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When writing applications that verify the values of parameters, the resulting code can become large and hard to maintain. To compact the verification code, a potential solution is to use the Assert class. The Assert class doesn t exist in the .NET class library in the sense of performing a verification of a test and then generating an exception. You ll need to write your own, use the Assert class from the NUnit library, or use the Verification class that s available at the web site http://www.devspace.com/Wikka/wikka.php wakka=BookReLearningOOPUsingNetPatterns. For illustration purposes, I ll demonstrate the Verification class, but the Assert class in NUnit functions in a similar manner. Regardless of which assertion library you use, assertions all function similarly. The idea behind an assertion library is to provide a framework in which you can use a method to test a value s validity or invalidity. If the test fails, then the assertion framework will execute some routines to deal with the inconsistency. Assertions are most often used to validate parameters before they re processed. The following simple assertion tests for a positive integer: Verification.IsTrue( param1 > 0, new InstantiateException( AssertionFailure.Instantiate)); The class Verification has a method IsTrue, which has two parameters. The first parameter is the test that must be true. The test param1 must be greater than zero and must return a true value. The second parameter is a delegate that s used to instantiate an exception when necessary. Had a delegate not been used, then whenever the IsTrue method is called, the exception would be instantiated, but not thrown. The downside to the instantiation is that an automatic log file entry would be created, and that isn t desired. You define the class AssertionFailure as follows:

If an integer does not fill up three spaces, it is padded with one or two space characters so that the IP address will always have a width of fifteen characters This allows us to know exactly where the cursor should be placed at all times, since the width is guaranteed..

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The .NET Framework provides two types of container classes: the nongeneric container classes that hold references to Object and the generic collection classes. The so-called weakly typed collections were made available in the 1.0 version of the .NET Framework, and are still available in later versions. The generic collections became available in .NET Framework 2.0 with Visual Studio 2005. The generic collections are strongly typed, meaning that the objects in the collection are restricted to a specific type, and compilers will detect any attempt to insert the incorrect type into the container. In a weakly typed collection class, it is the responsibility of the user to ensure that objects inserted into the collection are of the appropriate type. Usually, objects are cast dynamically back to the appropriate type when they are retrieved from the collection. If objects of the wrong type are inserted, they will produce a runtime InvalidCastException when retrieved.

The MyIPAddress widget is built so that the cursor is forced to one of four positions. Each number is always aligned to the right and padded with spaces on the left if necessary. Because of this, the cursor is forced into the position on the right of one of the four numbers. This is done in the notify::cursor-position callback function displayed in Listing 11-12. Listing 11-12. Callback Functions for MyIPAddress /* Force the cursor to always be at the end of one of the four numbers. */ static void my_ip_address_move_cursor (GObject *entry, GParamSpec *spec) { gint cursor = gtk_editable_get_position (GTK_EDITABLE (entry)); if (cursor <= 3) gtk_editable_set_position else if (cursor <= 7) gtk_editable_set_position else if (cursor <= 11) gtk_editable_set_position else gtk_editable_set_position } /* Handle key presses of numbers, tabs, backspaces and returns. */ static gboolean my_ip_address_key_pressed (GtkEntry *entry, GdkEventKey *event) { MyIPAddressPrivate *priv = MY_IP_ADDRESS_GET_PRIVATE (entry); guint k = event->keyval; gint cursor, value; /* If the key is an integer, append the new number to the address. This is only * done if the resulting number will be less than 255. */ if ((k >= GDK_0 && k <= GDK_9) || (k >= GDK_KP_0 && k <= GDK_KP_9)) { cursor = floor (gtk_editable_get_position (GTK_EDITABLE (entry)) / 4); value = g_ascii_digit_value (event->string[0]); if ((priv->address[cursor] == 25) && (value > 5)) return TRUE;

class AssertionFailure : ApplicationFatalException { public AssertionFailure( string message) : base( message) { } public static Exception Instantiate() { return new AssertionFailure( "Could not assert"); } } The class AssertionFailure subclasses the class ApplicationFatalException. You use the static method Instantiate to create a new instance of the class AssertionFailure. Many assertion libraries, including the referenced Assert class, have additional methods such as IsNull, AreSame, Fail, and so on, which you can use to test and generate exceptions in different contexts.

(GTK_EDITABLE (entry), 3); (GTK_EDITABLE (entry), 7); (GTK_EDITABLE (entry), 11); (GTK_EDITABLE (entry), 15);

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