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</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 we will also print out the node cast to a string.

s Note IoC means you have registered some part of your code with the framework, and the framework will

Listing 7-49. Using the OfType Operator to Return Just the Comments XElement firstParticipant; // A full document with all the bells and whistles. XDocument xDocument = new XDocument( new XDeclaration("1.0", "UTF-8", "yes"), new XDocumentType("BookParticipants", null, "BookParticipants.dtd", null), new XProcessingInstruction("BookCataloger", "out-of-print"), // Notice on the next line that I am saving off a reference to the first // BookParticipant element. new XElement("BookParticipants", firstParticipant = new XElement("BookParticipant", new XComment("This is a new author."), new XProcessingInstruction("AuthorHandler", "new"), new XAttribute("type", "Author"), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")), new XElement("BookParticipant", new XAttribute("type", "Editor"), new XElement("FirstName", "Ewan"), new XElement("LastName", "Buckingham")))); foreach (XNode node in firstParticipant.Nodes().OfType<XComment>()) { Console.WriteLine(node); } Here is the output:

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XElement name = new XElement("Name", "Joe"); Console.WriteLine(name); Console.WriteLine((string)name); Here are the results of this code: <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.

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

Just to be anticlimactic, can you use the OfType operator to get just the attributes No, you cannot. This is a trick question. Remember that unlike the W3C XML DOM API, with the LINQ to XML API, attributes are not nodes in the XML tree. They are a sequence of name-value pairs hanging off the element. To get to the attributes of the first BookParticipant node, I would change the code to that in Listing 7-50. Listing 7-50. Accessing an Element s Attributes Using the Attributes Method XElement firstParticipant; // A full document with all the bells and whistles. XDocument xDocument = new XDocument( new XDeclaration("1.0", "UTF-8", "yes"), new XDocumentType("BookParticipants", null, "BookParticipants.dtd", null), new XProcessingInstruction("BookCataloger", "out-of-print"), // Notice on the next line that I am saving off a reference to the first // BookParticipant element. new XElement("BookParticipants", firstParticipant = new XElement("BookParticipant", new XComment("This is a new author."), new XProcessingInstruction("AuthorHandler", "new"),

That seems very simple and intuitive. If we 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. Although 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 we will obtain its value as a bool.

call this code when the client requests it. This is also referred to as the Hollywood principle. ( Don t call us. We ll call you. )

new XAttribute("type", "Author"), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")), new XElement("BookParticipant", new XAttribute("type", "Editor"), new XElement("FirstName", "Ewan"), new XElement("LastName", "Buckingham")))); foreach (XAttribute attr in firstParticipant.Attributes()) { Console.WriteLine(attr); } Notice I had to change more than just the property or method of the first BookParticipant element that I was accessing. I also had to change the enumeration variable type to XAttribute, because XAttribute doesn t inherit from XNode. Here are the results:

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