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As you may recall, in the LINQ to Objects API, there are a handful of Standard Query Operators that exist for the purpose of making sequence set-type comparisons. I am referring to the Distinct, Except, Intersect, Union, and SequenceEqual operators. Each of these operators performs a set operation on two sequences. For each of these set-type operators, determining sequence element equality is necessary to perform the appropriate set operation. These operators perform element comparisons by calling the GetHashCode and Equals methods on the elements. For a DataRow, this results in a reference comparison, which is not the desired behavior. This will result in the incorrect determination of element equality, thereby causing the operators to return erroneous results. Because of this, each of these operators has an additional prototype that I omitted in the LINQ to Objects chapters. This additional prototype allows an IEqualityComparer object to be provided as an argument. Conveniently, a comparer object has been provided for us specifically for these versions of the operators,

// A document with one book participant. XDocument xDocument = new XDocument( new XElement("BookParticipants", new XElement("BookParticipant", new XAttribute("type", "Author"), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")))); xDocument.Element("BookParticipants").Add( new XElement("BookParticipant", new XAttribute("type", "Editor"), new XElement("FirstName", "Ewan"), new XElement("LastName", "Buckingham"))); Console.WriteLine(xDocument); In the previous code, you can see we start with the base code and then add a BookParticipant element to the document s BookParticipants element. You can see we use the Element method of the document to obtain the BookParticipants element and add the element to its child nodes using the Add method. This causes the newly added element to be appended to the child nodes: <BookParticipants> <BookParticipant type="Author"> <FirstName>Joe</FirstName> <LastName>Rattz</LastName> </BookParticipant> <BookParticipant type="Editor"> <FirstName>Ewan</FirstName> <LastName>Buckingham</LastName> </BookParticipant> </BookParticipants> The Add method adds the newly constructed BookParticipant element to the end of the BookParticipants element s child nodes. As you can see, the Add method is every bit as flexible as the XElement constructor and follows the same rules for its arguments, allowing for functional construction.

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Summary

XContainer.AddFirst()

<BookParticipants> <BookParticipant type="Author"> <!--Author of Pro LINQ: Language Integrated Query in C# 2008.--> <FirstName>Joey</FirstName> <LastName>Rattz, Jr.</LastName> </BookParticipant> </BookParticipants> As you can see, all of the node s values are updated.

To add a node to the beginning of a node s child nodes, use the AddFirst method. Using the same code as before, except calling the AddFirst method, gives you the code in Listing 7-64.

XDocumentType.Name, XDocumentType.PublicId, XDocumentType.SystemId, and XDocumentType.InternalSubset on XDocumentType Objects

This chapter discussed how you can use Ajax to fetch data and how you can leverage the JSF managed bean facility as a data source. The chapter also covered the different XMLHttpRequest response types responseText and responseXML that you can use to return the result from the server. We also showed you how to use the eval() function to efficiently parse JSON-syntax responses.

// A document with one book participant. XDocument xDocument = new XDocument( new XElement("BookParticipants", new XElement("BookParticipant", new XAttribute("type", "Author"), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")))); xDocument.Element("BookParticipants").AddFirst( new XElement("BookParticipant", new XAttribute("type", "Editor"), new XElement("FirstName", "Ewan"), new XElement("LastName", "Buckingham"))); Console.WriteLine(xDocument); As one would expect, the newly added BookParticipant element will be added to the head of the BookParticipants element s child nodes: <BookParticipants> <BookParticipant type="Editor"> <FirstName>Ewan</FirstName> <LastName>Buckingham</LastName> </BookParticipant> <BookParticipant type="Author"> <FirstName>Joe</FirstName> <LastName>Rattz</LastName> </BookParticipant> </BookParticipants> Can XML manipulation get any easier than this We submit that it cannot.

To update a document type node, the XDocumentType class provides four properties for updating its values. Listing 7-71 is some sample code demonstrating this. Listing 7-71. Updating the Document Type // I will use this to store a reference to the DocumentType for later access. XDocumentType docType; XDocument xDocument = new XDocument( docType = new XDocumentType("BookParticipants", null, "BookParticipants.dtd", null), new XElement("BookParticipants")); Console.WriteLine("Before updating document type:"); Console.WriteLine(xDocument); docType.Name = "MyBookParticipants"; docType.SystemId = "http://www.somewhere.com/DTDs/MyBookParticipants.DTD"; docType.PublicId = "-//DTDs//TEXT Book Participants//EN"; Console.WriteLine("After updating document type:"); Console.WriteLine(xDocument); Here are the results of this code: Before updating document type: <!DOCTYPE BookParticipants SYSTEM "BookParticipants.dtd"> <BookParticipants /> After updating document type: <!DOCTYPE MyBookParticipants PUBLIC "-//DTDs//TEXT Book Participants//EN" "http://www.somewhere.com/DTDs/MyBookParticipants.DTD"> <BookParticipants />

XNode.AddBeforeSelf()

To insert a node into a node s list of child nodes in a specific location, obtain a reference to either the node before or the node after where you want to insert, and call either the AddBeforeSelf method or the AddAfterSelf method.

XProcessingInstruction.Target on XProcessingInstruction Objects and XProcessingInstruction.Data on XProcessingInstruction Objects

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