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Merely being a consumer of LINQ does not require the developer to be very cognizant of expression trees. It is the vendor s developer who adds LINQ capability to a data storage product who needs to fully understand expression trees. Because of this, we don t cover them in any detail in this book.

ArgumentNullException is thrown if any arguments are null. InvalidOperationException is thrown if the source sequence is empty, or if the predicate never returns true or finds more than one element for which it returns true.

Be forewarned: it is nearly impossible to discuss the var keyword and implicit type inference without demonstrating object initialization or anonymous types. Likewise, it is nearly impossible to discuss object initialization or anonymous types without discussing the var keyword. All three of these C# language enhancements are tightly coupled. Before describing each of these three language features in detail because each will describe itself in terms of the other allow us to introduce all three simultaneously. Let s examine the following statement: var 1 mySpouse = new { 2 FirstName = "Vickey" 3 , LastName = "Rattz" 3 }; In this example, we declare a variable named mySpouse using the var keyword. It is assigned the value of an anonymous type that is initialized using the new object initialization features. That one line of code is taking advantage of the var keyword, anonymous types, and object initialization. 1 You can detect the line of code is using the var keyword because it is explicitly stated. 2You are able to detect there is an anonymous type because we use the new operator without specifying a named class. 3 And you can see the anonymous object is being explicitly initialized using the new object initialization feature. In a nutshell, the var keyword allows the data type of a local variable to be inferred based on the data type with which it has been initialized. Anonymous types allow new class data types to be created at

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compile time. True to the word anonymous, these new data types have no name. You can t very well create an anonymous data type if you don t know what member variables it contains, and you can t know what members it contains unless you know what types those members are. Lastly, you won t know what data type those new members are unless they are initialized. The object initialization feature handles all that. From that line of code, the compiler will create a new anonymous class type containing two public string members; the first is named FirstName, and the second is named LastName.

Listing 5-28 is an example of the first Single prototype using the common Employee class. Listing 5-28. Sample Code Calling the First Single Prototype Employee emp = Employee.GetEmployeesArray() .Where(e => e.id == 3).Single(); Console.WriteLine("{0} {1}", emp.firstName, emp.lastName); In this example, instead of wanting the query to produce a sequence, I just want a reference to a particular employee. The Single operator is very useful for this as long as you can ensure there will only be a single element in the sequence passed to it. In this case, since I called the Where operator and specified a unique key, I am safe. Here are the results:

The renderer type is already known by the <h:form> tag, and the component family can be located in the component s superclass, UIForm. The tag then calls a method called encodeBegin() on the component, which in turn calls the encodeBegin() method on the HtmlForm renderer. The encodeBegin() method on the Renderer calls methods on the ResponseWriter to write the markup for the HTML form element <form method="" action="">. All markup output from the ResponseWriter ends up in the <f:view> body content buffer. Figure 1-15 shows the closing process of the <h:form> tag.

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