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As mentioned previously, DCOM quickly became a legacy distributed API after the release of the .NET platform. In its place, the .NET base class libraries shipped with the .NET remoting layer, represented by the System.Runtime.Remoting namespace. This API allows multiple computers to distribute objects, provided they all run the applications under the .NET platform. The .NET remoting APIs provided a number of useful features. Most important was the use of XMLbased configuration files to define declaratively the underlying plumbing used by the client and the server software. Using *.config files, it was easy to alter the functionality of your distributed system radically simply by changing the content of the configuration files and restarting the application. Also, given that only .NET applications can use this API is usable, you can gain various performance benefits because data can be encoded in a compact binary format, and you can use the Common Type System (CTS) when defining parameters and return values. While it is possible to use.NET remoting to build distributed systems that span multiple operating systems (using Mono, which was briefly mentioned in 1 and detailed in Appendix B), interoperability between other programming architectures (e.g., Java) was still not directly possible.

On a final note, be aware that the use of the .NET string formatting characters is not limited to console programs. This same formatting syntax can be used when calling the static string.Format() method. This can be helpful when you need to compose textual data at runtime for use in any application type (e.g., desktop GUI app, ASP.NET web app, XML web services). For example, assume you are building a graphical Windows Forms desktop application and need to format a string for display in a message box. static void DisplayMessage() {

'#maxlength' => 7, ); break; case 'color_example_3text': // Convert rgb value into r, g, and b for #default_value. if (isset($items[$delta]['rgb'])) { preg_match_all('@..@', substr($items[$delta]['rgb'], 1), $match); } else { $match = array(array()); } // A fieldset to hold the three text fields. $element += array( '#type' => 'fieldset', '#element_validate' => array('color_example_3text_validate'), // The following is set so that the validation function will be able // to access external value information that otherwise would be // unavailable. '#delta' => $delta, '#attached' => array( 'css' => array(drupal_get_path('module', 'color_example') . '/color_example.css'), ), ); // Create a textfield for saturation values for Red, Green, and Blue. foreach (array('r' => t('Red'), 'g' => t('Green'), 'b' => t('Blue')) as $key => $title) { $element[$key] = array( '#type' => 'textfield', '#title' => $title, '#size' => 2, '#default_value' => array_shift($match[0]), '#attributes' => array('class' => array('rgb-entry')), // '#description' => t('The 2-digit hexadecimal representation of the @color saturation, like "a1" or "ff"', array('@color' => $title)), ); } break; } return $element;

// Using string.Format() to format a string literal. string userMessage = string.Format("100000 in hex is {0:x}", 100000); // You would need to reference System.Windows.Forms.dll // in order to compile this line of code! System.Windows.Forms.MessageBox.Show(userMessage); } Notice how string.Format() returns a new string object, which is formatted according to the provided flags. After this point, you are free to use the textual data as you see fit.

Like any programming language, C# defines an intrinsic set of fundamental data types, which are used to represent local variables, member variables, return values, and parameters. Unlike other programming languages, however, these keywords are much more than simple compiler-recognized tokens. Rather, the C# data type keywords are actually shorthand notations for full-blown types in the System namespace. Table 3-4 lists each system data type, its range, the corresponding C# keyword, and the type s compliance with the common language specification (CLS).

The next function defines the validations that will be performed against the data entered by the user. /** * Validate the individual fields and then convert them into a single HTML RGB * value as text.

Note Recall from 1 that CLS-compliant .NET code can be used by any managed programming language. If you expose non CLS-compliant data from your programs, other languages may not be able to make use of it.

Table 3-4. The Intrinsic Data Types of C#

true or false 128 to 127 0 to 255 32,768 to 32,767 0 to 65,535 2,147,483,648 to 2,147,483,647 0 to 4,294,967,295

*/ function color_example_3text_validate($element, &$form_state) { $delta = $element['#delta']; $field = $form_state['field'][$element['#field_name']][$element['#language']]['field']; $field_name = $field['field_name']; if (isset($form_state['values'][$field_name][$element['#language']][$delta])) { $values = $form_state['values'][$field_name][$element['#language']][$delta]; foreach (array('r', 'g', 'b') as $colorfield) { $val = hexdec($values[$colorfield]); // If they left any empty, we'll set the value empty and quit. if (strlen($values[$colorfield]) == 0) { form_set_value($element, array('rgb' => NULL), $form_state); return; } // If they gave us anything that's not hex, reject it. if ( (strlen($values[$colorfield]) != 2) || $val < 0 || $val > 255) { form_error($element[$colorfield], t("Saturation value must be a 2-digit hexadecimal value between 00 and ff.")); } } $value = sprintf('#%02s%02s%02s', $values['r'], $values['g'], $values['b']); form_set_value($element, array('rgb' => $value), $form_state);