I'm saving 2-dimensional coordinates on an XML file with a structure similar to:
<?xml version="1.0" encoding="utf-8" ?>
<grid>
<coordinate time="78">
<initial>540:672</initial>
<final>540:672</final>
</coordinate>
</grid>
I can open the XML file and read it via the XmlTextReader, but how do I loop through the coordinates specifically to retrieve both the time attribute and data between the initial and final nodes in some format similar to:
string initial = "540:672";
string final = "540:672";
int time = 78;
My New Code:
//Read the XML file.
XDocument xmlDoc = XDocument.Load("C:\\test.xml");
foreach (var coordinate in xmlDoc.Descendants("coordinate"))
{
this.coordinates[this.counter][0] = coordinate.Attribute("time").Value;
this.coordinates[this.counter][1] = coordinate.Element("initial").Value;
this.coordinates[this.counter][2] = coordinate.Element("final").Value;
this.counter++;
};
but now I get this error:
"Object reference not set to an instance of an object."
XML
<?xml version="1.0" encoding="utf-8"?>
<grid>
<coordinate time="62">
<initial>540:672</initial>
<final>540:672</final>
</coordinate>
...
<coordinate time="46">
<initial>176:605</initial>
<final>181:617</final>
</coordinate>
</grid>
Skipped a few coordinate tags to fit, but they all had the time attribute and initial/final subtags.
Globals
uint counter = 0;
// Coordinates to be retrieved from the XML file.
string[][] coordinates;
You might want to check into something like Linq-to-XML:
XDocument coordinates = XDocument.Load("yourfilename.xml");
foreach(var coordinate in coordinates.Descendants("coordinate"))
{
string time = coordinate.Attribute("time").Value;
string initial = coordinate.Element("initial").Value;
string final = coordinate.Element("final").Value;
// do whatever you want to do with those items of information now
}
That should be a lot easier than using straight low-level XmlTextReader....
See here or here (or a great many other places) for introductions to Linq-to-XML.
UPDATE:
please try this code - if it works, and you get all the coordinates in that resulting list, then the Linq-to-XML code is fine:
Define a new helper class:
public class Coordinate
{
public string Time { get; set; }
public string Initial { get; set; }
public string Final { get; set; }
}
and in your main code:
XDocument xdoc = XDocument.Load("C:\\test.xml");
IEnumerable<XElement> cords= xdoc.Descendants("coordinate");
var coordinates = cords
.Select(x => new Coordinate()
{
Time = x.Attribute("time").Value,
Initial = x.Attribute("initial").Value,
Final = x.Attribute("final").Value
});
How does this list and its contents look like?? Do you get all the coordinates you're expecting??