Create a WCF service that responds to HTTP GET or HTTP POST requests

1. Define a basic WCF service contract with an interface marked with the ServiceContractAttribute attribute. Mark each operation with theOperationContractAttribute. Add the WebGetAttribute attribute to stipulate that an operation should respond to HTTP GET requests. You can also add theWebInvokeAttribute attribute to explicitly specify HTTP POST, or not specify an attribute, which defaults to HTTP POST.

   [ServiceContract] public interface IMusicService {     //This operation uses a GET method.     [OperationContract]     [WebGet]     string LookUpArtist(string album);      //This operation will use a POST method.     [OperationContract]     [WebInvoke]     void AddAlbum(string user, string album);      //This operation will use POST method by default     //since nothing else is explicitly specified.     [OperationContract]     string[] GetAlbums(string user);      //Other operations omitted…  } 

2. Implement the IMusicService service contract with a MusicService.

   public class MusicService : IMusicService {     public void AddAlbum(string user, string album)     {         //Add implementation here.     }       //Other operations omitted… } 

3. Create a new file named service with a .svc extension in the application. Edit this file by adding the appropriate @ServiceHost directive information for the service. Specify that the WebScriptServiceHostFactory is to be used in the @ServiceHost directive to automatically configure an ASP.NET AJAX endpoint.

   <%@ServiceHost      language=c#      Debug="true"      Service="Microsoft.Ajax.Samples.MusicService"     Factory=System.ServiceModel.Activation.WebScriptServiceHostFactory %> 

To call the service

1. You can test your service's GET operations without any client code, by using the browser. For example, if your service is configured at the "http://example.com/service.svc" address, then typing "http://example.com/service.svc/LookUpArtist?album=SomeAlbum" into the browser address bar invokes the service and causes the response to be downloaded or displayed.

2. You can use services with GET operations in the same way as any other ASP.NET AJAX services - by entering the service URL into the Scripts collection of the ASP.NET AJAX Script Manager control. For an example, see the Basic AJAX Service.