Csharp/CSharp Tutorial/XML/XPathDocument

Create XPathDocument from xml file

<source lang="csharp">using System; using System.Data; using System.Xml; using System.Xml.XPath; public class MainClass {

 public static void Main() {
     XPathDocument doc = new XPathDocument( "sample.xml" );
     XPathNavigator nav = doc.CreateNavigator();
     XPathExpression xpe = nav.rupile( "//name" );
     XPathNodeIterator ni = nav.Select( xpe );
 
     while ( ni.MoveNext() ) {
         Console.WriteLine(ni.Current.Value);
     }
 }

}</source>

Navigate Xml with XPathNavigator

<source lang="csharp">using System; using System.Collections.Generic; using System.ruponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Xml; using System.Xml.XPath;

   public class MainClass
   {
       public static void Main()
       {
       XmlDocument doc = new XmlDocument();
       XPathNavigator navigator = null;
           doc.Load(Application.StartupPath + @"\employees.xml");
           navigator = doc.CreateNavigator();
           
           
           navigator.MoveToRoot();
           navigator.MoveToFirstChild();
           while (navigator.MoveToNext())
           {
               navigator.MoveToFirstChild();
               do
               {
                   string id = navigator.GetAttribute("employeeid", "");
                   if (id == "1")
                   {
                       navigator.MoveToFirstChild();
                       do
                       {
                           switch (navigator.Name)
                           {
                               case "firstname":
                                   Console.WriteLine(navigator.Value);
                                   break;
                               case "lastname":
                                   Console.WriteLine(navigator.Value);
                                   break;
                               case "homephone":
                                   Console.WriteLine(navigator.Value);
                                   break;
                               case "notes":
                                   Console.WriteLine(navigator.Value);
                                   break;
                           }
                       }
                       while (navigator.MoveToNext());
                       navigator.MoveToParent();
                   }
               }
               while (navigator.MoveToNext());
           }

           
           navigator.MoveToRoot();
           navigator.MoveToFirstChild();
           while (navigator.MoveToNext())
           {
               navigator.MoveToFirstChild();
               do
               {
                   string id = navigator.GetAttribute("employeeid", "");
                   if (id == "2")
                   {
                       navigator.MoveToFirstChild();
                       do
                       {
                           switch (navigator.Name)
                           {
                               case "firstname":
                                   navigator.SetValue("2");
                                   break;
                               case "lastname":
                                   navigator.SetValue("1");
                                   break;
                               case "homephone":
                                   navigator.SetValue("3");
                                   break;
                               case "notes":
                                   navigator.SetValue("4");
                                   break;
                           }
                       }
                       while (navigator.MoveToNext());
                       navigator.MoveToParent();
                   }
               }
               while (navigator.MoveToNext());
           }

       }
   }</source>