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The previously mentioned method encodeChildren() depends on a read-only UIComponent property called rendersChildren. If the component has a renderer, then the component delegates to the Renderer to determine whether rendersChildren is true. A Renderer returns true for rendersChildren if it needs access to its children components to correctly render the output to the client. One example from the JSF standard is h:dataTable, where the number of column children is needed in advance to correctly render the HTML markup. If rendersChildren is true, the Renderer controls rendering for its entire subtree of components. This means when the JSP engine executes a tag that manages a component with rendersChildren set to true, instead of continuing to iterate through the component hierarchy, asking each component to render, it has to first create the component hierarchy so that the child component hierarchy is available to the parent component and its Renderer.

public static T ElementAt<T>( this IEnumerable<T> source, int index); If the sequence implements IList<T>, the IList interface is used to retrieve the indexed element directly. If the sequence does not implement IList<T>, the sequence is enumerated until the indexed element is reached. An ArgumentOutOfRangeException is thrown if the index is less than zero or greater than or equal to the number of elements in the sequence.

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<Name>Joe</Name> Wow, that s a nice change. But wait, it gets better. Of course, child nodes are included in the output, and since the WriteLine method doesn t have an explicit overload accepting an XElement, it calls the ToString method for you, as shown in Listing 7-8. Listing 7-8. Console.WriteLine Implicitly Calling the ToString Method on an Element to Produce an XML Tree XElement name = new XElement("Person", new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")); Console.WriteLine(name); And the following is the output: <Person> <FirstName>Joe</FirstName> <LastName>Rattz</LastName> </Person> Even more important, if you cast a node to a data type that its value can be converted to, the value itself will be output. Listing 7-9 shows another example, but I will also print out the node cast to a string. Listing 7-9. Casting an Element to Its Value s Data Type Outputs the Value XElement name = new XElement("Name", "Joe"); Console.WriteLine(name); Console.WriteLine((string)name); Here are the results of this code:

N ote In C#, indexes are zero-based. This means the first element s index is zero. The last element s index is the sequence s count minus one.

<Name>Joe</Name> Joe How slick is that Now how much would you pay And there are cast operators provided for string, int, int , uint, uint , long, long , ulong, ulong , bool, bool , float, float , double, double , decimal, decimal , TimeSpan, TimeSpan , DateTime, DateTime , GUID, and GUID . Listing 7-10 shows an example of a few different node value types. Listing 7-10. Different Node Value Types Retrieved via Casting to the Node Value s Type XElement count = new XElement("Count", 12); Console.WriteLine(count); Console.WriteLine((int)count); XElement smoker = new XElement("Smoker", false); Console.WriteLine(smoker); Console.WriteLine((bool)smoker); XElement pi = new XElement("Pi", 3.1415926535); Console.WriteLine(pi); Console.WriteLine((double)pi); And the envelope please! <Count>12</Count> 12 <Smoker>false</Smoker> False <Pi>3.1415926535</Pi> 3.1415926535 That seems very simple and intuitive. It looks like if I use the LINQ to XML API instead of the W3C DOM API, errors like the one in Listing 6-1 of the previous chapter will be a thing of the past. While all of those examples make obtaining an element s value simple, they are all cases of casting the element to the same data type that its value initially was. This is not necessary. All that is necessary is for the element s value to be able to be converted to the specified data type. Listing 7-11 shows an example where the initial data type is string, but I will obtain its value as a bool. Listing 7-11. Casting a Node to a Different Data Type Than Its Value s Original Data Type XElement smoker = new XElement("Smoker", "true"); Console.WriteLine(smoker); Console.WriteLine((bool)smoker); Since I have specified the value of the element to be "true", and since the string "true" can be successfully converted to a bool, the code works: <Smoker>true</Smoker> True

ArgumentNullException is thrown if the source argument is null. ArgumentOutOfRangeException is thrown if the index is less than zero or greater than or equal to the number of elements in the sequence.

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