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One of the most important reasons why generics were added to C# was to give the language the ability to have data collections with static type checking. Prior to generics barring creating your own specific collection type for every type of data for which you wanted a collection there was no way to ensure that every element in a legacy collection, such as an ArrayList, Hashtable, and so on, was of the same and correct type. Nothing in the language prevented code from adding a Textbox object to an ArrayList meant to contain only Label objects. Since the introduction of generics in version 2.0, C# developers have had a way to explicitly state that a collection can contain only those elements of a specified type. Although either the OfType or Cast operator may work for a legacy collection, Cast requires that every object in the collection be of the correct type, which is the fundamental original flaw in the legacy collections for which generics were created. When using the Cast operator, if any object is unable to be cast to the specified data type, an exception is thrown. By contrast, with the OfType operator only objects of the specified type will be stored in the output IEnumerable<T> sequence, and no exception will be thrown. The best-case scenario is that every object will be of the correct type and be in the output sequence. The worst case is that some elements will get skipped, but they would have thrown an exception had the Cast operator been used instead.

ArgumentNullException is thrown if the source or func argument is null. InvalidOperationException is thrown if the input source sequence is empty, only for the first Aggregate prototype, where no seed value is provided.

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ILookup<string, Actor2> lookup = Actor2.GetActors() .ToLookup(k => k.birthYear, new MyStringifiedNumberComparer()); // Let's see if we can find the 'one' born in 1964. IEnumerable<Actor2> actors = lookup["0001964"]; foreach (var actor in actors) Console.WriteLine("{0} {1}", actor.firstName, actor.lastName); We are using the same equality comparison object we use in the Dictionary examples. In this case, we convert the input sequence to a Lookup, and we provide an equality comparison object because we know that the key, which is stored as a string, may sometimes contain leading zeros. Our equality comparison object knows how to handle that. Here are the results: Keanu Reeves Sandra Bullock Notice that when we try to retrieve all elements whose key is "0001964", we get back elements whose keys are "1964" and "01964". So we know our equality comparison object works. For the third prototype for the ToLookup operator, we will use the same Actor class that we use in the first prototype sample code for ToLookup. Listing 5-9 is our sample code calling the third ToLookup prototype.

I will begin with an example of the first prototype, shown in Listing 5-63. In the example, I calculate the factorial for the number 5. A factorial is the product of all positive integers less than or equal to some number. The factorial of 5 is the product of all positive integers less than or equal to 5. So, 5!, pronounced 5 factorial, will be equal to 1 * 2 * 3 * 4 * 5. It looks like I could use the Range operator and the Aggregate operator to calculate this. Listing 5-63. An Example of the First Aggregate Prototype int N = 5; IEnumerable<int> intSequence = Enumerable.Range(1, N); // I will just output the sequence so all can see it. foreach (int item in intSequence) Console.WriteLine(item);

ILookup<int, string> lookup = Actor.GetActors() .ToLookup(k => k.birthYear,

When developing a new component, it is a good practice to first create a prototype of the intended markup that will need to be rendered to the client. By doing so, you will not only find out which elements your component has to generate but also which renderer-specific attributes you will need in order to parameterize the generated markup. As you can see in Code Sample 2-1, the prototype markup consists of an HTML form <input> element, an <img> element, a <div> element, and a <style> element. By examining the HTML prototype, as shown in Code Sample 2-2, you can see that three HTML attributes title, name, and value are needed to parameterize the generated markup. Code Sample 2-1. HTML Prototype for the Input Date Component <style type="text/css" > .overlay { position:relative; left:-10px; bottom:-10px; } </style>

a => string.Format("{0} {1}", a.firstName, a.lastName)); // Let's see if we can find the 'one' born in 1964. IEnumerable<string> actors = lookup[1964]; foreach (var actor in actors) Console.WriteLine("{0}", actor); For our elementSelector, we just concatenate the firstName and lastName members. Here are the results: Keanu Reeves Sandra Bullock Using the elementSelector variation of the ToLookup operator allows me to store a different data type in the Lookup than the input sequence element s data type. For an example of the fourth ToLookup prototype, we will use our Actor2 class and our common MyStringifiedNumberComparer class. Listing 5-10 is our sample code.

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