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10
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Instrumentation
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Lesson 2: Debugging and Tracing
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If, throughout the day, you were to stop by the desks of application developers I work with, you probably wouldn t see them writing code. Most of the time, you d see them debugging their code and stepping through it. Debugging is absolutely critical to developing quality code, and being proficient at it can help developers be more productive and write higher quality code.
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After this lesson, you will be able to:
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Write output. Debug attributes. Create trace listeners. Configure listeners.
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Estimated lesson time: 20 minutes
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Writing Output
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As mentioned earlier, an important part of a developer s job is stepping through code and tracking bugs. Learning how to effectively use the tools available for this task is critical for many reasons. Effective use of these tools includes performing the following tasks:
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Verify that your code is doing what you expect it to. Use the Debug and Debugger classes so that your code can provide feedback to confirm that it is or is not working as planned. You use these classes because stepping through code in other ways is time consuming. Use tools that help to track down bugs after your application has been deployed.
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The two foundational classes used for debugging, Debugger and Debug, are both in the System.Diagnostics namespace.
The Debugger Class
The Debugger class, which enables communication with a debugger application, is fairly straightforward. Although it has multiple members, a few in particular are of primary concern to developers. Those methods are listed in Table 10-1.
Lesson 2: Debugging and Tracing
Table 10-1 Methods of the Debugger Class
Name Break IsAttached IsLogging Launch Log
Description Signals a break to the debugger. This is an excellent tool for conditionally stopping the execution of the application. Indicates whether the debugger is attached to a process already. Indicates whether the Debugger is currently logging. Launches a debugger, and attaches it to a process. Posts a message to the current debugger.
The Break method provides the equivalent of setting a breakpoint manually, but it allows you to do it conditionally and through code. Assume that you have a method named ReturnMessage that returns a String value. Assume further that a return value of null or nothing signals a problem for which you want to stop processing and break into the debugger. Your choice is to set a breakpoint manually or use the Break method. The two methods are functionally equivalent. The following code illustrates how to use the Break method. We assume that the method ReturnMessage() has been declared previously:
' VB Dim MyMessage As String = ReturnMessage() If MyMessage Is Nothing Then Debugger.Break() End If // C# String MyMessage = ReturnMessage(); if (MyMessage == null) { Debugger.Break(); }
This use of the Break method could yield results similar to those shown in the C# implementation in Figure 10-4. Another important feature of the Debugger class is the Log method. Stated simply, the Log method posts information to the attached Debugger if one is present. If no Debugger is present, the result is effectively nothing.
10
Instrumentation
Figure 10-4 method
Breaking into the CLR/Visual Studio .NET 2005 debugger via the Debugger.Break
NOTE Build vs. Release build
For the Debugger or Debug class to function, the build must be performed in Debug mode. If the build is done in any other mode, such as Release, the .NET runtime will effectively ignore any Debug or Debugger statements.
When you use the Log method, it directs the output to whatever listener objects are attached to the debugger. Listener objects will be discussed shortly, but for now it s only pertinent to understand that the Log method directs the output to a listener. To use the Log method, all you need to do is call it and indicate a level, category, and message. We ll begin with a simple listener, DefaultTraceListener. This listener, when attached, will take any Log methods and write them as text to the specified target. To keep things simple, we ll use the Output window as the specified target. To use this method, add a listener object and call the Log method. The following code illustrates this process:
' VB Trace.Listeners.Clear() Dim MyListener As New DefaultTraceListener Trace.Listeners.Add(MyListener) Debugger.Log(1, "Test", "This is a test") Console.ReadLine() // C# Trace.Listeners.Clear(); DefaultTraceListener MyListener = new DefaultTraceListener(); Trace.Listeners.Add(MyListener); Debugger.Log(2, "Test", "This is a test"); Console.ReadLine();
All that we ve done is cleared any existing Listeners from the Listeners collection, added a DefaultTraceListener object, and then sent some output to it. There are multiple
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