Programming Silverlight Applications with ASP.NET Services and AJAX in .NET

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Programming Silverlight Applications with ASP.NET Services and AJAX
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string[] images = new string[5]; public imageService() { //init Images for (int x = 1; x <= 5; x++) images[x-1] = image + x.ToString() + .jpg ; } [WebMethod] public int getCount() { return images.Length; } [WebMethod] public string getImage(int index) { return images[index]; } } }
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The code in Listing 10.2 simulates a service that might access a database to retrieve a list of image files and then exposes two functions as WebMethod services. For simplicity, the code simply creates an array of image filenames as if it had retrieved them from a database. The getCount() service simply returns the number of images available as an int. The getImage() service accepts an int argument index and uses that value to return a specific image filename from the images array as a string. You can test the Web services to verify that they are working by selecting the .asmx file in the Solution Explorer pane and pressing F5 to run the Web service. The Web service is loaded in the default browser, as shown in Figure 10.5. You can click one of the Web methods to load that method in the browser. Specify values for any parameters and click Invoke to execute the WebMethod and see the results.
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FIGURE 10.5 Testing the getImage() Web method in Visual Studio
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Programming Silverlight Applications with ASP.NET Services and AJAX
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Creating a Silverlight Application for ASP.NET Web Services
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In the previous section, you prepared an ASP.NET Web application to implement a Silverlight application that accesses an ASP.NET Web service. After the Web application is ready, you need to create a Silverlight application and link it to the ASP.NET Web application. Then a service reference to the WebService must be added to the Silverlight application project so that your Silverlight code is able to access the WebMethod services. In the following sections, you learn how to link the Silverlight application to the ASP.NET Web application in Visual Studio. Then you learn how to add a service reference to the WebService that is defined in the ASP.NET Web application project and access the WebMethod services from Silverlight.
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The first step in accessing an ASP.NET Web service from Silverlight is to provide the Silverlight assembly as part of the ASP.NET Web application project. This is necessary so that the ASP.NET Web page from Listing 10.1 can access the Silverlight application using the Source attribute. Creating a Silverlight link links the output of the Silverlight application to the output of the ASP. NET Web application so that the XAP file and any other output from the Silverlight application build are available to the ASP.NET Web application. Linking a Silverlight application to an ASP.NET Web application project can be accomplished in one of two ways depending on whether you are creating a new Silverlight application project. The following sections describe each method.
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If the Silverlight application does not already exist, right-click on ASP.NET Web Application in the Solution Explorer pane in Visual Studio and select Add New Item from the drop-down menu. Then select Silverlight Application from the available templates, specify the project name, and click Add to display the Add Silverlight Application dialog box, as shown in Figure 10.6. The Create a new Silverlight project and add it to the solution option will be set. Name the Silverlight project, specify the location to create it, and set the language option. Specify the Destination folder to store the output of the Silverlight application. The Destination folder refers to the path, relative to the output path of the ASP.NET Web application project, where the Silverlight application build output is placed.
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FIGURE 10.6 Adding a new Silverlight application in an ASP.NET Web application project
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When adding a Silverlight link, you do not need to select the Add a test page that references the control option because the Silverlight application is embedded in an ASP.NET Web page.
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Click Add to create the Silverlight link. Visual Studio creates a new Silverlight application and adds it to the solution as well as links the output of the Silverlight application to the output of the ASP. NET Web application.
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