Creating a Web server Silverlight application project that accesses SQL using LINQ in .NET

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Creating a Web server Silverlight application project that accesses SQL using LINQ
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The first step is to create a Silverlight application project in Visual Studio. You need to select the option Add a new Web to the solution for hosting the control and set the project type to Web Application Project, as shown in Figure 15.6. This is necessary so that you can create a WCF Web service to connect to the database.
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FIGURE 15.6 Creating a Web server Silverlight application in Visual Studio
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Two projects will be created in the Solution Explorer of Visual Studio, a Silverlight application project, and a Web server project.
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Adding an SQL Server Database to the project
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If you have not already created a database, you can add one to the project by right-clicking on the App_Data folder in the Web server project and choosing Add New Item from the pop-up menu. Then select SQL Server Database from the Templates list, as shown in Figure 15.7.
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Understanding Silverlight Frameworks
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FIGURE 15.7 Adding an SQL Server Database to a Silverlight Web server project in Visual Studio
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You can then use the Solution Explorer to add the necessary tables to the Database. In this example, we created a table named Movie and added columns for a Title, Rating, Year, and Available, as shown in Figure 15.8.
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FIGURE 15.8 Defining a movie table in an SQL database
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Adding a LinqToSql DataClass to the project
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After the SQL database you want to use for you application is in place, you need to add a LinqToSql DataClass object to the project. Right-click on the Web server project and choose Add New Item from the pop-up menu. Then select LINQ to SQL Classes from the Templates list, as shown in Figure 15.9.
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Using the Silverlight Data Framework
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FIGURE 15.9 Adding a LinqToSQL class to a Silverlight Web server project in Visual Studio
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This creates a file named DataClasses1.dbml in the project and displays the Designer for that project. Click the Server Explorer link in the DataClasses1.dbml Designer view to display a list of data connections, as shown on the left in Figure 15.10. Select the table from the database with which you want to interface from the list of data connections and drag it onto the designer, as shown on the right in Figure 15.10.
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FIGURE 15.10 Dragging a database table onto the Design pane of a data class in Visual Studio
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Understanding Silverlight Frameworks
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Set the LinqToSql class serialization to unidirectional
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You will need to set the LinqToSql class to be serializable before you can use it in the Web service. To make the class serializable, click on the Design pane of the DataClasses1.dbl file and select properties from the drop-down list to display the Properties pane, as shown in Figure 15.11. Set the Serialization Mode property from None to Unidirectional.
FIGURE 15.11 Setting the Serialization Mode property of a data class in Visual Studio
Create a Web service to access the database
Now that the LinqToSql class is created and wired up, you need to create a database to access the database. Right-click on the Web server project and choose Add New Item from the drop-down menu. Then select WCF Service from the Templates list. Leave the default name. This creates three new files in your project IService1.cs, Service1.sfc, and Service1.svc.cs. Open the IService1.cs file in Visual Studio and replace the basic DoWork() contract with the following code (or your own contract if you are implementing a different database), as shown in Listing 15.9:
[ServiceContract] public interface IService1 { [OperationContract] List<Movie> GetMoviesByTitle(string mTitle); }
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This implements a contract that returns a List object using a method. Now you need to implement that method in the Service1.svc.cs file. There is a shortcut to this in Visual Studio. Open the Service1.svc.cs file in Visual Studio, right-click on the IService1 interface, and choose Implement Interface Implement Interface from the drop-down menu, as shown in Figure 15.12. This should create skeleton code similar to the following:
public List<Movie> GetMoviesByTitle(string mTitle) { throw new NotImplementedException(); }
FIGURE 15.12 Implementing a service interface for a service contract in Visual Studio
This is where the LINQ query needs to be added to access the database. Replace the throw statement in the function with the following code or your own code that implements a LINQ query, as shown in Listing 15.10:
DataClasses1DataContext db = new DataClasses1DataContext(); var movies = from m in db.Movies where m.Title.Contains(mTitle) select m; return movies.ToList();
Fix up the Web.config file
For some reason, Visual Studio insists on binding Silverlight applications using wsHttpBinding; however, Silverlight only supports using basicHttpBinding. Open the Web.config file for the project and replace the following code: