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Note Although LINQ queries look similar to SQL queries, the syntax is not identical. In fact, many LINQ queries seem to be the exact opposite format of a similar database query! If you attempt to map LINQ directly to SQL, you will surely become frustrated. To keep your sanity, I d recommend that you try your best to regard LINQ queries as unique entities, which just happen to look similar to SQL.

When LINQ was first introduced to the .NET platform in version 3.5, the C# (and VB) languages were each expanded with a large number of new programming constructs used to support the LINQ technology set. Specifically, the C# language uses the following core LINQ-centric features: Implicitly typed local variables Object/collection initialization syntax Lambda expressions Extension methods Anonymous types

Calling an Action Directly with actions_do()

These features have already been explored in detail within various chapters of the text. However, to get the ball rolling, let s quickly review each feature in turn, just to make sure we are all in the proper mindset.

Before you turn that code into a script, you need to make two decisions: what you will call the file and where you will put it. The name should be unique (that is, it should not conflict with any other commands), and you should put it where the shell can find it.

In 3, you learned about the var keyword of C#. This keyword allows you to define a local variable without explicitly specifying the underlying data type. The variable, however, is strongly typed as the compiler will determine the correct data type based on the initial assignment. Recall the following code example from 3: static void DeclareImplicitVars() { // Implicitly typed local variables. var myInt = 0; var myBool = true; var myString = "Time, marches on..."; // Print out the underlying type. Console.WriteLine("myInt is a: {0}", myInt.GetType().Name); Console.WriteLine("myBool is a: {0}", myBool.GetType().Name); Console.WriteLine("myString is a: {0}", myString.GetType().Name); } This language feature is very helpful, and often mandatory, when using LINQ. As you will see during this chapter, many LINQ queries will return a sequence of data types which are not known until compile time. Given that the underlying data type is not known until the application is compiled, you obviously can t declare a variable explicitly!

The trigger module is only one way to call actions. You might want to write a separate module that calls actions and prepare the parameters yourself. If so, using actions_do() is the recommended way to call actions. The function signature follows: actions_do($action_ids, $object = NULL, $context = NULL, $a1 = NULL, $a2 = NULL)

5 explored the role of object initialization syntax, which allows you to create a class or structure variable, and set any number of its public properties, in one fell swoop. The end result is a very compact (yet still easy on the eyes) syntax which can be used to get your objects ready for use. Also recall from 10, the C# language allows you to use a very similar syntax to initialize collections of objects. Consider the following code snippet which uses collection initialization syntax to fill a List<T> of Rectangle objects, each of which maintains two Point objects to represent an (x,y) position: List<Rectangle> myListOfRects = new List<Rectangle> { new Rectangle {TopLeft = new Point { X = 10, Y = 10 }, BottomRight = new Point { X = 200, Y = 200}}, new Rectangle {TopLeft = new Point { X = 2, Y = 2 }, BottomRight = new Point { X = 100, Y = 100}}, new Rectangle {TopLeft = new Point { X = 5, Y = 5 }, BottomRight = new Point { X = 90, Y = 75}} }; While you are never required to use collection/object initialization syntax, you do end up with a more compact code base. Furthermore, this syntax, when combined with implicit typing of local variables, allows you to declare an anonymous type, which is very useful when creating a LINQ projection. You ll learn about LINQ projections later in this chapter.