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Compile and run, and you ll see that we still get our expected output. If you were watching the IntelliSense as you were typing in that code, you will have noticed that there are several Action<> types in the framework: Action<T>, Action<T1,T2>, Action<T1,T2,T3>, and so on. As you might expect, these allow you to define delegates to methods which return void, but which take two, three, or more parameters. .NET 4 provides Action<> delegate types going all the way up to 16 parameters. (Previous versions stopped at four.) OK, let s suppose that everything we ve built so far has been deployed to the integration test environment, and the production folks have come back with a new requirement. Sometimes they configure a processing sequence that fails against a particular document and it invariably seems to happen three hours into one of their more complex processes. They have some code which would let them do a quick check for some of their more compute-intensive processes and establish whether they are likely to fail. They want to know if we can implement this for them somehow. One way we might be able to do this is to provide a means of supplying an optional check function corresponding to each action function. We could then iterate all of the check functions first (they are supposed to be quick), and look at their return values. If any fail, we can give up (see Figure 5-3). We could implement that by rewriting our DocumentProcessor as shown in Example 5-13.

class DocumentProcessor { class ActionCheckPair { public Action<Document> Action { get; set; } public Check QuickCheck { get; set; } } private readonly List<ActionCheckPair> processes = new List<ActionCheckPair>(); public void AddProcess(Action<Document> action) { AddProcess(action, null); } public void AddProcess(Action<Document> action, Check quickCheck) { processes.Add( new ActionCheckPair { Action = action, QuickCheck = quickCheck }); } public void Process(Document doc) { // First time, do the quick check foreach( ActionCheckPair process in processes) { if (process.QuickCheck != null && !process.QuickCheck(doc))

In this code, treating the String type as a constructor returns an object of type String. You add a createdOn property that returns a Date object containing the date when the string was created. A second way to add a property to an object is to do so before an instance is created. You can do this using a constructor and its prototype object, as we explained in sections 3.1.4 and 3.1.5. For example, the following code shows how to define an object with two properties x and y, using a Point constructor:

{ }

Console.WriteLine("The process will not succeed."); return;

So far, you know that local variables and parameters are kept on the stack. Let s look at that organization a little further. When a method is called, memory is allocated at the top of the stack, to hold a number of data items associated with the method. This chunk of memory is called the stack frame for the method. The stack frame contains memory to hold the following: The return address that is, where to resume execution when the method exits Those parameters that allocate memory, that is, the value parameters of the method, and the parameter array if there is one Various other administrative data items relevant to the method call When a method is called, its entire stack frame is pushed onto the stack. When the method exits, its entire stack frame is popped from the stack. Popping a stack frame is sometimes called unwinding the stack. For example, the following code declares three methods. Main calls MethodA, which calls MethodB, creating three stack frames. As the methods exit, the stack unwinds. class Program { static void MethodA( int par1, int par2) { Console.WriteLine("Enter MethodA: {0}, {1}", par1, par2); MethodB(11, 18); // Call MethodB. Console.WriteLine("Exit MethodA"); } static void MethodB(int par1, int par2) { Console.WriteLine("Enter MethodB: {0}, {1}", par1, par2); Console.WriteLine("Exit MethodB"); } static void Main( ) { Console.WriteLine("Enter Main"); MethodA( 15, 30); Console.WriteLine("Exit Main"); } }

}

}

}

// Then perform the action foreach (ActionCheckPair process in processes) { process.Action(doc); }

This code produces the following output: Enter Enter Enter Exit Exit Exit Main MethodA: 15, 30 MethodB: 11, 18 MethodB MethodA Main

There are quite a few new things to look at here. First, we declared a new class inside our DocumentProcessor definition, rather than in the namespace scope. We call this a nested class. We chose to nest the class because it is private to the DocumentProcessor, and we can avoid polluting the namespace with implementation details. Although you can make nested classes publicly accessible, it is unusual to do so and is considered a bad practice. This nested class just associates a pair of delegates: the Action<Document> that does the work, and the corresponding Check that performs the quick check. We removed the public property for our list of processes, and replaced it with a pair of AddProcess method overloads. These allow us to add processes to the sequence; one takes both the action and the check, and the other is a convenience overload that allows us to pass the action only.

Notice how we had to change the public contract for our class because we initially exposed the list of processes directly. If we d made the list an implementation detail and provided the single-parameter AddProcess method in the first place, we wouldn t now need to change our clients as we d only be extending the class.

function Point() { this.x = 0; this.y = 0; } Point.prototype.setLocation = function(x, y) { this.x = x; this.y = y; }

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