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We ve established that the function signature for actions is example_action($object, $context). Let s examine each of those parameters in detail. $object: Many actions act on one of Drupal s built-in objects: nodes, users, taxonomy terms, and so on. When an action is executed by trigger.module, the object that is currently being acted upon is passed along to the action in the $object parameter. For example, if an action is set to execute when a new node is created, the $object parameter will contain the node object. $context: An action can be called in many different contexts. Actions declare which triggers they support by defining the hooks key in hook_action_info(). But actions that support multiple triggers need some way of determining the context in which they were called. That way, an action can act differently depending on the context.

{ public int X { get; set; } public int Y { get; set; } public Point(int xVal, int yVal) { X = xVal; Y = yVal; } public Point() { } public void DisplayStats() { Console.WriteLine("[{0}, {1}]", X, Y); } } Now consider how we can make Point objects using any of the following approaches: static void Main(string[] args) { Console.WriteLine("***** Fun with Object Init Syntax *****\n"); // Make a Point by setting each property manually. Point firstPoint = new Point(); firstPoint.X = 10; firstPoint.Y = 10; firstPoint.DisplayStats(); // Or make a Point via a custom constructor. Point anotherPoint = new Point(20, 20); anotherPoint.DisplayStats(); // Or make a Point using object init syntax. Point finalPoint = new Point { X = 30, Y = 30 }; finalPoint.DisplayStats(); Console.ReadLine(); } The final Point variable is not making use of a custom constructor (as one might do traditionally), but is rather setting values to the public X and Y properties. Behind the scenes, the type s default constructor is invoked, followed by setting the values to the specified properties. To this end, object initialization syntax is just shorthand notations for the syntax used to create a class variable using a default constructor, and setting the state data property by property.

The previous examples initialized Point types by implicitly calling the default constructor on the type: // Here, the default constructor is called implicitly Point finalPoint = new Point { X = 30, Y = 30 }; If you wish to be very clear about this, it is permissible to explicitly call the default constructor as follows: // Here, the default constructor is called explicitly Point finalPoint = new Point() { X = 30, Y = 30 }; Do be aware that when you are constructing a type using the new initialization syntax, you are able to invoke any constructor defined by the class Our Point type currently defines a two-argument constructor to set the (x, y) position.

Let s set up a scenario. Suppose you are running a web site that presents controversial issues. Here s the business model: users pay to register and may leave only a single comment on the web site. Once they have posted their comment, they are blocked and must pay again to get unblocked. Ignoring the economic prospects for such a site, let s focus on how we could implement this with triggers and actions.

Therefore, the following Point declaration results in an X value of 100 and a Y value of 100, regardless of the fact that our constructor arguments specified the values 10 and 16: // Calling a custom constructor Point pt = new Point(10, 16) { X = 100, Y = 100 }; Given the current definition of your Point type, calling the custom constructor while using initialization syntax is not terribly useful (and more than a bit verbose) However, if your Point type provides a new constructor that allows the caller to establish a color (via a custom enum named PointColor), the combination of custom constructors and object initialization syntax becomes clear.

Assume you have updated Point as follows: public enum PointColor { LightBlue, BloodRed, Gold } class Point { public int X { get; set; } public int Y { get; set; } public PointColor Color{ get; set; } public Point(int xVal, int yVal) { X = xVal; Y = yVal; Color = PointColorGold; } public Point(PointColor ptColor) { Color = ptColor; } public Point() : this(PointColorBloodRed){ } public void DisplayStats() { ConsoleWriteLine("[{0}, {1}]", X, Y); ConsoleWriteLine("Point is {0}", Color);.