//引入命名空间
using System;
using System.IO;
using System.Xml;

public class Sample
{
  private const string filename = "sampledata.xml";

  public static void Main()
  {

     XmlTextWriter writer = new XmlTextWriter (filename, null);
     //Use indenting for readability.
     writer.Formatting = Formatting.Indented;
        
     writer.WriteComment("sample XML fragment");
    
     //Write an element (this one is the root).
     writer.WriteStartElement("bookstore");

     //Write the namespace declaration.
     writer.WriteAttributeString("xmlns", "bk", null, "urn:samples");

     writer.WriteStartElement("book");

     //Lookup the prefix and then write the ISBN attribute.
     string prefix = writer.LookupPrefix("urn:samples");
     writer.WriteStartAttribute(prefix, "ISBN", "urn:samples");
     writer.WriteString("1-861003-78");
     writer.WriteEndAttribute();     

     //Write the title.
     writer.WriteStartElement("title");
     writer.WriteString("The Handmaid's Tale");
     writer.WriteEndElement();
              
     //Write the price.
     writer.WriteElementString("price", "19.95");
     
     //Write the style element.
     writer.WriteStartElement(prefix, "style", "urn:samples");
     writer.WriteString("hardcover");
     writer.WriteEndElement();

     //Write the end tag for the book element.
     writer.WriteEndElement();

     //Write the close tag for the root element.
     writer.WriteEndElement();
             
     //Write the XML to file and close the writer.
     writer.Flush();
     writer.Close();

     //Read the file back in and parse to ensure well formed XML.
     XmlDocument doc = new XmlDocument();
     //Preserve white space for readability.
     doc.PreserveWhitespace = true;
     //Load the file
     doc.Load(filename);
    
     //Write the XML content to the console.
     Console.Write(doc.InnerXml);  
  }
}

//引入命名空间
using System;
using System.IO;
using System.Text;
using System.Xml;

public class WriteXml {
  public static void Main(string [] args) {
    XmlTextWriter writer = new XmlTextWriter(Console.Out);
    writer.Formatting = Formatting.Indented;
    writer.WriteStartDocument(true);
    writer.WriteComment("this is a comment");
    writer.WriteStartElement("root");

    writer.WriteAttributeString("id","1");
    writer.WriteStartAttribute("mynamespace", "name", "foo");
    writer.WriteString("bar");
    writer.WriteEndAttribute();

    // Write another element
    writer.WriteElementString("element1","some characters");

    writer.WriteStartElement("cdataElement");
    writer.WriteAttributeString("date",DateTime.Now.ToString());
    writer.WriteCData("< & would choke on");
    writer.WriteString("< & & & ");
    writer.WriteEndElement();

    // Write an empty element
    writer.WriteStartElement("emptyElement");
    writer.WriteEndElement();

    // Write another empty element
    writer.WriteStartElement("emptyElement","Empty");
    writer.WriteFullEndElement();

    // Write some text
    writer.WriteString("One string ");
    writer.WriteEntityRef("amp");
    writer.WriteString(" another.");

    // Close the root element
    writer.WriteEndElement();
    // End the document
    writer.WriteEndDocument();

    writer.Flush();
    writer.Close();
  }
}