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OK, let s go back and have a look at that log function. As we noted earlier, it isn t very useful right now. We can improve it by logging the name of the file we have processed after each output stage, to help the production team diagnose problems. Example 5-19 shows an update to the Main function to do that.

Search Operation (Query)

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", DocumentDate = new DateTime(2001, 01, 01), Text = "This is the new millennium, I promise you." }; Document doc3 = new Document { Author = "Matthew Adams", DocumentDate = new DateTime(2002, 01, 01), Text = "Another year, another document." }; string documentBeingProcessed = null; DocumentProcessor processor = Configure(); processor.LogTextProvider = (doc => documentBeingProcessed); documentBeingProcessed = "(Document 1)"; processor.Process(doc1); Console.WriteLine(); documentBeingProcessed = "(Document 2)"; processor.Process(doc2); Console.WriteLine(); documentBeingProcessed = "(Document 3)"; processor.Process(doc3); } Console.ReadKey();

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We added a third document to the set, just so that we can see more get processed. Then we set up a local variable called documentBeingProcessed. As we move through the documents we update that variable to reflect our current status. How do we get that information into the lambda expression Simple: we just use it!

Ready-to-use HTML escape functions are available in libraries in many programming languages. It is advisable to carefully check the documentation or source code (if available) that all necessary characters are indeed escaped. For example, it is easily overlooked that the Python function cgi.escape (available in the library included in the standard Python distribution) does not escape quote characters unless requested via an optional argument, and even then only escapes double-quote characters. In certain contexts, we require other escaping functions (e.g., for JavaScript string literals); we introduce these functions in the appropriate context.

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

The processing will not succeed. (Document 1) Document traduit. (Document 2) Spellchecked document. (Document 2) Repaginated document. (Document 2) Highlighting 'millennium' (Document 2) Document traduit. (Document 3) Spellchecked document. (Document 3) Repaginated document. (Document 3)

We took advantage of the fact that an anonymous method has access to variables declared in its parent scope, in addition to anything in its own scope. For more information about this, see the sidebar below.

In general, we call an instance of a function and the set of variables on which it operates a closure. In a pure functional language, a closure is typically implemented by taking a snapshot of the values of the variables at the time at which the closure is created, along with a reference to the function concerned, and those values are immutable. In C#, a similar technique is applied but the language allows us to modify those variables after the closure has been created. As we see in this chapter, we can use this to our advantage, but we have to be careful to understand and manage the scope of the variables in the closure to avoid peculiar side effects.

Suppose our application is producing output based on the following template fragment: <b>Error: Your query '%(query)s' did not return any results.</b>

We ve seen how to read variables in our containing scope, but what about writing back to them That works too. Let s create a process counter that ticks up every time we execute a process, and add it to our logging function (see Example 5-20).

static void Main(string[] args) { // ... (document setup) DocumentProcessor processor = Configure();

string documentBeingProcessed = "(No document set)"; int processCount = 0; processor.LogTextProvider = (doc => { }); documentBeingProcessed = "(Document 1)"; processor.Process(doc1); Console.WriteLine(); documentBeingProcessed = "(Document 2)"; processor.Process(doc2); Console.WriteLine(); documentBeingProcessed = "(Document 3)"; processor.Process(doc3); Console.WriteLine(); Console.WriteLine("Executed " + processCount + " processes."); } Console.ReadKey(); processCount += 1; return documentBeingProcessed;

We added a processCount variable at method scope, which we initialized to zero. We ve switched our lambda expression into the statement form with the braces so that we can write multiple statements in the function body. In addition to returning the name of the document being processed, we also increment our processCount. Finally, at the end of processing, we write out a line that tells us how many processes we ve executed. So our output looks like this:

The search operation is a keyword search that lets you see which blogs contain a given search string. This operation is the same as the search we did on the Technorati site when we typed the keyword Silverlight in the search box to return a list of blogs containing that term. The API version allows more features and gives you a way to use the search function on your own site. The query is made using a RESTful interface (refer to the discussion of this technology in 1 for more information). To make a query, you need to send either an HTTP GET or an HTTP POST request to http://api.technorati.com/search key=[apikey]&query= [words] with the mandatory parameters key and query and the additional optional parameters described in the following section.

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