Question

I am reading xml gps data using xmlreader.read(). I want to output all coordinate points that are not located within a line element. Below is contained within the file, and I want to exclude the coordinates listed.

<place>
  <desc>home</desc>
  <line>
      <coordinate>123,123,123</coordinate>
      <coordinate>1223,1223,22123</coordinate>
  </line>
</place>

This is an example of a valid coordinate, that I want to output and process (all located within the same file):

<place>
   <desc>home</desc>
   <point>
      <coordinate>123,123,123</coordinate>
   </point>
</place>

The difference is that one is part of a line object, and the other is a point. I currently have this code, and its grabbing everything.

            while (lxmlReader.Read())
            {

                    if (lxmlReader.NodeType == XmlNodeType.Element)
                    {
                        if (lxmlReader.Name == "coordinate")
                        {
                            rtxtOutput.Text += "\r\nElement Name: " + lxmlReader.Name.ToString();
                            rtxtOutput.Text += " Value: " + lxmlReader.ReadInnerXml().ToString();
                        }
                    }                   
            }

Answer 1

I am not sure how to do it (or if it is possible) using XmlReader – Have you considered loading the XML into an XmlDocument or XDocument object which will allow you to perform proper queries on it.

You could then do something like this:

XmlDocument doc = new XmlDocument();
doc.Load("path.xml");
foreach (XmlElement  pointCoord in doc.SelectNodes("/place/point/coordinate"))
{
    /Do something
}

You will find lots of samples of selecting nodes based on parents etc using XPath online.