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CHAPTER 21 INTRODUCTION TO LINQ
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Creating, Saving, Loading, and Displaying an XML Document
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The best way to demonstrate the simplicity and usage of the XML API is to show simple code samples. For example, the following code shows how simple it is to perform several of the important tasks required when working with XML. It starts by creating a simple XML tree consisting of a node called Employees, with two subnodes containing the names of two employees. Notice the following about the code: The tree is created with a single statement that in turn creates all the nested elements in place in the tree. This is called functional construction. Each element is created in place using an object-creation expression, using the constructor of the type of the node. After creating the tree, the code saves it to a file called EmployeesFile.xml, using XDocument s Save method. It then reads the XML tree back from the file using XDocument s static Load method, and assigns the tree to a new XDocument object. Finally, it uses WriteLine to display the structure of the tree held by the new XDocument object. using System; using System.Xml.Linq;
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// Required namespace
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class Program { static void Main( ) { XDocument employees1 = new XDocument( // Create the XML document. new XElement("Employees", // Create the root element. new XElement("Name", "Bob Smith"), // Create element new XElement("Name", "Sally Jones") // Create element ) ); employees1.Save("EmployeesFile.xml"); // Save to a file
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// Load the saved document into a new variable. XDocument employees2 = XDocument.Load("EmployeesFile.xml"); Static method Console.WriteLine(employees2); // Display document } } This code produces the following output: <Employees> <Name>Bob Smith</Name> <Name>Sally Jones</Name> </Employees>
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CHAPTER 21 INTRODUCTION TO LINQ
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Creating an XML Tree
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In the previous example, you saw that you can create an XML document in-memory by using constructors for XDocument and XElement. In the case of both constructors The first parameter is the name of the object. The second and following parameters contain the nodes of the XML tree. The second parameter of the constructor is a params parameter, and so can have any number of parameters. For example, the following code produces an XML tree and displays it using the Console.WriteLine method: using System; using System.Xml.Linq; class Program { static void Main( ) { XDocument employeeDoc = new XDocument( new XElement("Employees",
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// This namespace is required.
// Create the document. // Create the root element.
new XElement("Employee", // First employee element new XElement("Name", "Bob Smith"), new XElement("PhoneNumber", "408-555-1000") ), new XElement("Employee", // Second employee element new XElement("Name", "Sally Jones"), new XElement("PhoneNumber", "415-555-2000"), new XElement("PhoneNumber", "415-555-2001") ) ) ); Console.WriteLine(employeeDoc); } }
// Displays the document
CHAPTER 21 INTRODUCTION TO LINQ
This code produces the following output: <Employees> <Employee> <Name>Bob Smith</Name> <PhoneNumber>408-555-1000</PhoneNumber> </Employee> <Employee> <Name>Sally Jones</Name> <PhoneNumber>415-555-2000</PhoneNumber> <PhoneNumber>415-555-2001</PhoneNumber> </Employee> </Employees>
Using Values from the XML Tree
The power of XML becomes evident when you traverse an XML tree and retrieve or modify values. The main methods used for retrieving data are shown in Table 21-2. Table 21-2. Methods for Querying XML
Method Name
Nodes Elements
Class
XDocument XElement XDocument XElement XDocument XElement XElement
Return Type
IEnumerable<object> IEnumerable<XElement>
Description
Returns all the children of the current node, regardless of their type Returns all the current node s XElement child nodes, or all the child nodes with a specific name Returns the current node s first XElement child node, or the first child node with a specific name Returns all the descendant XElement nodes, or all the descendant XElement nodes with a specific name, regardless of their level of nesting below the current node Same as Descendants, but also includes the current node Returns all the ancestor XElement nodes, or all the ancestor XElement nodes above the current node that have a specific name Same as Ancestors, but also includes the current node Returns the parent node of the current node
Element
XElement
Descendants
IEnumerable<XElement>
DescendantsAndSelf Ancestors
XElement XElement
IEnumerable<XElement> IEnumerable<XElement>
AncestorsAndSelf Parent
XElement XElement
IEnumerable<XElement> XElement
CHAPTER 21 INTRODUCTION TO LINQ
Some of the important things to know about the methods in Table 21-2 are the following: Nodes: The Nodes method returns an object of type IEnumerable<object>, because the nodes returned might be of different types, such as XElement, XComment, and so on. You can use the type parameterized method OfType<type> to specify what type of nodes to return. For example, the following line of code retrieves only the XComment nodes: IEnumerable<XComment> comments = xd.Nodes().OfType<XComment>(); Elements: Since retrieving XElements is such a common requirement, there is a shortcut for expression Nodes().OfType<XElement>() the Elements method. Using the Elements method with no parameters returns all the child XElements. Using the Elements method with a single name parameter returns only the child XElements with that name. For example, the following line of code returns all the child XElement nodes with the name PhoneNumber. IEnumerable<XElement> empPhones = emp.Elements("PhoneNumber"); Element: This method retrieves just the first child XElement of the current node. Like the Elements method, it can be called with either one or no parameters. With no parameters, it gets the first child XElement node. With a single name parameter, it gets the first child XElement node of that name. Descendants and Ancestors: These methods work like the Elements and Parent methods, but instead of returning the immediate child elements or parent element, they include the elements below or above the current node, regardless of the difference in nesting level.
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