WCF RIA SERVICES AND SILVERLIGHT FOR MOBILE in VB.NET

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WCF RIA SERVICES AND SILVERLIGHT FOR MOBILE
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[EnableClientAccess()] public class ApressBooksService : LinqToEntitiesDomainService<ApressBooksEntities> { // TODO: // Consider constraining the results of your query method. // If you need additional input you can // add parameters to this method or create additional query //methods with different names. // To support paging you will need to add ordering to the 'Books' //query. public IQueryable<Book> GetBooks() { return this.ObjectContext.Books; } }
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Reading and Displaying Data from the Data Source
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Now let s map this data to a DataGrid control. For that, first make sure you compile the project to expose the added domain service as a Data Source, as shown in Figure 13-12. Note that if you do not get the Data Sources window automatically, click the Data menu item and click the Show Data Sources option. As shown in Figure 13-12, you will notice that two data sources are available. One is chapter13.Web.UserRegistrationContext.datasource, which is automatically created as part of the Silverlight Business Application template to facilitate user registration with all the fields you have entered to add and register as a new user (see Figure 13-7) supporting user registration domain service. User registration is part of the App_Data database, which is automatically created and is hidden. You can see it under the web project if you click the Show All Files option available under the Solution Explorer window. The second data source is chapter13.Web.Services.ApressBooksContext.datasource, which you have recently created to support required CRUD operations for the ApressBooks.mdf database.
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Figure 13-12. Domain data sources of the project
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Then add a Grid control to the Home.xaml page available under the Views folder of the chapter13 project. Set appropriate properties to make it of appropriate height and width, and set the AutoGenerateColumns property to true. Now visit the Data Sources window and drag and drop the Book data source to the Grid. If you have design and XAML windows opened side by side, you will notice that dropping the Book data source to the Grid will automatically generate all of the required domain data source code and bind to the Grid. Just run the project and you should see all Books table data populated to the home screen, as shown in Figure 13-13.
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Figure 13-13. Data population using WCF RIA Services and domain data source If you visit the Home.xaml file, a reference to System.Windows.Controls.DomainServices along with references to the project WCF services and data models are added at the control level, as shown here in the highlighted bold fonts: <navigation:Page x:Class="chapter13.Home" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/ markup-compatibility/2006" xmlns:navigation="clr-namespace:System.Windows.Controls;assembly= System.Windows.Controls.Navigation" mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480" Style="{StaticResource PageStyle}" xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/
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WCF RIA SERVICES AND SILVERLIGHT FOR MOBILE
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presentation/sdk" xmlns:riaControls="clr-namespace:System.Windows.Controls; assembly=System.Windows.Controls.DomainServices" xmlns:my="clr-namespace:chapter13.Web.Services" xmlns:my1="clr-namespace:chapter13.Web.Models"> And you will see that the following code has been added to create a Domain Data Source, add the Domain Context, and then define the initial GetBooksQuery to retrieve all records from the Books table and map it to the Grid control. <sdk:DataGrid AutoGenerateColumns="True" Name="Books" MinHeight="150" ItemsSource= "{Binding ElementName=bookDomainDataSource, Path=Data}"/> <riaControls:DomainDataSource AutoLoad="True" d:DesignData="{d:DesignInstance my1:Book, CreateList=true}" Height="0" LoadedData="bookDomainDataSource_LoadedData" Name="bookDomainDataSource" QueryName="GetBooksQuery" Width="0"> <riaControls:DomainDataSource.DomainContext> <my:ApressBooksContext /> </riaControls:DomainDataSource.DomainContext> </riaControls:DomainDataSource> You can enhance this example by providing filters to the query and adding existing queries to the data domain service class. If you have large data, you can enhance the user experience by providing paging, search, or other business-specific functionalities.
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Updating Data to the Data Source
You can extend the application to perform create, update, and delete operations. Remember that you start updating data at the client side, and you must save the changes to the server by explicitly submitting the changes. The easiest way to implement is to call the DomainDataSource.SubmitChanges() method to save the updates and call the DomainDataSource.RejectChanges() method to cancel the changes.
Additional References
Visit the following links to get additional references on this topic: A video by Tim Heuer explaining WCF RIA Services support in Visual Studio 2010: www.silverlight.net/learn/videos/all/ria-services-support-visual-studio2010/ A video by Tim Heuer explaining the WCF RIA Services implementation approach to perform CRUD operations: www.silverlight.net/learn/videos/all/net-riaservices-intro/ Online documentation on WCR RIA Services: http://msdn.microsoft.com/enus/library/ee707344.aspx. This documentation also provides a great overview of how to troubleshoot and deploy RIA Services solutions, as well as security aspects of RIA Services solutions.
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