c# wpf print barcode Lesson 2: End-to-End Tracing in Visual C#.NET

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Lesson 2: End-to-End Tracing
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After the transfer has occurred, the ActivityId should be updated with the new GUID and the activity started. 6. Add the following code below the just-added lines:
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' VB Trace.CorrelationManager.ActivityId = newActivityId ts.TraceEvent(TraceEventType.Start, 0, "GetHeader Activity") // C# Trace.CorrelationManager.ActivityId = newActivityId; ts.TraceEvent(TraceEventType.Start, 0, "GetHeader Activity");
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To include some informational messages in the trace log, surround the call to the service with a couple of statements that generate informational data, using the TraceEvent method. 7. At the current bottom of the using block, a Console.WriteLine statement invokes the service. Replace that line with the following lines:
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' VB ts.TraceEvent(TraceEventType.Information, 0, _ "Client sending message to DemoService") Console.WriteLine("And the headers are: " & proxy.GetHeaders()) ts.TraceEvent(TraceEventType.Information, 0, _ "Client received response from DemoService") // C# ts.TraceEvent(TraceEventType.Information, 0, "Client sending message to DemoService"); Console.WriteLine("And the headers are: " + proxy.GetHeaders()); ts.TraceEvent(TraceEventType.Information, 0, "Client received response from DemoService");
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Now that the GetHeaders activity is complete, the activity needs to be transferred back to the original activity and a Stop event generated. 8. Add the following code to the end of the using block:
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' VB ts.TraceTransfer(667, "Transfer to DemoService Actitity", _ originalActivityId) ts.TraceEvent(TraceEventType.Stop, 0, "GetHeader Activity") Trace.CorrelationManager.ActivityId = originalActivityId // C# ts.TraceTransfer(667, "Transfer to DemoService Actitity", originalActivityId); ts.TraceEvent(TraceEventType.Stop, 0, "GetHeader Activity"); Trace.CorrelationManager.ActivityId = originalActivityId;
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Finally, the containing activity (the one called DemoService Activity) needs to be stopped.
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Instrumentation
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9. Add the following line of code outside the using block but above the Console.ReadLine statement:
' VB ts.TraceEvent(TraceEventType.Stop, 0, "DemoService Activity") // C# ts.TraceEvent(TraceEventType.Stop, 0, "DemoService Activity");
At this point, the client portion of the application has been instrumented. Now it s time to instrument the service. 10. In Solution Explorer, double-click the HeaderService file. If the service is going to work with the activity, it shouldn t start by assuming that one has been provided by the client. As you saw in Exercise 1, Instrument a WCF Application for End-to-End Tracing, some configuration needs to be done to propagate the ActivityId between the client and the service. 11. The following code should be added to the beginning of the GetHeaders method to ensure that an activity ID is available for use:
' VB If Trace.CorrelationManager.ActivityId = Guid.Empty Then Trace.CorrelationManager.ActivityId = Guid.NewGuid() End If // C# if (Trace.CorrelationManager.ActivityId == Guid.Empty) Trace.CorrelationManager.ActivityId = Guid.NewGuid();
12. Within the method, you need to start an activity by using the TraceEvent method. Add the following code below the just-added lines:
' VB Dim ts As New TraceSource("DemoServiceTraceSource") ts.TraceEvent(TraceEventType.Start, 0, "GetHeader Activity") // C# TraceSource ts = new TraceSource("DemoServiceTraceSource"); ts.TraceEvent(TraceEventType.Start, 0, "GetHeader Activity");
As you did with the client, an information message will be emitted into the trace log before and after the actual processing done by the method. 13. To start, add the following line of code below the just-added lines:
' VB ts.TraceEvent(TraceEventType.Information, 0, _ "Service receives GetHeader request message.") // C# ts.TraceEvent(TraceEventType.Information, 0, "Service receives GetHeader request message.");
Lesson 2: End-to-End Tracing
14. Also add the following code just prior to the return statement at the bottom of the method. It provides the second piece of informational data to the trace log:
' VB ts.TraceEvent(TraceEventType.Information, 0, _ "Service sends GetHeaders response message.") // C# ts.TraceEvent(TraceEventType.Information, 0, "Service sends GetHeaders response message.");
Finally, for the service code, you must stop the activity that was started at the beginning of the method. 15. Add the following code after the just-added lines and before the return statement:
' VB ts.TraceEvent(TraceEventType.Stop, 0, "GetHeader Activity") // C# ts.TraceEvent(TraceEventType.Stop, 0, "GetHeader Activity");
Even though you have instrumented the service and client, you still need to make a couple of configuration changes. Specifically, you need to configure the trace source that was created in both client and server (named DemoServiceTraceSource) to capture both Information and ActivityTracing traces. 16. In Solution Explorer, double-click the App.config file for the DemoService project. 17. Add the following configuration information for the DemoServiceTraceSource to the sources element:
<source name="DemoServiceTraceSource" switchValue="Information,ActivityTracing"> <listeners> <add name="log"/> </listeners> </source>
18. The same block of configuration XML needs to be defined on the client side as well. In Solution Explorer, double-click the app.config file for the TestClient project. 19. Insert the following configuration XML into the sources element of the file:
<source name="DemoServiceTraceSource" switchValue="Information,ActivityTracing"> <listeners> <add name="log"/> </listeners> </source>
20. Ensure that the TestClient project is set as the startup project and launch the application by pressing F5. In a couple of seconds, the Console window will display a message, indicating that the header has been received.
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