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  • Your email address will not be published.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

  • Live Event Date: July 8, 2015 @ 2:00 p.m. ET / 11:00 a.m. PT With business driving the increasing adoption of agile methodologies such as Continuous Integration and Continuous Deployment, the need for agile database tooling has become even more important. In many companies, the database development lifecycle has become the bottleneck in an otherwise agile delivery process. As such, database professionals are under increasing pressure to shorten delivery timelines even further, only increasing the stakes …

  • Cloud computing isn't new, but it's still a hot topic in technology circles. Moving to the cloud has done great things for many businesses. When it comes to handling a basic business necessity, cloud computing has brought many improvements to overall business continuity. Using the cloud for DR makes a lot of sense for many, but it's not exactly the most simple concept. Read this eBook to find answers to all the key questions IT professionals have about cloud-based disaster recovery, and helpful info around the …

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date