Question

I need to parse a xml file and need to join the results from node ‘driver’.
Every ‘brand’ node is unique.

Sample xml file:

<brand name = "ford">   
   <transport category="car">
      <driver name="John, Doe"/>
      <driver name="Jane, Doe"/>
    </transport>
</brand>
<brand name = "opel">
   <transport category="car">
      <driver name="Jerry, Smith"/>
      <driver name="Jeff, Perry"/>
     </transport>
</brand>

Expected result:

John, Doe - Jane, Doe
Jerry, Smith - Jeff, Perry

My code so far:

    XmlTextReader reader = new XmlTextReader(@"D:\myfile.xml");

    while (reader.Read())
    {
        if (reader.Name == "brand")
            {
                XmlReader inner =  reader.ReadSubtree();
                while (inner.Read()) ;

                if (reader.Name == "driver")
                {
                    string drvNames = reader.GetAttribute("name");
                }   
            }
    }

I can’t get the result(s) for ‘driver’.
There’s one or multiple ‘driver’ nodes.
Language C#

Answer 1

You can use Linq to Xml:

var xdoc = XDocument.Load(@"D:\myfile.xml");
var query = from t in xdoc.Descendants("transport")
            select String.Join(" - ", t.Elements("driver")
                                      .Select(e => (string)e.Attribute("name")));

---

If you can’t load whole file into memory:

XmlTextReader reader = new XmlTextReader(@"D:\myfile.xml");
List<string> result = new List<string>();

while (reader.Read())
{    
    if (reader.Name == "brand")
    {
        XmlReader inner = reader.ReadSubtree();
        List<string> names = new List<string>();

        while (inner.Read())
        {
            if (reader.Name == "driver")
                names.Add(reader.GetAttribute("name"));
        }

        if (names.Any())
            result.Add(String.Join(" - ", names));
    }
}