Question

I have an xml flow wit h this structure :

<TagNames>
  <TagName id="A1">some text...</TagName>
  <TagName id="A2">some text...</TagName>
  <TagName id="An">some text...</TagName>
</TagNames>

What’s the best way to get only one node by ‘id’ without looping the entire file ?
Linq to Sql, Xpath… I am using C#

Thanks

Answer 1

In XPath this is immediate:

"/TagNames/TagName[@id='A1']"

You can use it with XMLDocument.SelectSingleNode of System.Xml:

  XmlDocument doc = new XmlDocument();
  doc.Load("input.xml");

  XmlNode single_node;
  XmlElement root = doc.DocumentElement;
  single_node = root.SelectSingleNode("/TagNames/TagName[@id='A1']");

  Console.WriteLine(single_node.OuterXml);