Microsoft Certified Solutions Developer (MCSD) Certification Practice Test

Which attributes are used to define a WCF Web Service?

1. WebService and WebMethod

2. ServiceContract and OperationContract

3. Contract and ServiceOperation

4. ServiceDefinition and OperationDefinition

The correct answer is: ServiceContract and OperationContract

The correct answer is based on the key attributes used within Windows Communication Foundation (WCF) to define a web service. In WCF, attributes are crucial for specifying the contract, which defines the operations that the service exposes. The ServiceContract attribute is applied to a service interface to define the service's contract, essentially stating that this interface will be exposed by the WCF service to clients. It establishes the roles that the current service plays in the communication model. Similarly, the OperationContract attribute is used to decorate methods within a service contract interface, indicating that those methods can be called by clients. Each method marked with this attribute signifies that it is a callable operation in the WCF service. Together, these two attributes form the backbone of a WCF service's legal contract interface, allowing clients to understand how to interact with the service, what operations are available, and what parameters those operations require. This framework enables flexible and reliable service-oriented architecture. The other options do not correspond to the standard attributes utilized in WCF web services. For instance, WebService and WebMethod are associated with ASMX web services, while Contract and ServiceOperation, as well as ServiceDefinition and OperationDefinition, do not exist as recognized attributes within the W