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Introducing LINQ to XML
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LINQ to XML is a small, focused API that has been designed to allow programmers to work with XML in a more productive and intuitive manner.
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At the top of figure 9.2 we have the abstract XObject class. The XObject class serves as a base class for the majority of the classes within the LINQ to XML class hierarchy. It provides an AddAnnotation method for adding user-defined information, such as line numbers, to LINQ to XML objects, as well as a RemoveAnnotation for getting rid of an annotation when it s no longer desired. To retrieve annotations, XObject offers the Annotation, Annotation<T>, Annotations, and Annotations<T> axis methods. Just below XObject in the class diagram is the abstract XNode class. XNode is the base class for all LINQ to XML classes that represent element nodes. It provides common operations for updates using the imperative style such as AddAfterSelf, AddBeforeSelf, and Remove, as well as axis methods such as Ancestors, ElementsAfterSelf, ElementsBeforeSelf, NodesAfterSelf, and NodesBeforeSelf. Just below XNode in the class hierarchy is the XContainer class. XContainer is an abstract base class for all XNode objects that can contain other XNode objects. XContainer adds additional imperative update methods such as Add, AddFirst, RemoveNodes, and ReplaceNodes. It also adds axis methods such as Nodes, Descendants, Element, and Elements. XContainer serves as the base class of two of the most important classes within the LINQ to XML hierarchy, XElement and XDocument. Although it appears low in the class hierarchy, the most fundamental class within LINQ to XML is XElement. The XElement class represents XML element nodes that contain other elements as child nodes. It adds further axis methods such as Attributes, AncestorsAndSelf, and DescendantAndSelf, as well as additional imperative update methods such as RemoveAll, RemoveAttributes, SetElementValue, and SetAttributeValue. As the fundamental class within LINQ to XML, XElement also provides a static Load method, which allows XML to be loaded from external sources, as well as a static Parse method that allows an XElement to be created from a string of XML. Finally, XElement offers a Save method for saving the XML tree that it represents to disk, as well as a WriteTo method that allows the XML to be written to an XmlWriter. In addition to being able to contain other XNode objects, XElement also has the ability to have attributes assigned. The XAttribute class represents attributes within LINQ to XML. Unlike many of the other core classes within LINQ to XML, XAttribute does not inherit from XNode. XAttribute objects are name/value pairs that are associated with XElement objects. The XAttribute class provides a Parent axis property, as well as a single imperative Remove method.
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LINQ to XML class hierarchy
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As we mentioned earlier in this chapter, the importance of XML documents has been greatly deemphasized in LINQ to XML, but they re still needed from time to time. It s for this purpose that LINQ to XML provides the XDocument class. The XDocument class represents a complete XML document. Like the XElement class, it offers both a static Load method for loading XML documents from external sources and a static Parse method that allows XML documents to be created from a string. It also offers the same Save and WriteTo methods that allow the actual XML document that they represent to be saved. The primary difference between the XElement and XDocument classes is that an XDocument contains a single root XElement, as well as the ability to contain
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One XML declaration One XML document type
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As mentioned earlier, one of the key concepts of LINQ to XML is the simplification of XML names. The two classes that help with this simplification are the XName and XNamespace classes. XName represents a fully expanded name for an XElement or XAttribute. The fully expanded name is represented in the string format {namespace}localname. The XNamespace class represents the namespace portion of an XName, and as such can be retrieved using the Namespace property of an XName. The XName and XNamespace classes have an implicit operator overload defined that allows a string formatted in expanded XML Name format to automatically be converted into an XName and XNamespace. The implicit overloads allow us to use strings in place of XName and XNamespace objects when constructing XElement and XAttribute objects. While there are several other classes within the LINQ to XML hierarchy, they re complementary classes that you likely won t see in your everyday programming efforts. See table 9.1.
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Table 9.1 Complementary LINQ to XML classes Class XDeclaration Description Represents an XML declaration. An XML declaration is used to declare the XML version, the encoding, and whether or not the XML document is standalone. Represents an XML comment. Represents an XML DTD.
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