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That s it. Just one line of code in the method body! At run time, when the DLR Expression interpreter/compiler sees an instance of PrintExpression, it knows that the expression is reducible. So it calls the Reduce method on the expression and gets back a MethodCallExpression instance. The code snippet above is good, but we can make it slightly better. If you recall, DLR Expression provides factory methods for creating expressions. Our code snippet above is a factory method for creating instances of PrintExpression. To make our factory method look more aligned with the DLR s factory methods, let s rename the class name ExpressionHelper to ExpressionEx. Let s also change the return type of the Print method from Expression to PrintExpression. After those changes, our code becomes: public partial class ExpressionEx { public static PrintExpression Print(String text) { return new PrintExpression(text); } } IronPython makes a lot of use of expression reduction. If you take a look at the IronPython source code in the IronPython.Compiler.Ast namespace, you ll see classes like ForStatement, ImportStatement, ScopeStatement, NameExpression and many others. Those classes all derive directly or indirectly from System.Linq.Expressions.Expression and implement their specific reduction logic in the Reduce method.

You might want to make your own customized policy modifications. Creating a custom security template affords you an easy way to package, deploy, and apply these modifications with a minimum of administrative headache. To create your own security template, follow these steps: 1. In the Security Templates console, expand Security Templates in the tree pane on the left, and right-click the default directory location. 2. Then, select New Template from the context menu that appears. 3. Now you can make any policy modifications you want in any one of the policy areas supported by the tool: account policies, local policies, the event log, restricted groups, system services, the registry, and the file system. Your additions, deletions, and other changes are saved in the template immediately.

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When we write the jQuery code, we ll make sure that the AJAX call from jQuery will pass along a parameter called js and will use the POST method If the js parameter isn t there, we ll know that the user clicked the Vote link and the browser itself is requesting the path for example, plusone/vote/3 In that case, we don t return JSON, because the browser is expecting a regular HTML page Instead, we update the vote total to reflect the fact that the user voted, and then we redirect the browser back to the original page, which will be rebuilt by Drupal and will show the new vote total.

We called plusone_get_vote() and plusone_get_total() in the preceding code, so let s create those: /** * Return the number of votes for a given node ID/user ID pair */ function plusone_get_vote($nid, $uid) { $vote_count = db_query('SELECT vote_count FROM {plusone_votes} WHERE nid = :nid AND uid = :uid', array(':nid' => $nid, ':uid' => $uid))->fetchField(); return $vote_count; } /** * Return the total vote count for a node */ function plusone_get_total($nid) { $total_count = db_query('SELECT SUM(vote_count) from {plusone_votes} where nid = :nid', array(':nid' => $nid)); return ($total_count); } Now, let s focus on getting the voting widget to display alongside the posts There are two parts to this First, I ll gather the information required to display the widget on hook_node_load()..

This chapter is a sort of catchall chapter, where more minor security topics are covered in a central location. But many of the improvements and new features in Windows Vista are security related, and we ve given them the attention they deserve in other parts of this book. Here is a list of other chapters where we cover securityrelated features and processes: User Account Control (UAC) and Network Access Protection (NAP), covered in 7 NTFS file and folder permissions, covered in 10 BitLocker, the drive encryption system, covered in 11 New security and hardening improvements in Windows Internet Explorer, covered in 17 The Windows Firewall with Advanced Security, covered in 27 Windows Defender, the new anti-malware solution, covered in 28

A DLR expression can have child expressions The child expressions can in turn have their own child expressions, and so on All together, the expressions form a tree There is one root expression in the tree The leaves of the tree are the terminal expressions that don t have any child expression of their own Every expression in the tree is immutable Once it s created, its states are read-only and can t be changed The only way to achieve the effect of changing the states of an expression is to create a new expression and toss out the old one The concept I ve just described is termed immutability Immutability is a very generic programming concept, and it s not specific to DLR Expression The class SystemString is immutable, as are many other classes that have no relation to DLR Expression.

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