Question

I have a very simple XML:

<Rows>
  <Row>
    <id>1</id>
    <name>foo</name>
    <more>xyz</more>
  </Row>
  <Row>
    <id>2</id>
    <name>bar</name>
    <more>abc</more>
  </Row>
</Rows>

and need to do lots of querying on the ID, speed being really key.

Would it be more efficient loading the XML into a datatable and creating a PK on id and doing the querying on the data table?

or
Is this the most efficient Linq/Xml code?

myRows = XDocument.Parse(xmlString);               
result = myRows.Element("Rows").Elements("Row").Single(r => r.Element("id").Value == "1");
if (result != null)
    string name = result.Element("name").Value;

Edited For clarity: There are more elements than id & name.

Answer 1

Load it into a Dictionary<int, string>, assuming the id field is unique and an int:

var myRows = XDocument.Parse(xmlString);
var myDictionaryOfRows = myRows
    .Descendants("Row")
    .ToDictionary(e => int.Parse(e.Element("id").Value), 
        e => e.Element("name").Value);
Console.WriteLine(myDictionaryOfRows[1]);