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You use this to establish whether sessions are allowed, not allowed, or required by this service contract.

Methods that you wish to use within the WCF framework must be attributed with the [OperationContract] attribute, which can also be configured with various named properties. You can use the properties shown in Table 25-7 to declare that a given method is intended to be one-way in nature, supports asynchronous invocation, requires encrypted message data, and so forth (again, many of these values might be ignored based on your binding selection). Table 25-7. Various Named Properties of the [OperationContract] Attribute

If you use Internet Explorer, I suggest you download and install the IE Developers Toolbar (wwwmicrosoftcom/downloads/en/detailsaspx FamilyID=95e06cbe-4940-4218b75d-b8856fced535), or if you re using Safari, try the built-in web inspector All three tools provide the ability to inspect the structure of the site and easily identify which CSS IDs and classes to apply styling to Figure 9-2 shows the types of information that Firebug for Firefox displays when inspecting a page..

Indicates whether the operation is implemented asynchronously using a Begin/End method pair on the service. This allows the service to offload processing to another server-side thread; this has nothing to do with the client calling the method asynchronously! Specifies whether this operation can be the initial operation in a session. Indicates whether the operation consists of only a single input message (and no associated output). Specifies whether the WCF runtime should attempt to terminate the current session after the operation completes.

For the initial example, you don t need to configure the ObtainAnswerToQuestion() method with additional traits; this means you can use the [OperationContract] attribute as currently defined.

Figure 9-2. Output generated by Firefox s Firebug tool Take a moment to download one of the tools if you don t already have it, and once installed, use the Inspection option to examine the structure of the HTML and the DIVs that were generated by Drupal.

Finally, recall that the use of interfaces is not required when building WCF service types. In fact, it is possible to apply the [ServiceContract] and [OperationContract] attributes directly to the service type itself: // This is only for illustrative purposes // and not used for the current example. [ServiceContract(Namespace = "http://MyCompany.com")] public class ServiceTypeAsContract

{ [OperationContract] void SomeMethod() { } [OperationContract] void AnotherMethod() { } } You can take this approach; however, you receive many benefits if you explicitly define an interface type to represent the service contract. The most obvious benefit is that you can apply a given interface to multiple service types (authored in a variety of languages and architectures) to achieve a high degree of polymorphism. Another benefit: You can use a service contract interface as the basis of new contracts (using interface inheritance), without having to carry any implementation baggage. In any case, your first WCF service library is now complete. Compile your project to ensure you do not have any typos.