WCF RIA Services in VB.NET

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[Display(Name="Birth Date")] public DateTime BirthDate { get; set; } [Required] [Display(Name = "Hire Date")] public DateTime HireDate { get; set; } [Required] public string LoginID { get; set; } [Required] public string MaritalStatus { get; set; } [Required] [StringLength(1)] [RegularExpression("[MFmf]", ErrorMessage = "Specify (M)ale or (F)emale, please")] public string Gender { get; set; } [Required] public bool SalariedFlag { get; set; } [Required] public int VacationHours { get; set; } [Required] public int SickLeaveHours { get; set; } [Required] public bool CurrentFlag { get; set; } }
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In this listing, you create an aggregate Employee class that includes fields from both the Employee and Contact classes you ve been using so far. Also, because the metadata is no longer inferred from the database or read using the metadata buddy class you previously created, you add a minimum amount of metadata to ensure that required fields are marked as such and to make a few of the names easier to read. In your own classes, you ll need to make sure you account for required fields. If you can t infer them when performing an insert or update operation, you ll need to include them in the class so the user can input their values. This new class now abstracts you from the database. If the structure of the database changes, you can change the query and update operations the UI won t be affected (assuming it s a structural change, not a change in what defines an employee). The next step is getting this information down to the client. To do that, you ll need to create at least one query operation and wire it through all the way to the DomainDataSource you ve been using.
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17.5.2 Supporting query operations
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The presentation model approach requires a completely new domain service and new query and update operations. The new domain service class will no longer be directly based on the LinqToEntitiesDomainService base class, but will instead be based directly on the DomainService base class. For lack of a better name, I called the domain service EmployeeContactService, because it aggregates both the Employee and Contact entities. Create a new class file with this name, and place it in the Services folder on the server project. Listing 17.5 contains the code for this service.
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Loose coupling: using presentation models Listing 17.5 The EmployeeContactService
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[EnableClientAccess] public class EmployeeContactService : DomainService { private AdventureWorksEntities _context = new AdventureWorksEntities(); public IQueryable<EmployeePresentationModel> GetEmployees() { return from e in _context.Employees orderby e.Title, e.HireDate select new EmployeePresentationModel() { BirthDate = e.BirthDate, ContactID = e.ContactID, CurrentFlag = e.CurrentFlag, EmailAddress = e.Contact.EmailAddress, EmailPromotion = e.Contact.EmailPromotion, EmployeeID = e.EmployeeID, FirstName = e.Contact.FirstName, LastName = e.Contact.LastName, NameStyle = e.Contact.NameStyle, NationalIDNumber = e.NationalIDNumber, Phone = e.Contact.Phone, SalariedFlag = e.SalariedFlag, SickLeaveHours = (int)e.SickLeaveHours, Title = e.Title, HireDate = e.HireDate, Gender = e.Gender, VacationHours = (int)e.VacationHours }; } }
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The main code in this function performs a standard mapping of properties from two entities to one other. Note that even with the custom methods, you re still able to return IQueryable and to allow composition on the client.
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WIRING UP TO THE UI
Because you have the same query name as you used in the EmployeeService domain service, to use the new service from the UI, you need to make only one changechange the DomainContext property of the DomainDataSource to point to the EmployeeContactContext:
<riaControls:DomainDataSource.DomainContext> <!--<domain:EmployeeContext />--> <domain:EmployeeContactContext /> </riaControls:DomainDataSource.DomainContext>
Be sure to build before making this change; otherwise, the EmployeeContactContext class won t exist on the client. Note that you didn t have to update any service references or add a new service reference the WCF RIA Services tooling took care of that for you. That alone is worth the price of admission.
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