An Extensive Examination of Web Services: Part 11

The .NET Framework makes creating and consuming Web Services a walk in the park. Creating a Web Service is as easy as marking a class with the WebService attribute; Web Services can be easily consumed because the .NET Framework includes tools to build proxy classes given a Web Service"s WSDL file. All of the examples we have seen in previous installments in this article series have consumed Web Services from server-side code. That is, a Web Service is consumed when a postback occurs and server-side code in an ASP.NET page creates an instance of the proxy class and invokes one of its methods.

In 2007 Microsoft released their free ASP.NET AJAX framework, which simplifies building AJAX-enabled ASP.NET applications (see An Introduction to AJAX and Atlas with ASP.NET 2.0 for more information). The ASP.NET AJAX framework is best known for its myriad of AJAX-enabled Web controls, but it also includes functionality to create and consume Web Services through client-side script. Best of all, the workflow for creating script-accessible Web Services is very similar to creating Web Services consumed through server-side .NET code. To mark a Web Service as being consumable from client script, simply add the ScriptService attribute; the service can be consumed through script via an auto-generated JavaScript proxy class.

In this article we"ll look at how to use Microsoft"s ASP.NET AJAX framework to consume Web Services from script. We will also examine how the low-level communication differs between Web Services consumed from .NET code versus Web Services consumed from JavaScript. Read on to learn more!
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>>Source Link
>>Blog: 4GuysFromRolla.com Headlines
>>Publish Date: 10/8/2007 10:20:24 PM
>>Keywords: web services

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