This print for content only-size & color not accurate 7" X 9-1/4" / casebound / malloy

// To simulate a lengthy request. 

System.Threading.Thread.Sleep(5000);

return x + y;

}

}

}

Finally, open the supplied App.config file and replace all occurrences of IService1 with

IBasicMath, and all occurrences of Service1 with MathService. As well, take a moment to notice that

this *.config file has already been enabled to support MEX, and by default it is making use of the

wsHttpBinding protocol. 

Testing the WCF Service with WcfTestClient.exe

One benefit of using the WCF Service Library project is that when you debug or run your library, it

will read the settings in the *.config file and use them to load the WCF Test Client application

(WcfTestClient.exe). This GUI-based application allows you to test each member of your service

interface as you build the WCF service, rather than having to manually build a host/client as you

did previously simply for testing purposes. 

Figure 25-12 shows the testing environment for MathService. Notice that when you double-

click an interface method, you are able to specify input parameters and invoke the member. 

While this utility works out of the box when you have created a WCF Service Library project, be

aware that you can use this tool to test any WCF service when you start it at the command line by

specifying a MEX endpoint. For example, if you were to start the MagicEightBallServiceHost.exe

application, you would be able to specify the following command within a Visual Studio 2008 com-

mand prompt:

wcftestclient http://localhost:8080/MagicEightBallService

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Figure 25-12.

Testing the WCF service using WcfTestClient.exe

Once you do, you will be able to invoke ObtainAnswerToQuestion() in a similar manner.