With the Q1 release of Telerik
OpenAccess ORM, Telerik released a brand new LINQ
Implementation and supporting Visual Entity Designer. With the upcoming Q2 release
next month, we will introduce full WCF
RIA Services support. If you want to get started now you can wire up the services
yourself pretty easily. Let’s take a look at how to get your feet wet with RIA Services
and Telerik’s LINQ implementation.
Before you get started, you will need a few things installed:
Getting Started: The Easy Stuff
Let’s create a new Silverlight application first. In the New Silverlight Application
dialog, check the “Enable WCF RIA Services” checkbox. This will enable RIA Services.
The next step is to create a new Telerik Domain Model in the server (ASP.NET) project.
I have a detailed walk through here on
how to do that. We’ll create a new Domain Model by right clicking on the server project
and selecting “Add” and choosing the Telerik Domain Model from the menu. Then we will
map all of the tables from Northwind using the wizard. We’ll also keep the default
model name of NorthwindEntityDiagrams.
We’re in good shape. So far if you have used the new LINQ Implementation nothing is
new (or LINQ to SQL/EF for that matter.) Now let’s add the RIA Services stuff.
Since our RIA Services support is still beta, you have to wire up a few things manually,
including some references. You need to add:
Now we are ready to create the domain class.
Creating the Domain Class
Add a new Domain Service Class by right clicking and selecting Add|New Item and choose
Domain Service Class.
Accept the defaults in the dialog and then we are ready to go. (Note at this time
OpenAccess does not support creation of the class for metadata, but will soon, possibly
even before Q2.)
Once you accept this dialog, a new empty class is generated.
2: public class DomainService1
We need to add a using statement so we can make sure our DomainService uses the OpenAccess
model: using Telerik.OpenAccess;
Now change the inheritance of DomainService1 to this:
2: public class DomainService1
Now we have one last step to create our DomainService, we have to add the CRUD methods.
(In the future all of this will be done automatically for you!)
2: public IQueryable<Customer>
4: return this.DataContext.Customers;
7: public void InsertCustomer(Customer
12: public void DeleteCustomer(Customer
These are the methods of your DomainService. You can also add business logic here.
Let’s do that with our GetCustomers() query. I will write some business logic
that filters all of the customers by the country of Germany. Of course you would have
more complex business logic here, however, I just want to demonstrate the point. All
clients that use this DomainService will inherit this business logic, even if you
expose your service as an OData feed. Our implementation is here:
1: public IQueryable<Customer>
3: return this.DataContext.Customers
4: .Where(c=> c.Country=="Germany")
5: .OrderBy(c=> c.CustomerID);
Now you are done. Compile and let’s get cracking on a Silverlight client.
Creating the Silverlight Client
This is the easy part. We’ll use the RIA Services drag and drop features. Open MainPage.XAML
in the Silverlight application and in the Data Sources window, drag and drop the Customer
entity to the XAML form. (Tip: if the Data Sources window is blank or not showing
up, you can manually force it to come up via the “Data” menu option on the main menu
in Visual Studio.)
Once you drag and drop the entity to the form, a grid will automatically show up.
Now press F5 and see the application running.
That's it! We just created an OpenAccess based RIA Services application!
Of course there is a lot more to RIA Services than just binding a grid, however, this
demonstration should show you that once you create your DomainService class, all of
the RIA Services “stuff” just works for you. In future posts we will look at more
RIA Services features as well as creating a query method.
Stephen Forte sits on the board of several start-ups including Triton Works. Stephen is also the Microsoft Regional Director for the NY Metro region and speaks regularly at industry conferences around the world. He has written several books on application and database development including Programming SQL Server 2008 (MS Press).
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