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The standard query operators are methods declared in class System.Linq.Enumerable. These methods, however, aren t just any methods they are extension methods that extend generic class IEnumerable<T>. Extension methods were covered in s 7 and 19, but the most important thing to remember about them is that they are public, static methods that, although defined in one class, are designed to add functionality to a different class the one listed as the first formal parameter. This formal parameter must be preceded by the keyword this. For example, the following are the signatures of three of the operators: Count, First, and Where. At first glance, the signatures of the operators can be somewhat intimidating. Notice the following about the signatures: Since the operators are generic methods, they have a generic parameter (T) associated with their names. Since the operators are extension methods that extend IEnumerable<T>, they must satisfy the following syntactic requirements: They must be declared public and static. They must have the this extension indicator before the first parameter. They must have IEnumerable<T> as the first parameter type.

eToys assumed that loyal customers would come back once they had been acquired. On the Web, customers soon learn that it is very easy to shop around and they do. Proximity works with bricks-and-mortar stores. You can drive to them, park in their parking lots, and go inside. The Web is very different. It is very hard to create and maintain customer loyalty on the Web. eToys could not count on its customers coming back, and they didn t. Even given the competition, eToys assumed that the growth of the Web would provide enough buyers for everyone. The company planned to double its sales every year. That was achievable only when sales were very small. In fact, competitors multiplied and national sales grew only modestly, and so eToys forecasts were worthless. Perhaps eToys biggest mistake was spending too much to create a distribution network. The company s investment in property and equipment amounted to more than $120 million. This meant that property investment equaled about 95 percent of the year s revenue. A similar gure for retailers was 20 percent, and one for catalogers was 13 percent. Faced with these investments, eToys could not make a pro t without a massive sales increase. That increase did not occur.

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Always Name and First public, static generic param parameter public static int Count<T>( this IEnumerable<T> source ); public static T First<T>( this IEnumerable<T> source ); public static IEnumerable<T> Where<T>( this IEnumerable<T> source, ... ); Return Extension type indicator

The Web has proved to be an excellent transaction medium for business-to-business dealings. Some companies selling memory chips for computers, for example, have registered sales of several hundred million dollars per year. For a few, these transactions represent more than 85 percent of their total revenue. Their sales are to companies that buy computer components to install in units for sale or to upgrade their own equipment. This type of Web transaction will continue to grow in the years ahead. How do customers nd out about these transaction sites About a third of them comes from advertisements placed in print magazines, a third comes from Web ads on technical sites, and the remainder comes from search engines. Many have established premier pages for their best customers. On these pages, their best customers have established accounts,

For example, the following code shows the use of operators Count and First. Both operators take only a single parameter the reference to the IEnumerable<T> object. The Count operator returns a single value, which is the count of all the elements in the sequence. The First operator returns the first element of the sequence.

The first two times the operators are used in this code, they are called directly, just like normal methods, passing the name of the array as the first parameter. In the following two lines, however, they are called using the extension method syntax, as if they were method members of the array, which is enumerable. Notice that in this case no parameter is supplied. Instead, the array name has been moved from the parameter list to before the method name. There it is used as if it contained a declaration of the method. The direct syntax calls and the extension syntax calls are completely equivalent in effect only their syntax is different. using System.Linq; ... static void Main( ) { int[] intArray = new int[] { 3, 4, 5, 6, 7, 9 }; Array as parameter var count1 = Enumerable.Count(intArray); // Called directly var firstNum1 = Enumerable.First(intArray); // Called directly var count2 = intArray.Count(); // Called as extension var firstNum2 = intArray.First(); // Called as extension Array as extended object Console.WriteLine("Count: {0}, FirstNumber: {1}", count1, firstNum1); Console.WriteLine("Count: {0}, FirstNumber: {1}", count2, firstNum2); } This code produces the following output: Count: 6, FirstNumber: 3 Count: 6, FirstNumber: 3

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