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Now we want to be able to process the document. At the very least, we want to be able to Spellcheck, Repaginate, or Translate it (into French, say). Because we can t change the Document class, we ll implement these methods in a static utility class of common processes, as we learned in 3. Example 5-2 shows this class, although the implementations are obviously just placeholders we re illustrating how to structure the code here, and trying to write a real spellchecker would be a rather large distraction.

static class DocumentProcesses { public static void Spellcheck( Document doc ) { Console.WriteLine("Spellchecked document."); } public static void Repaginate( Document doc) { Console.WriteLine("Repaginated document."); } public static void TranslateIntoFrench( Document doc ) { Console.WriteLine("Document traduit."); } } // ...

Now we can build a simple example of a document processor that translates, spellchecks, and then repaginates the document (see Example 5-3).

Like reference parameters, the formal parameters act as aliases for the actual parameters. Both the formal parameter and the actual parameter are names for the same memory location. Clearly, any changes made to a formal parameter in the method will be visible through the actual parameter variable after the method. Unlike reference parameters, output parameters require the following: Before the method call, you do not have to initialize or assign values to the actual parameter variables. The initial values of the actual parameters are irrelevant. Inside the method, an output parameter must be assigned to, before it can be read from. Every output parameter must be assigned to, before the method exits.

In listing 3.3, you access the prototype of the Cat function and add a speak method. The speak method calls the alert function to display a string with the voice of a (hungry) cat. What are the consequences of adding a method to the prototype object of the constructor First, whenever you create an object with the new operator and the Cat constructor, the new instance inherits the speak method, as shown in the following code:

static class DocumentProcessor { public static void Process(Document doc) { DocumentProcesses.TranslateIntoFrench(doc); DocumentProcesses.Spellcheck(doc); DocumentProcesses.Repaginate(doc); } }

And we can call on it from our main function, to process a couple of documents, as shown in Example 5-4.

class Program { static void Main(string[] args) { Document doc1 = new Document { Author = "Matthew Adams", DocumentDate = new DateTime(2000, 01, 01), Text = "Am I a year early " }; Document doc2 = new Document { Author = "Ian Griffiths",

};

Since the code inside the method must write to an output variable before it can read from it, it is impossible to send data into a method by using output parameters. As a matter of fact, if there is any execution path through the method that attempts to read the value of an output parameter before the method has assigned it a value, the compiler produces an error message. public void Add2( out int InRef ) { int var1 = InRef + 2; // Error! Cannot read from an output variable } // before it has been assigned to by the method. For example, the following code again shows method MyMethod, but this time using output parameters. class MyClass { public int Val = 20; } class Program { static void { f1 = new f1.Val = f2 = }

DocumentDate = new DateTime(2001, 01, 01), Text = "This is the new millennium, I promise you."

Console.WriteLine("Processing document 1"); DocumentProcessor.Process(doc1); Console.WriteLine(); Console.WriteLine("Processing document 2"); DocumentProcessor.Process(doc2); } Console.ReadKey();

}

Compile and run that, and you ll see the following output:

out modifier out modifier MyMethod(out MyClass f1, out int f2) MyClass(); 25; 15; // Create an object of the class. // Assign to the class field. // Assign to the int param.

var cat = new Cat(); cat.speak();

Processing document 1 Document traduit. Spellchecked document. Repaginated document. Processing document 2 Document traduit. Spellchecked document. Repaginated document.

We encapsulated a particular set of processing instructions, executed in a particular order, in this (static) DocumentProcessor class so that we can easily reuse it with different client applications that want a standard, reliable means of performing our translate into French process. So far, this should all be pretty familiar. But what about a different set of processing operations, one that leaves the document in its native language and just spellchecks and repaginates We could just create a second DocumentProcessor-like class, and encapsulate the relevant method calls in a process function:

static class DocumentProcessorStandard { public static void Process(Document doc) { DocumentProcesses.Spellcheck(doc); DocumentProcesses.Repaginate(doc); } }

And then we could add some calls to that processor in our Main method:

static void Main() { MyClass A1 = null; int A2; MyMethod(out A1, out A2); out modifiers // Call the method.

Console.WriteLine(); Console.WriteLine("Processing document 1 (standard)"); DocumentProcessorStandard.Process(doc1); Console.WriteLine(); Console.WriteLine("Processing document 2 (standard)"); DocumentProcessorStandard.Process(doc2);

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