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While this works just fine, it is such a common thing to need to do with a delegate that C# lets us dispense with .Invoke entirely and treat the delegate as though it really was the function to which it delegates:

process(doc);

When you use an invocation with separate actual parameters for a parameter array, the compiler does the following: Takes the list of actual parameters and uses them to create and initialize an array in the heap. Stores the reference to the array in the formal parameter on the stack. If there are no actual parameters at the position corresponding to the formal parameter array, the compiler creates an array with 0 elements and uses that. For example, the following code declares a method called ListInts, which takes a parameter array. Main declares three ints and passes them to the array. class MyClass Parameter array { public void ListInts( params int[] inVals ) { if (inVals != null) for (int i = 0; i < inVals.Length; i++) // Process the array. { inVals[i] = inVals[i] * 10; Console.WriteLine("{0} ", inVals[i]); // Display new value. } } } class Program { static void Main() { int first = 5, second = 6, third = 7;

Here s the final version of our Process method:

public void Process(Document doc) { foreach(DocumentProcess process in Processes) { process(doc); } }

var book = {}; book.title = 'ASP.NET AJAX in Action'; book.publisher = 'Manning';

This can take a bit of getting used to, because our variable names are usually camelCased and our method names are usually PascalCased. Using function call syntax against a camelCased object can cause severe cognitive dissonance. I ve still never really gotten used to it myself, and I always feel like I need a sit-down and a cup of coffee when it happens.

Now we need to deal with the Configure method that sets up our processes. Rather than creating all those process classes, we need to create the delegate instances instead. You can construct a delegate instance just like any other object, using new, and passing the name of the function to which you wish to delegate as a constructor parameter:

MyClass mc = new MyClass(); mc.ListInts( first, second, third ); // Call the method. Actual parameters Console.WriteLine("{0}, {1}, {2}", first, second, third); } } This code produces the following output: 50 60 70 5, 6, 7

static DocumentProcessor { DocumentProcessor rc rc.Processes.Add(new rc.Processes.Add(new rc.Processes.Add(new return rc; } Configure() = new DocumentProcessor(); DocumentProcess(DocumentProcesses.TranslateIntoFrench)); DocumentProcess(DocumentProcesses.Spellcheck)); DocumentProcess(DocumentProcesses.Repaginate));

However, C# has more syntactic shorthand that can do away with a lot of that boilerplate code. It can work out which delegate type you mean from context, and you only need to provide the method name itself:

static DocumentProcessor Configure() { DocumentProcessor rc = new DocumentProcessor(); rc.Processes.Add(DocumentProcesses.TranslateIntoFrench); rc.Processes.Add(DocumentProcesses.Spellcheck); rc.Processes.Add(DocumentProcesses.Repaginate); return rc; }

Not only have we achieved the same end in much less code, but we ve actually reduced coupling between our subsystems still further our DocumentProcessor doesn t depend on any classes other than the Document itself; it will work with any class, static or otherwise, that can provide a method that conforms to the appropriate signature, as defined by our delegate. So far, we ve only provided delegates to static functions, but this works just as well for an instance method on a class. Let s imagine we need to provide a trademark filter for our document, to ensure that we pick out any trademarks in an appropriate typeface. Example 5-10 shows our TrademarkFilter class.

Figure 5-10 illustrates the following about the values of the actual and formal parameters at various stages in the execution of the method: Before the method call, the three actual parameters are already on the stack. By the beginning of the method, the three actual parameters have been used to initialize an array in the heap, and the reference to the array has been assigned to formal parameter InputList. Inside the method, the code first checks to make sure that the array reference is not null, and then processes the array by multiplying each element in the array by 10, and storing it back. After method execution, the formal parameter, InputList, is out of scope.

class TrademarkFilter { readonly List<string> trademarks = new List<string>();

public List<string> Trademarks { get { return trademarks; } } public void HighlightTrademarks(Document doc) { // Split the document up into individual words string[] words = doc.Text.Split(' ', '.', ','); foreach( string word in words ) { if( Trademarks.Contains(word) ) { Console.WriteLine("Highlighting '{0}'", word); } } }

In addition, you can extend instances of the built-in types by adding new properties to them. For example, you could expand an object of type String as follows:

}

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