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static void Main() { XDocument customerXml = CreateCustomerListXml(); Console.WriteLine("Search for single element..."); var query = from customer in customerXml.Element("Customers").Elements("Customer") where customer.Attribute("FirstName").Value == "Douglas" select customer; XElement oneCustomer = query.SingleOrDefault(); if (oneCustomer != null) { Console.WriteLine(oneCustomer); } else { Console.WriteLine("Not found"); } Console.WriteLine("\nSearch using descendant axis... "); query = from customer in customerXml.Descendants("Customer") where customer.Attribute("FirstName").Value == "Douglas" select customer; oneCustomer = query.SingleOrDefault(); if (oneCustomer != null) { Console.WriteLine(oneCustomer); } else { Console.WriteLine("Not found"); } Console.WriteLine("\nSearch using element values... "); query = from emailAddress in customerXml.Descendants("EmailAddress") where emailAddress.Value == "dAdams@foo.com"

select emailAddress; XElement oneEmail = query.SingleOrDefault(); if (oneEmail != null) { Console.WriteLine(oneEmail); } else { Console.WriteLine("Not found"); } Console.WriteLine("\nSearch using child element values... "); query = from customer in customerXml.Descendants("Customer") where customer.Element("EmailAddress").Value == "dAdams@foo.com" select customer; oneCustomer = query.SingleOrDefault(); if (oneCustomer != null) { Console.WriteLine(oneCustomer); } else { Console.WriteLine("Not found"); } } } // end main // end class // end namespace

}

As you saw, the name of a namespace can contain the name of the company that created the assembly. The name is also used to help programmers get a quick idea of the kinds of types defined in the namespace. Some important points about the names of namespaces are the following: A namespace name can be any valid identifier. A namespace name can include the period character, which is used to organize types into hierarchies. For example, the following are the names of some of the namespaces in the .NET BCL: System System.Data System.Drawing System.Drawing.Drawing2D System.IO Microsoft.CSharp Microsoft.VisualBasic Microsoft.VisualBasic.IO

Output: Search for single element... <Customer FirstName="Douglas" LastName="Adams"> <EmailAddress>dAdams@foo.com</EmailAddress> </Customer> Search using descendant axis... <Customer FirstName="Douglas" LastName="Adams"> <EmailAddress>dAdams@foo.com</EmailAddress> </Customer> Search using element values... <EmailAddress>dAdams@foo.com</EmailAddress> Search using child element values... <Customer FirstName="Douglas" LastName="Adams"> <EmailAddress>dAdams@foo.com</EmailAddress> </Customer>

This example refactors Example 12-3 by extracting the creation of the sample customer list XML document into the CreateCustomerListXml() method. You can now simply call this function in the Main() function to create the XML document.

C# has a set of rules for working out the order in which to evaluate the components of an expression. It does not necessarily work from left to right, because some operators have a higher precedence than others. For example, imagine evaluating this: 1.0 + 3.0 / 4.0 from left to right. Start with 1.0, add 3.0 which gets you to 4.0, and then divide by 4.0 the result would be 1.0. But the conventional rules of arithmetic mean the result should be one and three quarters. And that s just what C# produces the result is 1.75. The division is performed before the addition, because division has higher precedence than division. Some groups of operators have equal precedence. For example, multiplication and division have equal precedence. When expressions contain multiple operations with the same precedence, mathematical operations are evaluated from left to right. So 10.0 / 2.0 * 5.0 evaluates to 25.0. But parentheses trump precedence, so 10.0 / (2.0 * 5.0) evaluates to 1.0. Some programming books go into great depths about all the details of precedence, but it makes for exceptionally tedious reading C# has 15 different levels of precedence. The details are important for compiler writers, but of limited value for developers code that relies heavily on precedence can be hard to read. Using parentheses to make evaluation order explicit can often improve clarity. But if you would like the gory details, you can find them at http://msdn.microsoft.com/en-us/library/aa691323.

Now you can safely say that the component is ready for use. The $create method is a lifesaver because it performs the entire procedure automatically. You can use $create to instantiate, configure, and initialize any client component in a single statement. You can also add event handlers and event references to child components. $create is a powerful method that accepts various arguments. Figure 8.6 shows an example $create statement and points out the arguments passed to the method. The first argument passed to $create is always the fully qualified name of the component to instantiate. The client component class must derive from Sys.Component; otherwise, a client exception will be thrown. The last argument is the associated DOM element, which is mandatory for visual components (behaviors or controls). A nonvisual component like the trivial component doesn t need an associated element; a client error will occur if one is specified. The remaining arguments are objects, passed as objects literals, used to configure the component after instantiation and before initialization. As an alternative

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