Csharp/CSharp Tutorial/XML/XmlTextReader

Copy one xml document as a sub element into another xml document

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

   static void Main(string[] args)
   {
       XmlTextWriter writer = new XmlTextWriter("C:\\xmlWriterTest.xml", null);
       writer.WriteStartDocument();

       XmlTextReader reader = new XmlTextReader(@"C:\Sample.xml");
       
       while (!reader.EOF)
       {
           writer.WriteNode(reader, false);
       }

       // Ends the document.
       writer.WriteEndDocument();
       writer.Close();
       return;
   }

}</source>

Create XmlTextReader from StringReader

<source lang="csharp">using System; using System.IO; using System.Xml; class MainClass {

 static void Main(string[] args)
 {
   //StringReader stream = new StringReader("Sample.xml");
   // Thanks for Scott R (rradjah at yahoo.ru)
       StringReader stream = new StringReader("<?xml version="1.0"?><foo></foo>");
   XmlTextReader reader = new XmlTextReader(stream);
   while (reader.Read())
   {
     //TODO -
   }
   if (reader != null)
     reader.Close();
 }

}</source>

Load xml document in XmlTextReader to XmlDocument

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

 public static void Main() 
 {
   XmlTextReader xtr = new XmlTextReader(@"c:\test.xml");
   xtr.WhitespaceHandling = WhitespaceHandling.None;
   XmlDocument xd = new XmlDocument();
   xd.Load(xtr);
   XmlNode xnodDE = xd.DocumentElement;
   ChildDisplay(xnodDE, 0);
   xtr.Close();
 }
 private static void ChildDisplay(XmlNode xnod, int level)
 {
   XmlNode xnodWorking;
   String pad = new String(" ", level * 2);
   Console.WriteLine(pad + xnod.Name + "(" + xnod.NodeType.ToString() + ": " + xnod.Value + ")");
   
   if (xnod.NodeType == XmlNodeType.Element)
   {
     XmlNamedNodeMap mapAttributes = xnod.Attributes;
     for(int i=0; i<mapAttributes.Count; i++)
     {
       Console.WriteLine(pad + " " + mapAttributes.Item(i).Name + " = " +  mapAttributes.Item(i).Value);
     }
   }
   
   if (xnod.HasChildNodes)
   {
     xnodWorking = xnod.FirstChild;
     while (xnodWorking != null)
     {
       ChildDisplay(xnodWorking, level+1);
       xnodWorking = xnodWorking.NextSibling;
     }
   }
 }

}</source>

MyTestElements(Element: )
  TestBoolean(Element: )
    #text(Text: true)

Read and write XML document

<source lang="csharp">using System; using System.Collections; using System.Data; using System.Xml;

class MainClass{

 public static void Main(){
   XmlDocument doc = new XmlDocument();
   // read 
   doc.Load( "Sample.xml" );
   Console.WriteLine(doc.OuterXml);
   // write
   XmlTextWriter tw = new XmlTextWriter( "testOut.xml", null );
 tw.Formatting = Formatting.Indented;
 tw.Indentation = 4;
 doc.Save( tw );
 tw.Close();
       
 }

}</source>

<?xml version="1.0" encoding="utf-8"?><scientists xmlns="http://tempuri.org/sample.xsd"><physicist><
name>Newton</name><discovery>gravity</discovery></physicist><chemist><name>Curie</name><discovery>ra
dioactivity</discovery></chemist><herpetologist><name>Steve Irwin</name><discovery>they bite!</disco
very></herpetologist></scientists>

Use XmlTextReader to load xml document from file

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

 public static void Main() 
 {
   XmlTextReader xtr = new XmlTextReader(@"c:\test.xml");
   xtr.WhitespaceHandling = WhitespaceHandling.None;
   XmlDocument xd = new XmlDocument();
   xd.Load(xtr);
   XmlNode xnodDE = xd.DocumentElement;
   ChildDisplay(xnodDE, 0);
   xtr.Close();
 }
 private static void ChildDisplay(XmlNode xnod, int level)
 {
   XmlNode xnodWorking;
   String pad = new String(" ", level * 2);
   Console.WriteLine(pad + xnod.Name + "(" + xnod.NodeType.ToString() + ": " + xnod.Value + ")");
   
   if (xnod.NodeType == XmlNodeType.Element)
   {
     XmlNamedNodeMap mapAttributes = xnod.Attributes;
     for(int i=0; i<mapAttributes.Count; i++)
     {
       Console.WriteLine(pad + " " + mapAttributes.Item(i).Name + " = " +  mapAttributes.Item(i).Value);
     }
   }
   
   if (xnod.HasChildNodes)
   {
     xnodWorking = xnod.FirstChild;
     while (xnodWorking != null)
     {
       ChildDisplay(xnodWorking, level+1);
       xnodWorking = xnodWorking.NextSibling;
     }
   }
 }

}</source>

MyTestElements(Element: )
  TestBoolean(Element: )
    #text(Text: true)

XmlTextReader: read and move

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

   static void Main(string[] args)
   {
   XmlTextReader reader = new XmlTextReader(@"C:\books.xml");
   if (reader.Read())
   {
     Console.WriteLine(reader.Name);
     reader.MoveToContent(); 
     Console.WriteLine(reader.Name);
   }
   }

}</source>

XmlTextReader: Skip

<source lang="csharp">using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; using System.Data.OleDb; using System.Xml; public class MainClass{

  public static void Main(){
   XmlTextReader reader = new XmlTextReader(@"C:\books.xml");
   while (reader.Read())
       {
           if (reader.Name != "bookstore")
               reader.Skip();
           else
           {    
               Console.WriteLine("Name: "+reader.Name);
               Console.WriteLine("Level of the node: " +reader.Depth.ToString());
               Console.WriteLine("Value: "+reader.Value);
           }   
       }
 }

}</source>

XmlTextWriter: Write Comment

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

   static void Main(string[] args)
   {
       XmlTextWriter writer = new XmlTextWriter("C:\\xmlWriterTest.xml", null);
       writer.WriteStartDocument();
       // Write comments
       writer.WriteComment("This program uses XmlTextWriter.");
       // Ends the document.
       writer.WriteEndDocument();
       writer.Close();
       return;
   }

}</source>

XmlTextWriter: write start element

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

   static void Main(string[] args)
   {
       XmlTextWriter writer = new XmlTextWriter("C:\\xmlWriterTest.xml", null);
       writer.WriteStartDocument();
       // Write first element
       writer.WriteStartElement("root");
       writer.WriteStartElement("r", "RECORD", "urn:record");
       // Ends the document.
       writer.WriteEndDocument();
       writer.Close();
       return;
   }

}</source>

XmlTextWriter: write string

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

   static void Main(string[] args)
   {
       XmlTextWriter writer = new XmlTextWriter("C:\\xmlWriterTest.xml", null);
       writer.WriteStartDocument();
       // Write next element
       writer.WriteStartElement("FirstName","");
       writer.WriteString("Mahesh");
       writer.WriteEndElement();
       // Ends the document.
       writer.WriteEndDocument();
       writer.Close();
       return;
   }

}</source>