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This article mainly introduces what is the basic usage of XML in C#. It is very detailed and has certain reference value. Friends who are interested must finish it!

What is XML?

XML: extensible markup language.

The role of XML:

Plain text, strong compatibility.

The difference from HTML:

Xml: mainly used to process and store data. There is no prescribed label and can be expanded.

Html: the display and description of data. The syntax label is fixed.

XML syntax features:

Case sensitive.

There can be only one root node.

Labels appear in pairs.

Attributes are in double quotation marks.

There is no reservation label. Write what you use.

Document statement:

Note:

CDATA: original text

Xmldocument operation: class Program {static void Main (string [] args) {/ / write xml / /, build Dom object XmlDocument xmlDoc = new XmlDocument () in memory; / / add documentation description XmlDeclaration xmlDeclaration = xmlDoc.CreateXmlDeclaration ("1.0", "utf-8", "yes") XmlDoc.AppendChild (xmlDeclaration); / / add root element / / create root element XmlElement rootElement = xmlDoc.CreateElement ("school"); xmlDoc.AppendChild (rootElement); / / 3, add child elements, then add child elements to XmlElement xmlClassElement = xmlDoc.CreateElement ("class") under the rootElement node / / add the id attribute XmlAttribute attr = xmlDoc.CreateAttribute ("id") for the class element; attr.Value = "X01"; xmlClassElement.Attributes.Append (attr); rootElement.AppendChild (xmlClassElement); / / 4. Create the student node for the class. XmlElement xmlStudentElement = xmlDoc.CreateElement ("student"); / / add the sid attribute to the student element. XmlAttribute studentAttr = xmlDoc.CreateAttribute ("sid"); studentAttr.Value = "s011"; xmlStudentElement.Attributes.Append (studentAttr); xmlClassElement.AppendChild (xmlStudentElement); / / add name node to student. XmlElement xmlNameElement = xmlDoc.CreateElement ("name"); xmlNameElement.InnerText = "day"; xmlStudentElement.AppendChild (xmlNameElement); / / 2. Write the Dom object to the xml file xmlDoc.Save ("school.xml"); Console.WriteLine ("ok");}}

The above methods can be written in a loop.

Xdocument operation. Class Program {static void Main (string [] args) {/ / write the file List list = new List () through xdocument; list.Add (new Person () {Name = "Sam", Age = 18}); list.Add (new Person () {Name = "Penny", Age = 20}); / / 1, create the Dom object. XDocument xDoc = new XDocument (); XDeclaration xDec = new XDeclaration ("1.0", "utf-8", null); / / set document definition xDoc.Declaration = xDec; / / 2, create root node XElement rootElement = new XElement ("List"); xDoc.Add (rootElement) / / 3. Loop creation node for (int I = 0; I < list.Count; iTunes +) {XElement PersonElement = new XElement ("Person"); PersonElement.SetAttributeValue ("id", (I + 1). ToString ()); PersonElement.SetElementValue ("Name", list.Name) PersonElement.SetElementValue ("Age", list [I] .Age); rootElement.Add (PersonElement);} xDoc.Save ("List.xml"); Console.WriteLine ("ok");}} class Person {public string Name {get; set;} public int Age {get; set }} class Program {static void Main (string [] args) {/ / read the XML file. XDocument document = XDocument.Load ("List.xml"); XElement rootElement = document.Root; Console.WriteLine ("subscriber: {0}", rootElement.Element ("CustomerName") .value); foreach (var item in rootElement.Element ("Items"). Elements ("OrderItem") {Console.WriteLine ("Commodity name: {0}", item.Attribute ("Name"). Value) } these are all the contents of the article "what are the basic uses of XML in C#". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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