data matrix generator c# Lesson 3: WCF Extensibility in C#.NET

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Lesson 3: WCF Extensibility
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Public Sub ApplyClientBehavior(operationDescription As _ OperationDescription, clientOperation As ClientOperation) _ Implements IOperationBehavior.ApplyClientBehavior End Sub // C# public void AddBindingParameters(OperationDescription operationDescription, System.ServiceModel.Channels.BindingParameterCollection bindingParameters) { } public void Validate(OperationDescription operationDescription) { } public void ApplyClientBehavior(OperationDescription operationDescription, ClientOperation clientOperation) { }
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The last method required by IOperationBehavior, ApplyDispatchBehavior, is integral to the correct functioning of the parameter inspection. It creates an instance of the parameter inspector and adds it to the list of inspectors maintained by the dispatch operation. 15. Add the following code to the PhoneNumberValidationAttribute class:
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' VB Public Sub ApplyDispatchBehavior(operationDescription As _ OperationDescription, dispatchOperation As DispatchOperation) _ Implements IOperationBehavior.ApplyDispatchBehavior Dim inspector As New PhoneNumberParameterValidator() dispatchOperation.ParameterInspectors.Add(inspector) End Sub // C# public void ApplyDispatchBehavior( OperationDescription operationDescription, DispatchOperation dispatchOperation) { PhoneNumberParameterValidator inspector = new PhoneNumberParameterValidator(); dispatchOperation.ParameterInspectors.Add(inspector); }
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Now that you ve created the attribute, the final step is to decorate the appropriate method in the contract. 16. In Solution Explorer, double-click the IContact file. 17. Locate the UpdatePhone method and add the PhoneNumberValidation attribute. When you are finished, the UpdatePhone method should look like the following:
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' VB <PhoneNumberValidation> _ <OperationContract> _ Sub UpdatePhone(ByVal newPhone As String)
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Instrumentation
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// C# [PhoneNumberValidation] [OperationContract] void UpdatePhone(string newPhone);
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18. Ensure that TestClient is set as the startup project and launch the application by pressing F5. You will be presented with a prompt asking for a phone number. 19. Enter 11 digits (an invalid phone number, according to the regular expression) and press Enter. An exception is raised on the service side. If you continue executing (by pressing F5 again), a message appears in the Console window, indicating that the phone number is invalid. 20. At the same prompt, enter a 10-digit number in the required format (a valid phone number as long as the first digit is not 0 or 1). The invalid format message doesn t appear, and you are prompted for the next phone number. Figure 6-9 illustrates the results from these last three steps.
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Figure 6-9
Results from Exercise 2
21. To finish running the application, press Enter without typing in a phone number.
Lesson Summary
The WCF message pipeline has numerous extensibility points. Parameters and messages can be inspected on both the client and service sides. On the service side, the operations that are executed can be affected through code injected into the pipeline.
Lesson 3: WCF Extensibility
Lesson Review
You can use the following questions to test your knowledge of the information in Lesson 3, WCF Extensibility. The questions are also available on the companion CD if you prefer to review them in electronic form.
NOTE
Answers
Answers to these questions and explanations of why each answer choice is correct or incorrect are located in the Answers section at the end of the book.
1. On the service side for a WCF application, which of the following extension points must have some extension functionality implemented also on the client side A. Message Inspection B. Message Formatting C. Parameter Inspection D. Operation Invoker 2. In a Message object, the MessageState property is set to Written. Which of the following must have already occurred A. The GetReaderAtBodyContents method has been called. B. The WriteBodyContents method has been called. C. The CreateBufferedCopy method has been called. D. The CreateMessage method has been called.
6
Instrumentation
Lesson 4: Monitoring WCF
Part of the instrumentation of any application (not just a WCF one) is health monitoring. Are all the necessary services running Is the data store reachable Is performance at an acceptable level These (and others) are questions an operations group considers critical to be able to answer. Ideally, there are ways to be notified when any of these states change. In this lesson, the focus is on the various ways information about the status of a WCF application can be communicated to an operations team.
After this lesson, you will be able to: Enable the performance counters supported by WCF. Log event information into the Windows Event Log and Windows Management Instrumentation Estimated lesson time: 20 minutes
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