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Web services at work
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of the web service provider The location is returned to the consumer, who then makes the remote call to the web service provider The provider services the request and returns the response to the consumer XML web services use HTTP, XML, and SOAP Since the protocols are easily transferred throughout the World Wide Web, XML web services are gaining in popularity and will ultimately replace many of the older standards, such as DCOM, CORBA, and so forth XML web services can be used by virtually any application since the technologies are platform-independent It is not always necessary to use XML web services XML web services operate at a higher level of networking, which requires extra overhead However, if you have little or no control over the location of the client or the server, you will find that the answer to platform limitations is to use XML web services The web service consumer must be able to create the messages that are destined for the web service and understand the messages that are returned from the web service Although it is possible to do the coding yourself, it is much easier to allow the NET Framework to build the proxy class that will encapsulate the message-parsing and creation code The idea behind a proxy is that it works on behalf of the application and acts as a go-between between the technology and the application
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WSDL (Web Services Description Language)
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The Web Services Description Language is used to describe a web service in terms of the messages that it creates and accepts The WSDL document is an XML file that contains the interface schema for the web service; it identifies the methods that are used in the exchange between a web service consumer and a web service provider Essentially, it is a file that contains a whole lot of definitions These are the elements in the WSDL document:
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Types These XML elements describe the various data types that are used to exchange messages between the consumer and the provider Message This XML element describes the actual message or method call portType binding service This element describes the set of operations and each related message The binding elements describe the protocol details This element groups a set of related ports together
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Unless you like to type, you can get the NET Framework to generate this file for you Let s look at creating a simple web service
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Creating a Web Service
We will use Visual Studio NET to create an XML web service, since it contains all of the tools to generate the surrounding documents For the full details on creating and consuming XML web services, refer to 28 We will use the web service that is created in that chapter for our example Follow these steps to create a simple web service provider: 1 Open a new ASPNET Web Service project in Visual Studio NET, and name it CImperial Be sure to locate the project on the localhost server (or your web server of choice) 2 Rename the file to Imperialasmx in the Solution Explorer
PART V
3 Remove the comments from the HelloWorld() method
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4 Test the web service (press F5) You will see the information page displayed in Internet Explorer, as shown in Figure 25-5 Notice the SOAP request and response code 5 Click the Invoke button, and you will see the XML document that represents the return value from the HelloWorld() method (see Figure 25-6)
Figure 25-5
The web service information page
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Figure 25-6
The XML document with the return value
Add the code to tell the service its namespace (see Figure 25-7) This step is required to locate the service correctly
7 Build and run the solution (F5) and click on the Service Description link that appears in the web browser You will see the WSDL file that has been created for you You can see in Figure 25-8 that the methods have been described in this file This document is the contract between the provider and the consumer of the web service
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