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This article introduces the relevant knowledge of "which classes are made up of LINQ to XML". Many people will encounter this dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Overview of LINQ to XML

XML data is more and more widely used in various practical development systems. In order to simplify the development and utilization of XML data, Microsoft's development team developed this brand-new LINQ to XML framework. As a developer, you can understand the LINQ to XML framework from the following two levels.

First of all, the LINQ to XML framework is a lightweight XML programming API. Developers can almost replace the original XML data development method by using this framework, and it is very simple to create, read and manipulate XML data in memory, such as using function construction methods to create XML trees. Secondly, the powerful functions of LINQ are integrated into the LINQ to XML framework, and developers can adopt a consistent programming method to easily manipulate and query XML data.

LINQ to XML framework

The LINQ to XML framework mainly consists of 14 classes, all of which are in the namespace System.Xml.Linq, and the relationship between these classes is shown in figure 7-1.

In figure 7-1, the top-level XObject class is an abstract class. As a base class of most classes in the LINQ to XML framework, this class is mainly used to represent nodes or attributes in the XML tree. Some methods, such as AddAnnotation (), RemoveAnnotations (), and so on, are defined to add or delete some annotation information.

At the bottom of the XObject class is the abstract subclass XNode of the XObject class, which mainly represents the abstract concepts of nodes in the XML tree, such as elements, comments, document types, processing instructions, or text nodes, and defines some methods, such as AddAfterSelf (), AddBeforeSelf (), Remove (), which are mainly used to query and operate on nodes and elements.

At the bottom of the XNode class is the abstract subclass XContainer of the XNode class, which mainly represents the nodes that contain other nodes. Based on the XNode class, some methods, such as Add (), AddFirst (), RemoveNodes () and ReplaceNodes (), are added to realize further queries and operations on nodes and elements.

It is important to note that although the XDocument class and the XElement class are at the bottom of the LINQ to XML framework class, they are the two most important classes in the LINQ to XML framework.

The XElement class is mainly used to represent a XML element, in which the Attributes (), AncestorsAndSelf (), DescendantsAndSelf () methods are added to implement the query on the specified attribute or element, while the added RemoveAll (), RemoveAttributes (), SetElementValue (), SetAttributeValue () and other methods are used to delete and update the specified attribute or element.

The XElement class, as a basic class in the LINQ to XML framework, provides a static Load () method to load the XML tree from an external resource file, or load the XML tree as a string through the static Parse () method. The XElement class also provides the Save () method to save the XML tree as a file, or to write the XML tree to System.Xml.XmlWriter through the WriteTo () method.

The XAttribute class, a subclass of the XObject class, is mainly used to represent XML properties, which define methods, such as Remove () and SetValue () methods, to delete and set specified properties.

The XDocument class, as a basic class in the LINQ to XML framework, provides a static Load () method for loading XML documents from external resource files, or loading XML documents as strings through the static Parse () method.

The XDocument class also provides a Save () method to save the XML document as a file, or to write the XML document to System.Xml.XmlWriter through the WriteTo () method.

The difference between the XDocument class and the XElement class is that the XDocument document is an XElement tree that contains a single root element, and in the XDocument document, you can also include XML declarations (XDeclaration), XML file types (XDocumentType), and XML processing hints (XProcessingInstruction).

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