C# 4 and .NET 4

1108 ❘ ChaPTer 38 silverliGht
using System.Collections.Generic;
using System.Data.Services;
using System.Data.Services.Common;
using System.Linq;
using System.ServiceModel.Web;
namespace Wrox.ProCSharp.Silverlight.Web
{
public class EventRegistrationDataService :
DataService
{
public static void InitializeService(DataServiceConfiguration config)
{
config.SetEntitySetAccessRule("Events", EntitySetRights.AllRead);
config.SetEntitySetAccessRule("Attendees", EntitySetRights.All);
config.SetServiceOperationAccessRule("AddAttendee",
ServiceOperationRights.All);
config.DataServiceBehavior.MaxProtocolVersion =
DataServiceProtocolVersion.V2;
}
code snippet SilverlightDemos.Web/EventRegistrationDataService.svc.cs
To make an operation available for registration of an attendee using WCF Data Services that is
more complex than just adding a new record, the method AddAttendee() is added to the class
EventRegistrationDataService. The WebGet attribute specifies that the method can be accessed
with an HTTP GET request. For POST, PUT, or DELETE requests, the WebInvoke attribute can be
used. Within the InitializeService() method, access is given to this operation with the method
SetServiceOperationAccessRule(). AddAttendee() receives attendee information with separate
parameters and first verifies that the registrationCode exists before writing the attendee to the
Attendees table that is mapped from the Entity Data Model. Using separate parameters with this method
instead of using an Attendee object is required to call this method with an HTTP GET request.
}
}
[WebGet]
public bool AddAttendee(string name, string email, string company,
string registrationCode, int eventId)
{
if ((from rc in this.CurrentDataSource.RegistrationCodes
where rc.RegistrationCode1 == registrationCode
select rc).Count() < 1)
{
return false;
}
else
{
var attendee = new Attendee {
Name = name,
Email = email,
Company = company,
RegistrationCode = registrationCode,
EventId = eventId
};
this.CurrentDataSource.Attendees.AddObject(attendee);
return !(this.CurrentDataSource.SaveChanges() < 1);
}
}
Adding a service reference to the Silverlight control project EventRegistration makes it possible to use the
WCF Data Services client classes to access the service. The method OnNavigatedTo() is now changed to use
the generated proxy from the Data Services client instead of the pure WCF proxy used earlier.
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