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Instrumentation
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classes are provided by default: Trace and Debug. They are used almost identically, and the only substantive difference is within their physical implementation. Trace is implemented in both Release and Debug builds, whereas Debug is implemented only in Debug builds. Because we ve discussed the Debug class in depth already, we ll now focus on the Trace class.
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The Trace Class
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Like the Debug class, the Trace class is mainly useful when a listener object is attached to it. Visual Studio 2005 has many listener objects built in, including XmlTraceListener, DefaultTraceListener, DelimmedListTraceListener, and EventLogTraceListener. A list of the most useful methods is provided in Table 10-4.
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Table 10-4
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Methods of the Trace Class
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Name AutoFlush Close Fail Flush Indent IndentLevel IndentSize Listeners Refresh TraceInformation TraceWarning Unindent
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Description Gets or sets whether output will be automatically flushed after every write operation Flushes the output buffer, and closes all associated listener objects Emits an error message with the information you specify Flushes the output buffer, and writes the output to all attached listener objects Increments the current IndentLevel of trace output Gets or sets the IndentLevel Gets or sets the number of spaces in an Indent Gets the collection of listeners that are monitoring trace output Refreshes the trace information Writes an information message to all associated Trace class listener objects Writes a warning message to all associated Trace class listener objects Decrements the IndentLevel
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Lesson 2: Debugging and Tracing
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Table 10-4 Methods of the Trace Class
Name UseGlobalLock Write WriteIf WriteLine WriteLineIf
Description Gets whether a GlobalLock should be issued, and sets one if necessary Writes information about attached Debug or Trace class Listener objects in the Listeners collection Performs the same actions as the Write method, but does so only if a specified condition is met Writes information about attached Debug or Trace class Listener objects in the Listeners collection Performs the same actions as the WriteLine method, but does so only if a specified condition is met
Because these methods are identical to those discussed in the earlier section about the Debug class or they are self explanatory, let s move on.
The TraceSource Class
The TraceSource class provides a mechanism that enables the tracing of code execution as well as associating trace messages with their source. To use TraceSource, do the following: 1. Declare an instance of a TraceSource class. 2. Name the TraceSource. 3. Call the respective methods on it. The following code demonstrates the use of TraceSource:
' VB Dim DemoTrace As New TraceSource("DemoApp") DemoTrace.TraceInformation("This is a Test") // C# TraceSource DemoTrace = new TraceSource("DemoApp"); DemoTrace.TraceInformation("This is a test");
The TraceSwitch Class
The TraceSwitch class is used to dynamically alter behavior of the Trace class. For instance, you can alter the behavior for the Trace class to log the TraceError, TraceWarning, or TraceInfo properties. You can also specify, for example, that the log use verbose
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Instrumentation
mode, in which everything is logged. This class provides all the functionality developers need to finely tailor tracing. Tracing can be turned on and off, for example. The levels can be changed. And as with most every other object in the System.Diagnostics namespace, switch objects can be manipulated by using code or a configuration file:
<configuration> <system.diagnostics> <switches> <add name="DemoApp" value="2" /> </switches> </system.diagnostics> </configuration> ' VB Dim DemoTrace As New TraceSource("DemoApp") DemoTrace.Switch.ShouldTrace(TraceEventType.Information) DemoTrace.Switch.Level = SourceLevels.Information DemoTrace.TraceInformation("This is a Test") // C# TraceSource DemoTrace = new TraceSource("DemoApp"); DemoTrace.Switch.ShouldTrace(TraceEventType.Information); DemoTrace.Switch.Level = SourceLevels.Information; DemoTrace.TraceInformation("This is a test");
Listener Objects
To be of value, the Debug and Trace classes depend on listener objects because, stated simply, output is valuable only if it can be analyzed. By default, Visual Studio attaches a listener object that, when written to, directs output to the Output window. The Trace and Debug classes both have a Listeners collection, which includes all the attached listener objects. One or more listener objects can be added to either object and often are.
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