XML LINQ

Traversing Down from an XElement Object via the Nodes Method

Posted on by coder 
   
 

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"))));
        foreach (XNode node in firstParticipant.Nodes()) {
            Console.WriteLine(node);
        }
    }
}

Traversing Up from an XElement Object via the Parent Property

Posted on by coder 
   
 
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.Parent);

    }
}

Using SetElementValue to Update, Add, and Delete Child Elements

Posted on by coder 
   
 

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 XElement("Books", firstParticipant =
            new XElement("Book",
              new XAttribute("type", "Author"),
              new XElement("FirstName", "J"),
              new XElement("LastName", "R"))));

        Console.WriteLine(xDocument);
        firstParticipant.SetElementValue("FirstName", "Joseph");
        firstParticipant.SetElementValue("MiddleInitial", "C");
        firstParticipant.SetElementValue("LastName", null);
        Console.WriteLine(xDocument);
    }
}

Validating an XML Document

Posted on by coder 
   
 

using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using System.Xml;
using System.Xml.Schema;
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", "A"),
              new XElement("MiddleName", "Carson"),
              new XElement("LastName", "B")),
            new XElement("Book",
              new XAttribute("type", "Author"),
              new XElement("FirstName", "C"),
              new XElement("LastName", "D"))));

        Console.WriteLine(xDocument);

        XmlSchemaSet schemaSet = new XmlSchemaSet();
        schemaSet.Add(null, "bookparticipants.xsd");

        xDocument.Validate(schemaSet, (o, vea) => {
               Console.WriteLine(o.GetType().Name);
               Console.WriteLine(vea.Message);
           },true);

        foreach (XElement element in xDocument.Descendants()) {
            Console.WriteLine("Element {0} is {1}", element.Name,
              element.GetSchemaInfo().Validity);

            XmlSchemaElement se = element.GetSchemaInfo().SchemaElement;
            if (se != null) {
                Console.WriteLine(
                  "Schema element {0} must have MinOccurs = {1} and MaxOccurs = {2}{3}",
                  se.Name, se.MinOccurs, se.MaxOccurs, System.Environment.NewLine);
            } else {
                Console.WriteLine();
            }
        }
    }
}

Validating an XML Document with a Lambda Expression

Posted on by coder 
   
 

using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using System.Xml;
using System.Xml.Schema;
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("language", "English"),
            new XElement("FirstName", "A"),
            new XElement("LastName", "B")),
          new XElement("Book",
            new XAttribute("type", "Author"),
            new XElement("FirstName", "C"),
            new XElement("LastName", "D"))));
        Console.WriteLine(xDocument);

        XmlSchemaSet schemaSet = new XmlSchemaSet();
        schemaSet.Add(null, "bookparticipants.xsd");
        try {
            xDocument.Validate(schemaSet, (o, vea) => {
                     Console.WriteLine(o.GetType().Name);
                     Console.WriteLine(vea.Message);
                     throw (new Exception(vea.Message));
                 });
        } catch (Exception ex) {
            Console.WriteLine("Exception occurred: {0}", ex.Message);
        }
    }
}

Validating an XML Document with Default Validation Event Handling

Posted on by coder 
   
 

using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using System.Xml;
using System.Xml.Schema;
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", "A"),
          new XElement("MiddleInitial", "C"),
              new XElement("LastName", "B")),
            new XElement("Book",
              new XAttribute("type", "Author"),
              new XElement("FirstName", "C"),
              new XElement("LastName", "D"))));

        Console.WriteLine(xDocument);

        XmlSchemaSet schemaSet = new XmlSchemaSet();
        schemaSet.Add(null, "bookparticipants.xsd");

        try {
            xDocument.Validate(schemaSet, null);
        } catch (XmlSchemaValidationException ex) {
            Console.WriteLine("Exception occurred: {0}", ex.Message);
        }
    }
}

Creating an XSD Schema by Inferring Itfrom an XML Document

Posted on by coder 
   
 

using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using System.Xml;
using System.Xml.Schema;
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", "A"),
              new XElement("LastName", "B")),
            new XElement("Book",
              new XAttribute("type", "Author"),
              new XElement("FirstName", "C"),
              new XElement("LastName", "D"))));

        Console.WriteLine(xDocument);
        xDocument.Save("bookparticipants.xml");
        XmlSchemaInference infer = new XmlSchemaInference();
        XmlSchemaSet schemaSet = infer.InferSchema(new XmlTextReader("bookparticipants.xml"));

        XmlWriter w = XmlWriter.Create("bookparticipants.xsd");
        foreach (XmlSchema schema in schemaSet.Schemas()) {
            schema.Write(w);
        }
        w.Close();
        XDocument newDocument = XDocument.Load("bookparticipants.xsd");
        Console.WriteLine(newDocument);
    }
}