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Public Function Divide( _ ByVal numerator As Double, ByVal denominator As Double) _ As Double Implements ICalculatorService.Divide If denominator = 0D Then Dim faultDetail As String faultDetail = "You cannot divide by zero" Dim fex As FaultException(Of String) fex = New FaultException(Of String)(faultDetail) Throw fex End If Return numerator / denominator End Function End Class // C# [ServiceContract()] public interface ICalculatorService { [OperationContract()] [FaultContract(typeof(string))] double Divide(double numerator, double denominator); } public class CalculatorService : ICalculatorService { public double Divide(double numerator, double denominator) { if (denominator == 0.0d) { string faultDetail = "You cannot divide by zero"; throw new FaultException<string>(faultDetail); } return numerator / denominator; } }
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A few final comments are apropos before ending this section: For simplicity s sake, this simple example used only a string type for its fault detail type because you have yet to learn about Data contracts. In most cases, you would use some form of a Data contract, as shown in the lab for Lesson 2, Defining Structural Contracts, of this chapter. The details of how faults are handled on the client proxy side are covered in 4, Consuming Services.
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Lesson 1: Defining Behavioral Contracts
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MEPs describe the protocol of message exchanges a consumer must engage in to converse properly with the service. For instance, if a consumer sends a message, it needs to know whether it should expect a message back or whether simply sending the request is enough. Further, can the consumer expect unsolicited messages back from the service WCF supports the following three MEPs, each of which is covered in more detail in this section: Request/Response OneWay Duplex
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This is by far the most common MEP and very little has to be done to set it up because the default value for the IsOneWay property of OperationContractAttribute is false. Thus, as long as you don t have IsOneWay set to true, and you are not in a Duplex channel setting, you are using Request/Response. Note that it doesn t even necessarily mean that you have a non-void return type. That is to say, even with a void return type, if you are using Request/Response, then a response message is still going back to the consumer when the operation is called; it just would have an empty SOAP body. Also, this two-way communication channel enables the service to issue faults (if anything goes wrong), return transaction contexts, or both. (See 11, Transactional Services, for transactions.) In the following code sample, both operations are configured to use the Request/Response MEP:
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' VB <ServiceContract()> _ Public Interface ILogisticsService <OperationContract()> _ Function SubmitWorkOrder( _ ByVal workOrder As WorkOrder) _ As WorkOrderAcknowledgement <OperationContract()> _ Sub CancelWorkOrder( _ ByVal workOrderNumber As Integer) End Interface // C# [ServiceContract()] public interface ILogisticsService { [OperationContract()] WorkOrderAcknowledgement SubmitWorkOrder(WorkOrder workOrder); [OperationContract()] void CancelWorkOrder(int workOrderNumber); }
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1
Contracts
Finally, all WCF bindings except the MSMQ-based bindings support the Request/Response MEP. (See 2, Exposing the Services, for more about bindings.)
OneWay
Sometimes, you simply want to send a message off to a service and have it trigger some sort of business logic, and you aren t in fact interested in receiving anything back from the service. In such cases, you might want to use the OneWay MEP, that is, have the consumer simply send one-way messages into the service endpoint without any responses back from the service. This MEP is declared by setting the IsOneWay property on the OperationContractAttribute to true. The following shows an example of this:
' VB <ServiceContract()> _ Public Interface ILogisticsService <OperationContract(IsOneWay:=True)> _ Sub CancelWorkOrder( _ ByVal workOrderNumber As Integer) End Interface // C# [ServiceContract()] public interface ILogisticsService { [OperationContract(IsOneWay=true)] void CancelWorkOrder(int workOrderNumber); }
However, you must keep the following points in mind when considering whether the OneWay MEP is the right choice for you: It cannot be used in conjunction with the FaultContract attribute because for a service to issue faults, it must have a two-way channel of some form, which is not the case with one-way messaging. Nor can it return transaction contexts. (Again, see 11 for transactions.) It can be dangerous just to send off a one-way message and not have some assurances that it arrived and was processed. So, with that in mind, if an MSMQ binding is feasible in your environment, you might want to use OneWay messaging only when you can couple it with queued message delivery. Note also that, if you want queued message delivery, the OneWay MEP is your only choice, at least as far as the WCF infrastructure is concerned. Also be aware that it does not conform to the asynchronous, send-and-forget semantics that one might think it does, given the name one-way. In other words, given the oneway nature of the channel, one might think that as soon as the consumer sends the
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