Performance Tips in .NET

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Performance Tips
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Throwing exceptions adds overhead to your applications, so you should throw excep tions as sparingly as possible. For example, you should never use exceptions as a mechanism to return special values from a method, and you should reserve them for truly rare cases. Most methods in the .NET runtime adhere to this practice. For exam ple, the Math.Log and Math.Sqrt methods return the special NaN (Not-a-Number) value when you pass them a negative number. When authoring your own classes, you can provide clients with a read-only property that lets them understand whether a call to a method would result in an exception being thrown. For example, expose an EOF property that returns True when you re at the end of a data file or a bit-coded State property that tells what operations are allowed on the object. (This is the pattern used by the ADO.NET connection object.) Here s another performance tip that has to do with exceptions. By default, Visual Basic checks the overflow flag after each operation on integers so that it can throw an excep tion if the result is outside the valid range. If you re sure that this can t happen in your application, you can improve its performance by selecting the Remove Integer Overflow Checks check box on the Optimizations page of the project Property Pages dialog box. In my informal benchmarks, I saw that operations on Integer variables run about 20 percent faster and operations on Long variables run up to 40 percent faster when this option is enabled.
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The Trace and Debug Classes
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Visual Studio .NET s integrated debugging features are powerful enough for finding and fixing most bugs and logic errors, but in some cases you need to add tracing statements to your code that let you understand why the application is misbehaving. This is especially useful when the problems occur only in compiled applications already deployed at your customer s site. Fortunately, the .NET Framework offers a couple of classes that simplify this task, the Debug and Trace classes, both of which reside in the System.Diagnostics namespace. This namespace is imported at the project level by all Visual Basic projects, so you don t need to specify the complete class names in your code.
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Part I:
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The Basics
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The Debug and Trace classes expose methods for sending a message to the Output window in Visual Studio or to another output device. All these methods are shared methods, which means that you don t need to instantiate an instance of these classes to use them. (You will learn more about shared methods in 4.) For example, both these statements display a string in the Output window in Visual Studio:
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Debug.WriteLine( Program has started ) Trace.WriteLine( Program has started )
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The Write method works similarly except that it doesn t append a newline character:
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Debug.Write( These two strings ) Debug.WriteLine( appear on the same line. )
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The Debug and Trace classes are identical and expose the same methods. The only dif ference between them is that calls to methods of the Debug class are included in the compiled application only if the DEBUG compilation constant is defined, whereas calls to methods of the Trace class are included only if the TRACE compilation constant is defined. By default, the Debug project configuration defines both these compilation constants, while the Release project configuration defines only the TRACE constant. Thus, output from the Trace class is included in all compiled applications, whereas output from the Debug class is discarded in applications compiled in Release mode. So you can include or exclude Debug messages simply by making a different solution configuration active. See Figure 3-4.
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