
   SyndicationItem item2 = new SyndicationItem(
       "Item Two",
       "This is the content for item two",
       new Uri("http://localhost/Content/Two"),
       "ItemTwoID",
       DateTime.Now);
   
   SyndicationItem item3 = new SyndicationItem(
       "Item Three",
       "This is the content for item three",
       new Uri("http://localhost/Content/three"),
       "ItemThreeID",
       DateTime.Now);

5. Add the SyndicationItem objects to the feed.
   
   C#

   
   

   List items = new List();
   
   items.Add(item1);
   items.Add(item2);
   items.Add(item3);
   
   feed.Items = items;

6. Return the feed.
   
   C#

   
   

   return new Atom10FeedFormatter(feed);

To host the service

See full details: http://msdn.microsoft.com/en-us/library/bb412177.aspx