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It is fine for a non-generic class or structure to support a handful of generic members (e.g., methods and properties). In these cases, you would also need to specify the placeholder value at the time you invoke the method. For example, System.Array supports a several generic methods (which were added in .NET 2.0). Specifically, the static Sort() method now has a generic counterpart named Sort<T>(). Consider the following code snippet, where T is of type int: int[] myInts = { 10, 4, 2, 33, 93 }; // Specify the placeholder to the generic // Sort<>() method. Array.Sort<int>(myInts); foreach (int i in myInts) { Console.WriteLine(i); }

nodes will show up. Plus, node titles are user-submitted data, so they need to be sanitized before output. But as the code currently stands, it just gets the titles from the database and displays them. Let s fix these problems. function insecure_code($type = 'article') { $types = node_type_get_types(); if (!isset($types[$type])) { watchdog('security', 'Possible SQL injection attempt!', array(), WATCHDOG_ALERT); return t('Unable to process request.'); } $output = "Searching for nodes of type: $type <br/>"; $query = db_select('node', 'n'); $query->fields('n', array('title')); $query->condition("n.type", $type); $query->condition("n.status", 1); $result = $query->execute(); $items = array(); foreach($result as $row) { $items[] = check_plain($row->title); } if (sizeof($items) > 0) { $output .= theme('item_list', array('items' => $items)); } else { $output .= "No nodes were found of type $type"; } return $output;

It is common to implement generic interfaces when you building classes or structures that need to support various framework behaviors (e.g., cloning, sorting, and enumeration). In 9, you learned about a number of non-generic interfaces, such as IComparable, IEnumerable, IEnumerator, and IComparer. Recall that the non-generic IComparable interface was defined like this: public interface IComparable { int CompareTo(object obj); } In 9, you also implemented this interface on your Car class to enable sorting in a standard array. However, the code required a several runtime checks and casting operations because the parameter was a general System.Object:

public class Car : IComparable { ... // IComparable implementation. int IComparable.CompareTo(object obj) { Car temp = obj as Car; if (temp != null) { if (this.CarID > temp.CarID) return 1; if (this.CarID < temp.CarID) return -1; else return 0; } else throw new ArgumentException("Parameter is not a Car!"); } } Now assume you use the generic counterpart of this interface: public interface IComparable<T> { int CompareTo(T obj); } In this case, your implementation code will be cleaned up considerably: public class Car : IComparable<Car> { ... // IComparable<T> implementation. int IComparable<Car>.CompareTo(Car obj) { if (this.CarID > obj.CarID) return 1; if (this.CarID < obj.CarID) return -1; else return 0; } } Here you do not need to check whether the incoming parameter is a Car because it can only be a Car! If someone were to pass in an incompatible data type, you would get a compile-time error. Now that you have a better handle on how to interact with generic items, as well as the role of type parameters (aka placeholders), you re ready to examine the classes and interfaces of the System.Collections.Generic namespace.

Now only unpublished nodes will show up, and all the titles are run through check_plain() before being displayed. We ve also removed the debugging code. This module has come a long way! But there s still a security flaw. Can you see it If not, read on.

You can find the bulk of the System.Collections.Generic namespace in the mscorlib.dll and System.dll assemblies. At the opening of this chapter, I briefly mentioned some of the core non-generic interfaces implemented by the non-generic collection classes. Not too surprisingly, the System.Collections.Generic namespace defines generic replacements for many of them. In fact, you can find a number of the generic interfaces that extend their non-generic counterparts! This might seem odd; however, by doing so, implementing classes will also support the legacy functionally found in their non-generic siblings. For example, IEnumerable<T> extends IEnumerable. Table 10-3 documents the core generic interfaces you ll encounter when working with the generic collection classes.