creating barcode vb.net Lesson 2: End-to-End Tracing in Visual C#.NET

Print DataMatrix in Visual C#.NET Lesson 2: End-to-End Tracing

Lesson 2: End-to-End Tracing
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' VB Trace.CorrelationManager.ActivityId = originalActivityId // C# Trace.CorrelationManager.ActivityId = originalActivityId;
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5. In Solution Explorer, double-click the HeaderService file in the DemoService project. 6. At the beginning of the GetHeaders method, add the following line of code:
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' VB Trace.WriteLine(Trace.CorrelationManager.ActivityId) // C# Trace.WriteLine(Trace.CorrelationManager.ActivityId);
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The purpose of this just-added line of code isn t to display the activity ID in the service. (There is no user interface to the service, so the WriteLine output would not be visible.) Instead, set a breakpoint on this line. Then when the application is running, the value of ActivityId can be compared to the value on the client to ensure that propagation took place. 7. To propagate the activity, the trace source must be configured appropriately. In Solution Explorer, double-click the App.config file in the DemoService project. 8. Find the source element for System.ServiceModel. In the source tag, add a propagateActivity attribute. The value of the attribute should be set to true . When you are finished, the value of the source element will appear as follows:
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<source name="System.ServiceModel" switchValue="Warning" propagateActivity="true">
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9. The same change is required for the configuration file on the client side. In Solution Explorer, double-click the app.config file in the TestClient project. 10. Find the source element for System.ServiceModel. In the source tag, add a propagateActivity attribute. The value of the attribute should be set to true . When you are finished, the value of the source element will appear as follows:
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<source name="System.ServiceModel" switchValue="Warning" propagateActivity="true">
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11. Ensure that TestClient is set as the startup project, and then launch the application by pressing F5. After a few seconds, you will see a command window appear. At the top, a GUID will be displayed. 12. Note the value (or at least move the window so that it remains visible behind Visual Studio). In another few seconds, the breakpoint that was set in the service will be reached. 13. While at the breakpoint, check the value of the Trace.CorrelationManager.ActivityId property. Notice that it is the same as the GUID that was displayed on the client side. 14. To finish running the application, stop debugging by choosing Stop Debugging from the Debug menu in Visual Studio 2008.
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Instrumentation
Exercise 2
Visualize Activities by Using the Service Trace Viewer
Along with being able to propagate activities, it can be useful to raise events specifically and publish information about a service and client within that client. In this exercise, you create a new activity and label it with an informative value. Then you use the Service Trace Viewer to display the activity details. 1. Navigate to the <InstallHome>/6/Lesson2/Exercise2/<language>/Before directory and double-click the Exercise2.sln file to open the solution in Visual Studio. 2. In Solution Explorer, double-click the Program.cs or Module1.vb file in the TestClient project. As a starting point for this exercise, you must create a new activity named Demo Activity, which will be the containing activity for any other activities you create. There are two steps to creating an activity. The first is to generate a GUID and assign it to the ActivityId property on CorrelationManager. 3. Add the following code to the beginning of the Main method in Program.cs or Module1.vb:
' VB Dim newActivityId As Guid = Guid.NewGuid() Trace.CorrelationManager.ActivityId = newActivityId // C# Guid newActivityId = Guid.NewGuid(); Trace.CorrelationManager.ActivityId = newActivityId;
4. The second step in the process is to emit a TraceEvent, indicating that an activity has started. To do this, add the following the code below the code added in the previous step:
' VB Dim ts As New TraceSource("DemoServiceTraceSource") ts.TraceEvent(TraceEventType.Start, 0, "DemoService Actvitity") // C# TraceSource ts = new TraceSource("DemoServiceTraceSource"); ts.TraceEvent(TraceEventType.Start, 0, "DemoService Actvitity");
Now that that containing activity has been established, the activity context needs to be switched. Do this by creating a new activity ID (that is, a new GUID) and invoking the TraceTransfer method. 5. Add the following code at the beginning of the using block:
' VB Dim originalActivityId As Guid = Trace.CorrelationManager.ActivityId newActivityId = Guid.NewGuid() ts.TraceTransfer(0, "Transfer", newActivityId) // C# Guid originalActivityId = Trace.CorrelationManager.ActivityId; newActivityId = Guid.NewGuid(); ts.TraceTransfer(0, "Transfer", newActivityId);
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