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PART II
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The Debug Class
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Let s step up a simple example of creating debugging statements within your program code Take a look at the code listing in Figure 9-9 We have added debugging code to the beginning of the program The first thing done (in lines 11 and 12) is that the output of the Debug statement is redirected to the console window By default, it will appear in
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Figure 9-9
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Adding debugging code to your program
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the output windows, which may not help you as you execute the program You could decide to redirect this output to a debug file, as well, by following the same practice From this point on, you can use the DebugWriteLine statement to output any debugging information you wish The output of this program is shown in the next illustration
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There are two ways of enabling the debugging (other than those previously mentioned within Visual Studio NET) you can add the DEBUG directive (as shown at the top of the code in Figure 9-9) or you can enable it through the command line with this command:
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csc /d:DEBUG BuggyAppcs
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The Debug class has several methods and properties available for use: Assert() Checks for a specified condition and then displays a dialog box if false (see Figure 9-10) Write() Writes the debugging information to the trace listeners (which can redirect the default console output) without causing a carriage return WriteIf() Checks for a true condition before writing the debugging information WriteLine() Does the same thing as Write(), except it causes a carriage return after writing WriteLineIf() Does the same thing as WriteIf(), except it causes a carriage return after writing Figure 9-10 demonstrates a very simplistic example of using Assert() and WriteIf() Notice the output from the program in Figure 9-11
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9: Debugging and Testing
PART II
Figure 9-10
Using the Debug class
To enable debugging for ASPNET, follow these steps: For a single page, add <@ Page Debug = "true"%> For an application, add the following to webConfig:
<configuration> <systemweb> <compilation debug="true" /> </systemweb> </configuration
Implementing Tracing
Tracing can provide valuable feedback on a running, live application It allows you to enable diagnostic tracing that has low overhead for the executing program You will see in the next few sections how you can add trace switches to the application and thereby control the level of tracing You will also see how to add trace listeners to the program to control the destination output of the message
Figure 9-11
Output from the program in Figure 9-10
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Imagine the power of creating an environment that reports on its progress, its errors, and its warnings It s easy to think of Windows applications that do just this If you look into the Event Log of Windows 2000, you will see a lot of valuable program and service information By implementing tracing, you are providing this same functionality for your application In a large, multi-tier application, this information could be critical to the system analyst If you examine the NET documentation, you will find that the members of the Trace class are identical to the Debug class Microsoft intends that you use the Debug class during your debug builds and the Trace class for all builds EXAM TIP Remember that Debug code will not be added to anything except debug builds Therefore, your execution code will be free of Debug statements Trace code, on the other hand, is intended for runtime execution code, so, by default, tracing is enabled within the Visual Studio NET development environment To enable it otherwise, you add #define TRACE to your code or add the /d: trace switch to the command-line compile TIP You want to ensure that good tracing code is added to a production application By using trace switches, you control how much actual tracing is done In the past, tracing caused a lot of output overhead Consider the example of an application with tracing enabled that outputs to a trace log file every time a particular field is accessed The output file could become enormous, depending on the usage By ensuring that you follow good tracing practices, as defined in the next section, and that you employ trace switches carefully, you will provide administration with valuable output information about your application Adding Trace Switches As we have mentioned, tracing can cause an exorbitant amount of output if not controlled properly As a result, Microsoft developed a TraceSwitch class in the SystemDiagnostics namespace to let you dynamically set the level of tracing There are five tracing levels: 0 1 2 3 4 None Errors only Warnings as well as errors Information messages (and warnings and errors) Verbose as its name suggests, everything
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