Implementing a Client for a WCF Ser vice in .NET

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Implementing a Client for a WCF Ser vice
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case, the address is an address hosted by an IIS server, the binding is , and the contract is the interface Finally, the client creates the channel to establish communication with the service and calls a method on the service
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Listing 16 WCF Client Entirely in Code
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Writing a Client with Code and Configuration Back in 2001, Visual Studio introduced Add Web Reference, which in just three words reduced a major undertaking in distributed computing to a right-click This was a good thing, because it delivered an entry point to scalable, standards-based distributed computing to most professional developers But in making distributed computing so accessible, it hid many
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of the important complexities Visual Studio 2008 continues to support Add Web Reference for compatibility with ASMX and other Web services, but also introduces Add Service Reference (ASR) to support WCF Because WCF is protocol independent and supports a variety of serialization, encoding, and security mechanisms, ASR offers great exibility in providing support for manageability, performance, and security The ASR feature of Visual Studio is used to obtain metadata from a WCF service and generate a proxy class and con guration le, as shown in Fig, which invokes a serure 14 Behind the scenes, ASR calls vice s MEX endpoint to query for its interfaces and to generate a proxy class and con guration le The proxy class enables the client to access the service operations as if they were methods of a local class The proxy class uses WCF classes to build and interpret SOAP messages according to the contract de ned by the service endpoint The con guration le stores the ABCs of the service There are two steps to writing a client that invokes a service: rst, generate a con guration le and the proxy class, and second, write code that uses the proxy class to invoke the service To use ASR within Visual Studio 2008, right-click the Service References node within the Solution Explorer and then select Add Service Reference from the context menu This will launch a dialog box shown in Figure 15 This dialog calls the svcutil utility to create a source code le that implements the proxy class in the language of the project It also creates an le with a node that stores the address, binding, and contract information necessary to call the endpoints utilAs an alternative to using ASR, you can also use the ity directly This utility, found in the C:\Program Files\Microsoft SDKs\ Windows\v60\Bin folder, takes many switches, and help is available by switch from the command line The utility accepts metadata using the as input and can produce various forms of output The metadata can come from the DLL that implements the class, from a WSDL le, or from the WSDL returned by a WS-Metadata call to a running service Listing 17 to generate metadata from the service shows how to use de ned in Listings 14 and 15
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Figure 15 Visual Studio generating client proxy class and configuration file
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Listing 17
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Regardless of which technique is used to generate the proxy and conproduces the same result Listing 18 shows the guration le, con guration le Note that the client-side con guration le is quite a bit more verbose than the services from which it was generated (refer to Listing 13) This gives the client the exibility to override speci c attributes, such as timeouts, buffers, and client-supplied security credentials
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Listing 18 Generated from
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Listing 18 continued
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After the con guration le and proxy class are generated, invoking a request-response service operation is quite simple The name of the proxy class is the name of the ServiceContract appended with Client The name of proxy class for the service de ned in Listings 14 and 15 is The client code creates an instance of the proxy class and then calls a method on that class Listing 19 shows the code
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