CSharp - Enumerate through the elements and retrieve the element's annotation:

Description

Enumerate through the elements and retrieve the element's annotation:

Demo

using System;
using System.Linq;
using System.Xml.Linq;
using System.Collections.Generic;

class Program//from w w  w .j  a  v  a 2s  . co  m
{
    static void Main(string[] args)
    {
        //  we will use this to store a reference to one of the elements in the XML tree.
        XElement firstParticipant;

        XDocument xDocument = new XDocument(
          new XElement("Books", firstParticipant =
            new XElement("Book",
              new XAttribute("type", "Author"),
              new XAttribute("experience", "first-time"),
              new XAttribute("language", "English"),
              new XElement("FirstName", "Joe"),
              new XElement("LastName", "Ruby")),
            new XElement("Book",
              new XAttribute("type", "Editor"),
              new XElement("FirstName", "PHP"),
              new XElement("LastName", "Python"))));
        //  Display the document for reference.
        Console.WriteLine(xDocument + System.Environment.NewLine);


        //  we'll add some annotations based on their type attribute.
        foreach (XElement e in xDocument.Element("Books").Elements())
        {
            if ((string)e.Attribute("type") == "Author")
            {
                AuthorHandler aHandler = new AuthorHandler();
                e.AddAnnotation(aHandler);
            }
            else if ((string)e.Attribute("type") == "Editor")
            {
                EditorHandler eHandler = new EditorHandler();
                e.AddAnnotation(eHandler);
            }
        }

        AuthorHandler aHandler2;
        EditorHandler eHandler2;
        foreach (XElement e in xDocument.Element("Books").Elements())
        {
            if ((string)e.Attribute("type") == "Author")
            {
                aHandler2 = e.Annotation<AuthorHandler>();
                if (aHandler2 != null)
                {
                    aHandler2.Display(e);
                }
            }
            else if ((string)e.Attribute("type") == "Editor")
            {
                eHandler2 = e.Annotation<EditorHandler>();
                if (eHandler2 != null)
                {
                    eHandler2.Display(e);
                }
            }
        }
    }
}

public class AuthorHandler
{
    public void Display(XElement element)
    {
        Console.WriteLine("AUTHOR BIO");
        Console.WriteLine("Name:        {0} {1}",
          (string)element.Element("FirstName"),
          (string)element.Element("LastName"));
        Console.WriteLine("Language:    {0}", (string)element.Attribute("language"));
        Console.WriteLine("Experience:  {0}", (string)element.Attribute("experience"));
    }
}

public class EditorHandler
{
    public void Display(XElement element)
    {
        Console.WriteLine("EDITOR BIO");
        Console.WriteLine("Name:        {0}", (string)element.Element("FirstName"));
        Console.WriteLine("             {0}", (string)element.Element("LastName"));
    }
}

Result

Related Topic

• Creating Elements with XElement
• Creating XElement from String value
• Creating XML Tree via XElement
• Creating XElement from LINQ statement
• Creating an Element and Assigning a String As Its Value
• Cast XElement to String
• Cast XElement to the Node Value's Type
• Cast a Node to a Different Data Type Than Its Value's Original Data Type
• Cast to a Bool Calls the System.Xml.XmlConvert.ToBoolean Method
• Use ToString Method on an Element to get XML Tree in String
• Creating a Text Node and Passing It As the Value of a Created Element
• Using Functional Construction to Create an XML
• Generating an XML Tree with a LINQ Query
• Deferred Execution of the XML Tree Construction by Using the XStreamingElement Class
• Accessing Named Child Elements Using the Elements Method
• Accessing the First Child Element with a Specified Name
• Using ReplaceAll to Change an Element's Subtree
• Accessing an Element's Child Elements Using the Elements Method
• Using the OfType Operator to Return Just the Elements
• Use LINQ to restrict the sequence of XML nodes to get comment only
• Adding a Node to the End of the Specified Node's Child Nodes with Add
• Adding a Node to the Beginning of the Specified Node's Child Nodes with AddFirst
• Adding a Node in the Specified Node's Child Nodes with AddBeforeSelf
• Adding a Node in a Specific Location of the Specified Node's Child Nodes with AddAfterSelf
• Deleting a Specific Node with Remove
• Deleting a Sequence of Nodes with Remove
• Removing a Node's Content with RemoveAll
• Updating a Node's Value
• Using SetElementValue to Update, Add, and Delete Child Elements
• Add annotations based on their type attribute

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