c# wpf print barcode Lesson 3: WCF Extensibility in C#

Printing ECC200 in C# Lesson 3: WCF Extensibility

Lesson 3: WCF Extensibility
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15. In Solution Explorer, right-click the TestClient project, choose Add, and then select Class from the context menu. 16. In the Add New Item dialog box, change the name to TraceMessageBehaviorExtension and click the Add button. 17. Add the following statements to the top of the file:
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' VB Imports System.ServiceModel.Configuration // C# using System. ServiceModel.Configuration;
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You must derive the just-added class from the BehaviorExtension class. 18. Change the class declaration to read as follows:
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' VB Public Class TraceMessageBehaviorExtension Inherits BehaviorExtensionElement // C# public class TraceMessageBehaviorExtension : BehaviorExtensionElement
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For a class to inherit the BehaviorExtension class, it must override two elements. The first is the BehaviorType property. This property returns the type associated with this extension. For this exercise, that is the TraceMessageBehavior type. 19. Add the following code to the TraceMessageBehaviorExtension class:
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' VB Public Overrides ReadOnly Property BehaviorType() As Type Get Return GetType(TraceMessageBehavior) End Get End Property // C# public override Type BehaviorType { get { return typeof(TraceMessageBehavior); } }
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The second required element is the CreateBehavior method. This method returns an instance of the behavior. 20. Add the following method to the TraceMessageBehaviorExtension class:
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' VB Protected Overrides Function CreateBehavior() As Object Return New TraceMessageBehavior() End Function // C# protected override object CreateBehavior()
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Instrumentation
{ return new TraceMessageBehavior(); }
Now that you ve created the classes, you must add them to the WCF pipeline. Do this through changes to the application configuration file. 21. In Solution Explorer, double-click the app.config file for the TestClient project. 22. To start, add a definition for the extension. Add the following XML segment to the system .serviceModel element.
CAUTION
Type value must be on a single line
One warning about this XML segment: the type attribute has been split across two lines to fit on the printed page. When you add this XML to the app.config file, the value of the type attribute must be on a single line:
<extensions> <behaviorExtensions> <add name="messageTracer" type="TestClient.TraceMessageBehaviorExtension, TestClient, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"/> </behaviorExtensions> </extensions>
23. After you define the extension, the behavior is associated with an endpoint behavior. Add the following XML segment to the system.serviceModel element:
<behaviors> <endpointBehaviors> <behavior name="MessageTracingBehavior"> <messageTracer /> </behavior> </endpointBehaviors> </behaviors>
Finally, the endpoint behavior needs to be associated with the binding. Do this by adding a behaviorConfiguration attribute to the endpoint element. The value of the attribute will match the name attribute in the behavior element. The endpoint element will look like this:
<endpoint address= "http://localhost:8731/Design_Time_Addresses/DemoService/UpdateService/" binding="wsHttpBinding" bindingConfiguration="IContact" contract="DemoService.IContact" name="IContact" behaviorConfiguration="MessageTracingBehavior">
24. Although the application is ready to be executed, the Output window must be visible to see the messages. If it is not already visible, from the Debug menu in Visual Studio 2008 choose Window and then Output.
Lesson 3: WCF Extensibility
25. Ensure that the TestClient is set as the startup project, and then launch the application by pressing F5. After a few seconds, the Console window will show the results of the call, and the messages that complete the application will be visible in the Output window. Exercise 2 Validate Parameters by Using Inspectors Inspectors are not just for messages. It s possible to inject inspectors into the WCF pipeline so that they are invoked when parameters are being built for passing to the operation. In this way, it becomes possible to examine the password values and abort the processing before the operation is called. In this exercise, you evaluate an incoming parameter, using a regular expression that defines what a valid phone number should look like. 1. Navigate to the <InstallHome>/6/Lesson3/Exercise2/<language>/Before directory and double-click the Exercise1.sln file to open the solution in Visual Studio. The solution consists of two projects. They are as follows: The DemoService project, a simple WCF service library that implements the IContact interface. This interface consists of a single method (UpdatePhone) that would (theoretically) update a data store with a new phone number. For this exercise, it simply emits the new number into the Trace subsystem. The TestClient project, a Console application that enables you to consume the DemoService service. It prompts for user input (ostensibly a phone number) and sends it to the UpdatePhone operation on the service. The starting point is the creation of the inspector class that will perform the validation. 2. In Solution Explorer, right-click the DemoService project. Choose Add, and then select Class from the context menu. 3. In the Add New Item dialog box, change the name of the class to PhoneNumberParameterValidator and click the Add button. 4. In the newly created class, a number of using/Imports statements need to be added. Insert the following code at the top of the just added class file:
' VB Imports System.ServiceModel.Dispatcher Imports System.ServiceModel Imports System.Text.RegularExpressions // C# using System.ServiceModel.Dispatcher; using System.ServiceModel; using System.Text.RegularExpressions;
To operate within the WCF pipeline, the newly added class must implement the IParameterInspector interface.
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