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Address address = new Address { address = "105 Elm Street", city = "Atlanta", state = "GA", postalCode = "30339" }; You can get away with that in a lambda expression. Also, remember these object initialization capabilities can be used anywhere, not just with LINQ queries.

When using object initialization, the compiler instantiates the object using the class s parameterless constructor, and then it initializes the named members with the specified values. Any members that are not specified will have the default value for their data type.

An extension method is a static method of a static class that you can call as though it were an instance method of a different class. For example, you could create an extension method named ToDouble that is a static method in a static class you create named StringConversions, but that is called as though it were a method of an object of type string. Before I explain extension methods in detail, let s first review the problem that lead to their creation by discussing static (class) versus instance (object) level methods. Instance level methods can only be called on instances of a class, otherwise known as objects. You cannot call an instance level method on the class itself. Likewise, static methods must be called on the class, as opposed to an instance of a class.

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You now have a foundation for the JSF deck component with the behavioral components, including event and listener support. It is time to start looking at rendering the deck component. Following the naming pattern, discussed earlier in this chapter, the fully qualified class name for the UIShowOne component s Renderer is com.apress.projsf.ch3.render.html.basic. HtmlUIShowOneDeckRenderer.

As if the object initialization enhancements were not enough, someone at Microsoft must have said, What about collections Collection initialization allows you to specify the initialization values for a collection, just like you would for an object. As an example of collection initialization, consider the code in Listing 2-9.

Listing 11-2. Putting It All Together string connectionString = @"Data Source=.\SQLEXPRESS;Initial Catalog=Northwind;Integrated Security=SSPI;"; SqlDataAdapter dataAdapter = new SqlDataAdapter( @"SELECT O.EmployeeID, E.FirstName + ' ' + E.LastName as EmployeeName, O.CustomerID, C.CompanyName, O.ShipCountry FROM Orders O JOIN Employees E on O.EmployeeID = E.EmployeeID JOIN Customers C on O.CustomerID = C.CustomerID", connectionString); DataSet dataSet = new DataSet(); dataAdapter.Fill(dataSet, "EmpCustShip"); // All code prior to this comment is legacy code.

using System.Collections.Generic; List<string> presidents = new List<string> { "Adams", "Arthur", "Buchanan" }; foreach(string president in presidents) { Console.WriteLine(president); } When running the example by pressing Ctrl+F5, you get the following results: Adams Arthur Buchanan In addition to using collection initialization with LINQ, it can be very handy for creating initialized collections in code where LINQ queries are not even present.

Creating a language-level API for generic data query is made more difficult by the C# language s lack of ability to dynamically create new data types at compile time. If we want data queries to retrieve firstclass language-level elements, the language must have the ability to create first-class language-level data elements, which for C# are classes. So, the C# language specification now includes the ability to dynamically create new unnamed classes and objects from those classes. This type of class is known as an anonymous type. An anonymous type has no name and is generated by the compiler based on the initialization of the object being instantiated. Since the class has no type name, any variable assigned to an object of an anonymous type must have some way to declare it. This is the purpose of the C# var keyword. The anonymous type is invaluable when projecting new data types using the Select or SelectMany operators. Without anonymous types, predefined named classes would always have to exist for the purpose of projecting data into the predefined named classes when calling the Select or SelectMany operators. It would be very inconvenient to have to create named classes for every query. In the Object Initialization section of this chapter, we discussed the following object instantiation and initialization code:

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