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myTable.Columns.Add(new DataColumn("FirstName")); myTable.Columns.Add(new DataColumn("LastName")); myTable.Columns.Add(new DataColumn("Age")); // Now add a row to the table. myTable.Rows.Add("Mel", "Appleby", 60); // Use multi-dimension indexer to get details of first row. Console.WriteLine("First Name: {0}", myTable.Rows[0][0]); Console.WriteLine("Last Name: {0}", myTable.Rows[0][1]); Console.WriteLine("Age : {0}", myTable.Rows[0][2]); } Do be aware that we ll take a rather deep dive into ADO.NET beginning with 21, so if some of the previous code seems unfamiliar, fear not. The main point of this example is that indexer methods can support multiple dimensions, and if used correctly, can simplify the way you interact with contained subobjects in custom collections.

Indexers can be defined on a given .NET interface type to allow supporting types to provide a custom implementation. Here is a simple example of an interface that defines a protocol for obtaining string objects using a numerical indexer: public interface IStringContainer { // This interface defines an indexer that returns // strings based on a numerical index. string this[int index] { get; set; } } With this interface definition, any class or structure that implements this interface must now support a read/write indexer that manipulates subitems using a numerical value. That wraps up the first major topic of this chapter. While understanding the syntax of C# indexers is important, as explained in 10, typically the only time a programmer needs to build a custom generic collection class is to add constraints to the type parameters. If you happen to build such a class, adding a custom indexer will make your collection class look and feel like the standard collection classes in the .NET base class libraries. Now let s examine a language feature that lets you build custom classes or structures that respond uniquely to the intrinsic operators of C#. Allow me to introduce operator overloading.

This file executes hook_form_formname_alter and in the example here sets the site name field on the form to the site name defined by the server. You can start with a blank .profile file and add to it as necessary to support your requirements; however, nothing is required and a blank .profile file is all that is required. /** * Implements hook_form_alter(). * * Allows the profile to alter the site configuration form. */ function enhanced_form_install_configure_form_alter(&$form, $form_state, $form_id) { if ($form_id == 'install_configure_form') { // Set default for site name field. $form['site_information']['site_name']['#default_value'] = $_SERVER['SERVER_NAME']; } }

C#, like any programming language, has a canned set of tokens that are used to perform basic operations on intrinsic types. For example, you know that the + operator can be applied to two integers in order to yield a larger integer: // The + operator with ints. int a = 100;

int b = 240; int c = a + b;

This is the file where all the features, functions, variables, and configuration options are defined and set. In the .install file, I ll define the following: The input formats that will be defined and enabled The blocks that will be enabled and assigned to regions The content types that will be created and enabled The fields that will be created and associated with content types The permissions that will be assigned to the site administrators

Once again, this is no major newsflash, but have you ever stopped and noticed how the same + operator can be applied to most intrinsic C# data types For example, consider this code: // + operator with strings. string s1 = "Hello"; string s2 = " world!"; string s3 = s1 + s2; // s3 is now "Hello world!" In essence, the + operator functions in specific ways based on the supplied data types (strings or integers in this case). When the + operator is applied to numerical types, the result is the summation of the operands. However, when the + operator is applied to string types, the result is string concatenation. The C# language gives you the capability to build custom classes and structures that also respond uniquely to the same set of basic tokens (such as the + operator). Be aware that you cannot overload every intrinsic C# operator. Table 12-1 outlines the overloadability of the core operators. Table 12-1. Overloadability of C# Operators