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WCF Syndication RSS/Atom

1 Create a RESTful WCF Service 

  • Open Visual Studio
  • Select File > New > Project
  • Select WCF Service Library template under Visual C# > WCF templates
  • Change the name to ProductServiceLibrary and click OK
  • Visual studio will add reference to System.ServiceModel, System.Runtime.Serialization and will add some files with sample code. 
  • Delete IService1.cs and Service1.cs
  • Add reference to System.ServiceModel.Web
  • Add a new class called ProductService

1.1 Create the Data Contract 

  • Open ProductService.cs file that you created.
  • Add using System.Runtime.Serialization;
  • Add using System.ServiceModel;
  • Add using System.ServiceModel.Web;
  • Add using using System.ServiceModel.Syndication;
  • Add the following code in the ProductService.cs class
    [DataContract]
    public class ProductReview 
    {
        [DataMember]
        public string Id { get; set; }
        [DataMember]
        public string ProductCode { get; set; }
        [DataMember]
        public string ProductName { get; set; }
        [DataMember]
        public string Review {get; set; }
    }

1.2 Create the Service Contract 

  • Add the following code in the ProductService.cs class
   [ServiceContract] 
    public interface IProductService
    {
        [WebInvoke(Method="POST", UriTemplate="productreview")]
        [OperationContract]
        void SubmitReview (ProductReview pr);

        [ServiceKnownType(typeof(Rss20FeedFormatter))]
        [ServiceKnownType(typeof(Atom10FeedFormatter))]
        [WebGet(UriTemplate = "productreviews/feed/{type}")]
        [OperationContract]
        SyndicationFeedFormatter GetFeed(string type);
    }

1.3 Service Implementation

  • Add the following code in the ProductService.cs class
 [ServiceBehavior(InstanceContextMode=InstanceContextMode.Single)]
    public class ProductService : IProductService
    {
        List<ProductReview> Reviews = new List<ProductReview>();

        void IProductService.SubmitReview(ProductReview pr)
        {
            Reviews.Add(pr);
        }

        public SyndicationFeedFormatter GetFeed(string type)
        {
            SyndicationFeed feed = new SyndicationFeed()
            {
                Title = new TextSyndicationContent("Product reviews"),
                Description = new TextSyndicationContent("Product reviews submitted by buyers"),
                Items =
                    from review in Reviews
                    select new SyndicationItem()
                    {
                        Title = new TextSyndicationContent(review.ProductName),
                        Content = new TextSyndicationContent(review.Review)
                    }
            };

            if (type.Equals("rss"))
            {
                return new Rss20FeedFormatter(feed);
            }
            else
            {
                return new Atom10FeedFormatter(feed);
            }
        }
    }

1.4 Update App.config 

  • Updated the name of the service in App.config as given below:
     <service name="ProductServiceLibrary.ProductService">

1.5 Test Service 

  • Run the Service. 

2 Create a RESTful WCF Service Host

  1. Add a new project to the current solution: Right click Solution on Solution Explorer > Add > Add New Project
  2. Select Console Application template under Visual C# > Windows templates
  3. Change the project name to ConsoleHost and click OK
  4. In Solution Explorer, under ConsoleHost project, right click References and select Add Reference... 
  5. In the Reference Manager window, add reference to System.ServiceModel, System.ServiceModel.Web, and ProductServiceLibrary solution
  6. Add using System.ServiceModel;
  7. Add using System.ServiceModel.Web;
  8. Add using ProductServiceLibrary;
  9. Add the following code in Program.cs file
class Program
    {
        static void Main(string[] args)
        {
            WebServiceHost host = new WebServiceHost(typeof(ProductService));

            try
            {
                host.Open();
                Console.ReadKey();
                host.Close();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                host.Abort();
                
            }
            Console.ReadKey();
        }
    }

2.1 Configure Service

  1. Open App.config and add the following code
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
     <system.serviceModel>
        <services>
            <service name="ProductServiceLibrary.ProductService">
                <host>
                    <baseAddresses>
                        <add baseAddress="http://localhost:8733/Design_Time_Addresses/ProductServiceLibrary/ProductService" />
                    </baseAddresses>
                </host>
            </service>
        </services>
    </system.serviceModel>
</configuration>

2.2 Test the application 

  1. Right click on the ConsoleHost project and Set as StartUp project.
  2. Run Service Host


    3 Create a RESTful WCF Service Client

    1. Add a new project to the current solution: Right click Solution on Solution Explorer > Add > Add New Project
    2. Select Console Application template under Visual C# > Windows templates
    3. Change the project name to ConsoleClient and click OK
    4. In Solution Explorer, under ConsoleClient project, right click References and select Add Reference... 
    5. Add reference to ProductServiceLibrary, System.ServiceModel and System.ServiceModel.Web
    6. In the Program.cs file, 
      • add using System.ServiceModel; 
      • add using System.ServiceModel.Web;
      • add using System.ServiceModel.Web;
      • add using ProductServiceLibrary; 
    7. Add the following code
      class Program
      {
            static void Main(string[] args)
            {
                
                WebChannelFactory<IProductService> factory = new WebChannelFactory<IProductService>(
                    new Uri("http://localhost:8733/Design_Time_Addresses/ProductServiceLibrary/ProductService"));
                
    IProductService client = factory.CreateChannel();

                Console.WriteLine("Press 1 to Add | 2 to List All | 3 to List by Product | 0 to Exit");
                Console.Write("Select an option : ");
                string opt = Console.ReadLine();

                while (!opt.Equals("0"))
                {
                    switch (opt)
                    {
                        case "1":
                            Console.Write("Id:");
                            string id = Console.ReadLine();
                            Console.Write("Product Code:");
                            string code = Console.ReadLine();
                            Console.Write("Product Name:");
                            string name = Console.ReadLine();
                            Console.Write("Your Review:");
                            string review = Console.ReadLine();

                            ProductReview pr = new ProductReview();
                            pr.Id = id;
                            pr.ProductCode = code;
                            pr.ProductName = name;
                            pr.Review = review;

                            client.SubmitReview(pr);

                            Console.WriteLine("Thank you for your product review.");
                            break;
                       
                        default:
                            Console.WriteLine("Invalid option");
                            break;
                    }
                    Console.WriteLine();
                    Console.WriteLine("Press 1 to Add | 2 to List All | 3 to List by Product | 0 to Exit");
                    Console.Write("Select an option : ");
                    opt = Console.ReadLine();
                }
            }
        }

    3.1 Enabling Multiple StartUp projects 

    1. In solution explorer, right click on the solution and select Properties
    2. Select Multiple Startup Projects option in Common Properties > Startup Project
    3. For ConsoleHost project change the action to Start and for ConsoleClient project change the action to Start.
    4. Reorder ConsoleHost so that it is above ConsoleClient, therefore starts before ConsoleClient. 

    3.2 View using Internet Explorer 

    1. Open Internet explorer
    2. go to http://localhost:8733/Design_Time_Addresses/ProductServiceLibrary/ProductService/productreviews/feed/rss
    3. you should be able to see the feed. 


    References
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