Csharp/C Sharp/XML LINQ/XDocument

Create XDocument from XmlReader

 
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Data.Linq;
using System.Reflection;
using System.Xml;
using System.Xml.Linq;
class Program {
    static void Main(string[] args) {
        XmlReader reader = XmlReader.Create("Employee.xml");
        XDocument xml = XDocument.Load(reader);
        Console.WriteLine(xml);
        XElement idperson = xml.Descendants("idP").Last();
        idperson.Add(new XElement("idperson",
                        new XAttribute("id", 1),
                        new XAttribute("year", 2006),
                        new XAttribute("salary", "16")));
        StringWriter sw = new StringWriter();
        XmlWriter w = XmlWriter.Create(sw);
        xml.Save(w);
        w.Close();
        Console.WriteLine(sw.ToString());
    }
}

Creating an XML Document with XDocument

 
using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using System.Xml;
using System.Xml.Linq;
public class MainClass {
    public static void Main() {
        XDocument xDocument = new XDocument(
          new XDeclaration("1.0", "UTF-8", "yes"),
          new XDocumentType("Books", null, "Books.dtd", null),
          new XProcessingInstruction("Book", "out-of-print"),
          new XElement("Books"));
        Console.WriteLine(xDocument);
    }
}

Get Encoding, Version and standalone from XML declaration

 
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.Linq;
using System.Reflection;
using System.Xml.Linq;
class Program {
    static void Main(string[] args) {
        XDocument xml = XDocument.Load("Hello_XLINQ.xml");
        Console.WriteLine("Encoding: {0}", xml.Declaration.Encoding);
        Console.WriteLine("Version: {0}", xml.Declaration.Version);
        Console.WriteLine("Standalone: {0}", xml.Declaration.Standalone);
    }
}

Intentionally Exposing the Halloween Problem

 

using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using System.Xml;
using System.Xml.Linq;
public class MainClass {
    public static void Main() {
        XDocument xDocument = new XDocument(
          new XElement("Books",
          new XElement("Book",
          new XAttribute("type", "Author"),
          new XElement("FirstName", "J"),
          new XElement("LastName", "R")),
          new XElement("Book",
          new XAttribute("type", "Author"),
          new XElement("FirstName", "E"),
          new XElement("LastName", "B"))));
        IEnumerable<XElement> elements =
          xDocument.Element("Books").Elements("Book");
        foreach (XElement element in elements) {
            Console.WriteLine("Source element: {0} : value= {1}",element.Name, element.Value);
        }
        foreach (XElement element in elements) {
            Console.WriteLine("Removing {0}= {1} &iexcl;�", element.Name, element.Value);
            element.Remove();
        }
        Console.WriteLine(xDocument);
    }
}

Loading a Document with the XDocument.Load Method with LoadOptions

 
using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using System.Xml;
using System.Xml.Linq;
public class MainClass {
    public static void Main() {
        XDocument xDocument = XDocument.Load("book.xml",LoadOptions.SetBaseUri | LoadOptions.SetLineInfo);
        Console.WriteLine(xDocument);
        XElement firstName = xDocument.Descendants("FirstName").First();
        Console.WriteLine("FirstName Line:{0} Position:{1}",((IXmlLineInfo)firstName).LineNumber,((IXmlLineInfo)firstName).LinePosition);
        Console.WriteLine("FirstName Base URI:{0}", firstName.BaseUri);
    }
}

Query an XML document with Linq

 
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.Linq;
using System.Reflection;
using System.Xml.Linq;
class Program {
    static void Main(string[] args) {
        XDocument xml = XDocument.Load(@"Employee.xml");
        var query = from p in xml.Elements("people").Elements("person")
                    where (int)p.Element("id") == 1
                    select p;
        foreach (var record in query) {
            Console.WriteLine("Employee: {0} {1}",
                                                record.Element("firstname").Value,
                                                record.Element("lastname").Value);
        }
    }
}

Saving a Document with the XDocument.Save Method

 
using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using System.Xml;
using System.Xml.Linq;
public class MainClass {
    public static void Main() {

        XDocument xDocument = new XDocument(
         new XElement("Books",
           new XElement("Book",
           new XAttribute("type", "Author"),
           new XAttribute("experience", "first-time"),
           new XAttribute("language", "English"),
           new XElement("FirstName", "J"),
           new XElement("LastName", "R"))));
        xDocument.Save("book.xml");
    }
}

Traversing Forward from an XElement Object via the NextNode Property

 
using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using System.Xml;
using System.Xml.Linq;
public class MainClass {
    public static void Main() {
        XElement firstParticipant;
        XDocument xDocument = new XDocument(
         new XDeclaration("1.0", "UTF-8", "yes"),
         new XDocumentType("Books", null, "Books.dtd", null),
        new XProcessingInstruction("Book", "out-of-print"),
           new XElement("Books", firstParticipant =
           new XElement("Book",
           new XAttribute("type", "Author"),
       new XElement("FirstName", "J"),
         new XElement("LastName", "R")),
         new XElement("Book",
         new XAttribute("type", "Author"),
         new XElement("FirstName", "E"),
         new XElement("LastName", "B"))));
        Console.WriteLine(firstParticipant.NextNode);
    }
}

Using the LINQ to XML API to Create an XML Document and Adding Some Structure

 
using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using System.Xml;
using System.Xml.Linq;
public class MainClass {
    public static void Main() {
        XDocument xDocument =
         new XDocument(
         new XElement("Books",
         new XElement("Book",
         new XAttribute("type", "Author"),
         new XElement("FirstName", "J"),
         new XElement("LastName", "R"))));
        Console.WriteLine(xDocument.ToString());
    }
}