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Why only the one parameter There are good computer-sciencephilosophical reasons for it. In mathematical logic, a predicate is usually defined as follows: P : X { true, false } That can be read as a Predicate of some entity X maps to true or false . The single parameter in the mathematical expression is an important limitation, allowing us to build more complex systems from the simplest possible building blocks. This formal notion gives rise to the single parameter in the .NET Predicate<T> class, however pragmatically useful it may be to have more than one parameter in your particular application.

We can delete our Check delegate (Hurrah! More code removed!), and replace it with a Predicate<T> that takes a Document as its type parameter:

And we can update the DocumentProcessor to make use of Predicate<T>, as shown in Example 5-14.

b) b, int c) b) b)

class DocumentProcessor { class ActionCheckPair { public Action<Document> Action { get; set; } public Predicate<Document> 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,

{ } }

Predicate<Document> quickCheck) processes.Add( new ActionCheckPair { Action = action, QuickCheck = quickCheck });

// ...

Date.now = function() { return new Date(); }

{ { { {

We can now update our client code to use our new DocumentProcessor API, calling AddProcess now that the list of processes is private (see Example 5-15).

static DocumentProcessor Configure() { DocumentProcessor rc = new DocumentProcessor(); rc.AddProcess(DocumentProcesses.TranslateIntoFrench); rc.AddProcess(DocumentProcesses.Spellcheck); rc.AddProcess(DocumentProcesses.Repaginate); TrademarkFilter trademarkFilter = new TrademarkFilter(); trademarkFilter.Trademarks.Add("Ian"); trademarkFilter.Trademarks.Add("Griffiths"); trademarkFilter.Trademarks.Add("millennium"); rc.AddProcess(trademarkFilter.HighlightTrademarks); } return rc;

For the time being, we re using the overload of AddProcess that doesn t supply a quickCheck, so if we compile and run, we get the same output as before:

Processing document 1 Document traduit. Spellchecked document. Repaginated document. Processing document 2 Document traduit. Spellchecked document. Repaginated document. Highlighting 'millennium'

b; } b + c; } b; } b; }

OK, the idea here was to allow our production team to quickly configure a check to see if the process was likely to fail, before embarking on a resource-intensive task. Let s say DocumentProcesses.TranslateIntoFrench is a very time-consuming function, and they ve discovered that any document whose text contains a question mark ( ) will fail. They ve raised a bug with the machine translation team, but they don t want to hold up the entire production process until it is fixed only 1 in 10 documents suffer from this problem.

They need to add a quick check to go with the TranslateIntoFrench process. It is only one line of code:

return !doc.Contains(" ");

They could create a static class, with a static utility function to use as their predicate, but the boilerplate code would be about 10 times as long as the actual code itself. That s a barrier to readability, maintenance, and therefore the general well-being of the developer. C# comes to our rescue with a language feature called the anonymous method.

Here, you extend the built-in Date object with a now method that you can use to retrieve the current date and time. The now method is invoked directly on the Date type rather than on an instance:

The following code shows an illegal attempt at overloading the method name AddValues. The two methods differ on the return types and the names of the formal parameters. But they still have the same signature, because they have the same method name, and the number, types, and order of their parameters are the same. The compiler would produce an error message for this code. class B Signature { long AddValues( long int AddValues( long } Signature

An anonymous method is just like a regular function, except that it is inlined in the code at the point of use. Let s update the code in our Configure function to include a delegate to an anonymous method to perform the check:

rc.AddProcess( DocumentProcesses.TranslateIntoFrench, delegate(Document doc) { return !doc.Text.Contains(" "); });

The delegate to the anonymous method (i.e., the anonymous delegate) is passed as the second parameter to our AddProcess method. Let s pull it out so that we can see it a little more clearly (there s no need to make this change in your code; it is just for clarity):

Predicate<Document> predicate = delegate(Document doc) { return !doc.Text.Contains(" "); }

b) { return a+b; } d) { return a+b; }

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