Writing XML SAX Parsers in C#

Environment: C#

This project gives you a head start on writing XML parsers in C#. The important namespace to achieve our goal would be System.Xml. Though you might find it strange, unlike other languages/class libraries, there are no direct functions such as startElement and endElement at your disposal, or to come to your rescue. You will have to manage this on your own. So, let's look at this important block of code.

void ParseURL(string strUrl)
{
  try
  {
    XmlTextReader reader = new XmlTextReader(strUrl);
    while (reader.Read())
    {
      switch (reader.NodeType)
      {
        case XmlNodeType.Element:
           Hashtable attributes = new Hashtable();
           string strURI= reader.NamespaceURI;
           string strName= reader.Name;
           if (reader.HasAttributes)
           {
             for (int i = 0; i < reader.AttributeCount; i++)
             {
                reader.MoveToAttribute(i);
                attributes.Add(reader.Name,reader.Value);
             }
           }
           StartElement(strURI,strName,strName,attributes);
        break;
        //
        //you can handle other cases here
        //
        //case XmlNodeType.EndElement:
        // Todo
        //case XmlNodeType.Text:
        // Todo
        default:
        break;
      }
    }
  }
  catch (XmlException e)
  {
    Console.WriteLine("error occured: " + e.Message);
  }
}

As you can see, the main class here is XmlTextReader. XmlTextReader provides forward-only, read-only access to a stream of XML data. The current node refers to the node on which the reader is positioned. The reader is advanced by using any of the read methods and properties that reflect the value of the current node. Note that we cache the element name before we move to the attributes.

The NodeType property of XmlTextReader gets the type of the current node. Accordingly, we process the node and call necessary functions on it.

You can forward me your comments at lparam@hotmail.com.



Comments

Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • This paper introduces IBM Java on the IBM PowerLinux 7R2 server and describes IBM's implementation of the Java platform, which includes IBM's Java Virtual Machine and development toolkit.

  • As mobile devices have pushed their way into the enterprise, they have brought cloud apps along with them. This app explosion means account passwords are multiplying, which exposes corporate data and leads to help desk calls from frustrated users. This paper will discover how IT can improve user productivity, gain visibility and control over SaaS and mobile apps, and stop password sprawl. Download this white paper to learn: How you can leverage your existing AD to manage app access. Key capabilities to …

Most Popular Programming Stories

More for Developers

Latest Developer Headlines

RSS Feeds