creating barcode vb.net Lesson 1: Basic WCF Tracing in Visual C#.NET

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Lesson 1: Basic WCF Tracing
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Configuring the Listeners
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As was mentioned earlier, at least one listener is necessary for trace messages to be persisted into any useful location. As part of the run-time processing, WCF sends the trace messages, using the listeners configured as shown at the end of the previous section. Filtering is performed by using the switchValue attribute, and the defined listeners (of which there can be more than one) process the trace information according to the format and destination of the output. There are two ways to configure listeners. The most direct is simply to provide the details in the listeners section within the sources element of the configuration. The following segment from a configuration file would send the traces generated from the System.ServiceModel namespace, with a level of Information (or more severe) or ActivityTracing to the Traces.svclog file in the C:\log directory:
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<system.diagnostics> <sources> <source name="System.ServiceModel" switchValue="Information, ActivityTracing"> <listeners> <add name="log" type="System.Diagnostics.XmlWriterTraceListener" initializeData="c:\log\Traces.svclog" /> </listeners> </source> </source> </system.diagnostics>
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The add element contains a number of attributes. The name attribute, in this instance, doesn t have any purpose. It can be used to access the listener programmatically, but this functionality is not required for this discussion. The type attribute indicates the class that implements the listener. In this example, the trace information will be formatted into an XML document. The initializeData attribute, in this instance, contains the path to the file the listener will generate. In general, however, the contents and use of the initializeData value depend on the listener. The second way to configure listeners is to define a shared listener. The components are similar, but they are placed into different sections, as illustrated in the following segment from a configuration file:
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<system.diagnostics> <sources> <source name="System.ServiceModel" switchValue="Information, ActivityTracing"> <listeners> <add name="log" /> </listeners> </source> <source name="System.ServiceModel.MessageLoging" switchValue="Critical"> <listeners>
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Instrumentation
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<add name="log" /> </listeners> </source> </sources> <sharedListeners> <add name="log" type="System.Diagnostics.XmlWriterTraceListener" initializeData="c:\log\Traces.svclog" /> </sharedListeners> <trace autoflush="true" /> </system.diagnostics>
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In the source section, two sources are created, each of which will send trace information to a listener with the name of log . In the sharedListeners section, an XmlWriterTraceListener is defined with a name of log . As a result, the XmlWriterTraceListener processes the trace information of the two sources.
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NOTE
Listeners, multithreading, and performance
Not all trace listeners are thread-safe. The XmlWriterTraceListener is not, for example. As part of its processing, the listener may lock resources to ensure integrity. The result, when many threads are accessing the same listener, is the possibility of performance issues stemming from the need to respect exclusive locks.
The second technique for configuring listeners is through code. This requires a couple of steps, albeit fairly simple ones. To start with, an instance of the listener class is created. Each of the listeners that can be defined through the configuration file also has a corresponding class. The difference between these classes is the parameters used in the constructor. Depending on the listener s requirements, different parameters are used. The parameters roughly correspond to the information that would have been included in the initializeData attribute in the configuration file. The following code demonstrates how to instantiate a TextWriterTraceListener:
' VB Dim traceLog As New FileStream("C:\log\Traces.svclog", _ FileMode.OpenOrCreate) Dim myListener As New TextWriterTraceListener(traceLog) // C# FileStream traceLog = new FileStream("C:\\log\\Traces.svclog", FileMode.OpenOrCreate); TextWriterTraceListener myListener = new TextWriterTraceListener(traceLog);
After the instance of the listener object has been created, it should be added to the Listeners collection associated with the Trace class. This is shown in the following code:
' VB Trace.Listeners.Add(myListener) // C# Trace.Listeners.Add(myListener);
Lesson 1: Basic WCF Tracing
After the listener is created, you actually have two methods you can use to send messages to it. Naturally, the write methods associated with the Trace class (Write, WriteLine, WriteIf, WriteLineIf, and so on) will work (assuming that the listener is associated with the source specified in the parameter list). However, you can also call the Write, WriteIndent, and WriteLine methods that are exposed on the listener, as shown here:
' VB myListener.WriteLine("Sending trace information") // C# myListener.WriteLine("Sending trace information");
Unlike the Trace write methods, when you use the write methods on the listener, the output will be directed to that listener only. Also, it might be necessary to manually flush the output sent directly to the listener. If you call the Flush static/shared method on the Trace class, all the trace messages in all the listeners are flushed to their respective persistence mechanism. However, if you use the listener Write methods and that listener is not included in the Trace.Listeners collection, calling Trace.Flush will have no effect. Instead, you must flush the listener explicitly, as shown here:
' VB Trace.Flush() myListener.Flush() // C# Trace.Flush(); myListener.Flush();
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