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Programming the Web with AJA X and JSON
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new capabilities can be used by replacing the endpoint behavior con guration element con guration element with the We created a sample ASPNET AJAX application called the XBOX 360 binding and the Game Review to see how we can use the to build AJAX-based applications This simple Web application enables users to provide reviews about their favorite XBOX 360 game The application was built using an ASPNET AJAX Web site project template in Visual Studio 2008 Figure 132 shows a picture of this Web site
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Figure 132 XBOX 360 Game Review AJAX-enabled application
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This site has a number of features First is a list of games that is discontrol to the user Users can select a game and see a list played in a of comments for each game Then a user can add comments for the each game Listing 137 lists the service that provides this functionality
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Listing 137
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13: Programmable Web
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Listing 137 continued
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We chose to host this service within Internet Information Server (IIS) used to host the service Listing 138 shows the
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Listing 138
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Listing 139 shows the con guration information used to host the The most important aspect of this con guration inforbinding and the mation is the use of the endpoint behavior This enables the use of JSON and generates the neceswith ASPNET sary client-side proxy code for the
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Listing 139
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13: Programmable Web
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Listing 139 continued
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You con gure the to be used with ASPNET by Listing adding a reference to the service using the ASPNET Behind 1310 shows the markup used to reference the the scenes this is generating client-side script that references a JavaScript le with the client-side proxy For our example, the URI to the client-side JavaScript is http://localhost/GameReviewService/GameReviewService svc/js
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Listing 1310 Referencing Services Using ASPNET
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We have included the ASPNET Web form used to build the XBOX 360 Game Review Web application This shows how the services are called from client-side script and how the results are used to dynamically populate controls
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Listing 1311 Making Client-Side Proxy Calls
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Listing 1311 continued
Using the
Using the
One common thing to do when hosting services using the binding is to read or write to the HTTP context This can be done using the class There are a variety of reasons to access the HTTP context You might want to read custom authentication or authorization headers, control caching, or set the content type, for example Figure 133 shows a Web application that displays wallpaper images on the current machine The entire application is built using a WCF service and is accessible using any Web browser
13: Programmable Web
Figure 133 Wallpaper Web application
Listing 1312 shows code for the service There is an operation that displays an HTML page of all images This operation header so that the browser interprets the output as sets the header so that additional images can HTML It also sets the be added to the application without the browser caching the display operation that returns an image to the browser Finally, there is an and header This operation sets both the
NOTE
Taking the svc Out of REST
WCF Services hosted in IIS use the extension This does not follow common REST URI naming practices For example, the service in Listing 1312 is accessed using the following URI: http://localhost/Wallpaper/WallpaperServicesvc/images You can remove the extension by using an ASPNET (with IIS 70 only) to call to modify the URI This would allow the URI to take the following form: http://localhost/Wallpaper/WallpaperService/images
Using the
Listing 1312 Wallpaper Image Service
13: Programmable Web
Listing 1312 continued
Using the
13: Programmable Web
Listing 1312 continued
Using the
The following con guration in Listing 1313 is used to host the service The service is hosted using the binding and the endpoint behavior
Listing 1313 Wallpaper Image Service Configuration
Listing 1314 shows the in IIS
Listing 1314
le used to host the
13: Programmable Web
Hosting for the Web
Arguably one of the best improvements in WCF is the feature for hosting services on the Web Prior to NET Framework 35, you had to provide con guration or write code to host services This was true even if you hosted your services within IIS This became tedious for those hosting services on the Web There are many capabilities offered by WCF to host services, but only a limited con guration was used by Web developers building services For example, you would not expect an AJAX-based application to support multiple bindings, use message-level security, or require transactions To simplify hosting of services, WCF introduced a feature called Con guration Free Hosting This allows developers to host services without providing con guration or writing any code The infrastructure for this feature was always a part of the hosting model within WCF We will examine two ways to use this feature
There is a new class available in the nameclass This class allows for selfspace called the binding and the hosting of services using the endpoint behavior The advantage to using class is that you do not have to provide any this class over the binding or behaviors to host a service
Another class in the namespace, called class, is meant to be used with IIS the les It allows for hosting of services in IIS using the hosting and binding and the endpoint behavior without the need for con guration Listing 1315 shows an exam le that uses the class This is ple of an le used to host the service shown in Listthe same ing 1312 The advantage of this approach is that the con guration information shown in Listing 1313 is no longer required to host the service