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Finally, if you want to build a query expression using the really verbose approach, you could avoid the use of lambdas/anonymous method syntax and directly create delegate targets for each Func<> type. Here is the final iteration of your query expression, modeled within a new class type named VeryComplexQueryExpression: class VeryComplexQueryExpression { public static void QueryStringsWithRawDelegates() { Console.WriteLine("***** Using Raw Delegates *****"); string[] currentVideoGames = {"Morrowind", "Uncharted 2", "Fallout 3", "Daxter", "System Shock 2"}; // Build the necessary Func<> delegates. Func<string, bool> searchFilter = new Func<string, bool>(Filter); Func<string, string> itemToProcess = new Func<string,string>(ProcessItem); // Pass the delegates into the methods of Enumerable. var subset = currentVideoGames .Where(searchFilter).OrderBy(itemToProcess).Select(itemToProcess); // Print out the results. foreach (var game in subset) Console.WriteLine("Item: {0}", game); Console.WriteLine(); } // Delegate targets. public static bool Filter(string game) {return game.Contains(" ");} public static string ProcessItem(string game) { return game; } } You can test this iteration of your string processing logic by calling this method within Main() method of the Program class as follows: VeryComplexQueryExpression.QueryStringsWithRawDelegates(); If you were to now run the application to test each possible approach, it should not be too surprising that the output is identical regardless of the path taken. Keep the following points in mind regarding how LINQ query expressions are represented under the covers: Query expressions are created using various C# query operators. Query operators are simply shorthand notations for invoking extension methods defined by the System.Linq.Enumerable type. Many methods of Enumerable require delegates (Func<> in particular) as parameters.

$this->assertNull($value, $message= % , $group= Other )

Any method requiring a delegate parameter can instead be passed a lambda expression. Lambda expressions are simply anonymous methods in disguise (which greatly improve readability). Anonymous methods are shorthand notations for allocating a raw delegate and manually building a delegate target method.

Whew! That might have been a bit deeper under the hood than you wish to have gone, but I hope this discussion has helped you understand what the user-friendly C# query operators are actually doing behind the scenes.

Summary

This function asserts that the variable $value resolves to NULL. $result = load_my_object(-1); $this->assertNull($result, t( Make sure we get NULL when trying to load an invalid object. ));

LINQ is a set of related technologies that attempts to provide a single, symmetrical manner to interact with diverse forms of data. As explained over the course of this chapter, LINQ can interact with any type implementing the IEnumerable<T> interface, including simple arrays as well as generic and nongeneric collections of data. As you have seen, working with LINQ technologies is accomplished using several C# language features. For example, given the fact that LINQ query expressions can return any number of result sets, it is common to make use of the var keyword to represent the underlying data type. As well, lambda expressions, object initialization syntax, and anonymous types can all be used to build very functional and compact LINQ queries. More importantly, you have seen how the C# LINQ query operators are simply shorthand notations for making calls on static members of the System.Linq.Enumerable type. As shown, most members of Enumerable operate on Func<T> delegate types, which can take literal method addresses, anonymous methods, or lambda expressions as input to evaluate the query.

Each of the applications in this book s first thirteen chapters was developed along the lines of traditional stand-alone applications, with all of the custom programming logic packaged within a single executable file (*.exe). However, a major aspect of the .NET platform is the notion of binary reuse, where applications make use of the types contained within various external assemblies (aka code libraries). In this chapter, we ll examine the core details of creating, deploying, and configuring .NET assemblies. You ll learn the construction of .NET namespaces and the distinction between single-file and multifile assemblies, as well as private and shared assemblies. Next, you ll explore exactly how the .NET runtime resolves the location of an assembly, and you ll come to understand the global assembly cache (GAC), application configuration files (*.config files), publisher policy assemblies, and the System.Configuration namespace.