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The benefit of this approach is that you start with a clean slate every time, ensuring that the same tests consistently produce the same results because they re starting with the same baseline environment and not one that continues to change over time due to other testing activities, and you don t contaminate your development or testing site with test data..

To see the implications of defining a partial method, create a new Console Application project named PartialMethods. Now, define a new class named CarLocator within a C# file named CarLocator.cs: // CarLocator.cs partial class CarLocator { // This member will always be part of the // CarLocator class. public bool CarAvailableInZipCode(string zipCode) { // This call *may* be part of this method // implementation. VerifyDuplicates(zipCode); // Assume some interesting database logic // here... return true; } // This member *may* be part of the CarLocator class! partial void VerifyDuplicates(string make); } Notice that the VerifyDuplicates() method has been defined with the partial modifier and does not define a method body within this file. Also notice that the CarAvailableInZipCode() method is making a call to VerifyDuplicates() within its implementation. If you were to compile this application as it now stands and open the compiled assembly in a tool such as ildasm.exe or reflector.exe, you would find no trace of the VerifyDuplicates() method in the CarLocator class, and no trace of the call to VerifyDuplicates() within CarAvailableInZipCode()! With the project as it now stands, you really authored the following definition of the CarLocator class as far as the compiler is concerned:

If var is empty or not set, message will be printed to the standard error, and the script will exit with a status of 1. If message is empty, parameter null or not set will be printed. Listing 5-2 expects two nonnull command-line arguments and uses this expansion to display error messages when they are missing or null. Listing 5-2. checkarg, Exit If Parameters Are Unset or Empty ## Check for unset arguments : ${1 An argument is required} \ ${2 Two arguments are required} ## Check for empty arguments : ${1: A non-empty argument is required} \ ${2: Two non-empty arguments are required} echo "Thank you." The message will be printed by the first expansion that fails, and the script will exit at that point: $ checkarg /home/chris/bin/checkarg: $ checkarg x /home/chris/bin/checkarg: $ checkarg '' '' /home/chris/bin/checkarg: $ checkarg x '' /home/chris/bin/checkarg: $ checkarg x x Thank you. line 10: 1: An argument is required line 10: 2: Two arguments are required line 13: 1: A non-empty argument is required line 13: 2: Two non-empty arguments are required

internal class CarLocator { public bool CarAvailableInZipCode(string zipCode) { return true; } } The reason for this strange stripping away of code has to do with the fact that the partial VerifyDuplicates() method was never given a true implementation. If you were to now add a new file to your project (named perhaps CarLocatorImpl.cs) that defined the remainder of the partial method: // CarLocatorImpl.cs partial class CarLocator { partial void VerifyDuplicates(string make) { // Assume some expensive data validation // takes place here... } } you would find that the full scope of the CarLocator class is taken into account at compile time, as shown in the following approximate C# code: internal class CarLocator { public bool CarAvailableInZipCode(string zipCode) { this.VerifyDuplicates(zipCode); return true; } private void VerifyDuplicates(string make) { } } As you can see, when a method is defined with the partial keyword, the compiler will determine if it should be emitted into the assembly based on whether the method has a method body or is simply an empty signature. If there is no method body, all traces of the method (invocations, metadata descriptions, prototypes) are stripped out during the compilation cycle. In some ways, C# partial methods are a strongly typed version of conditional code compilation (via the #if, #elif, #else, and #endif preprocessor directives). The major difference, however, is that a partial method will be completely ignored during the compilation cycle (regardless of build settings) if there is not a supporting implementation.