xml error:System.Xml.XPath.XPathException: Expression must evaluate to a node-set

Question

I am trying to find a node in my xml file but getting the error ( see title)?

 // instantiate XmlDocument and load XML from file
        XmlDocument doc = new XmlDocument();
        doc.Load(@"C:\temp\test2.xml");
        var  node = doc.SelectSingleNode("/Offers/Offer/ID=[text()='1']");
        var test = node;

xml

<?xml version="1.0" encoding="utf-8"?>
<Offers>
  <Offer>
    <Model>AAAA</Model>
    <ID>1</ID>
    <Name>First offer</Name>
  </Offer>
  <Offer>
    <Model>BBBB</Model>
    <ID>2</ID>
    <Name>Second offer</Name>
  </Offer>
  </Offers>

It's a pretty poor error message because your XPath expression is syntactically invalid, it should be a syntax error not a type error. — Michael Kay, Jun 28 '13 at 08:22

score 2 · Accepted Answer · answered Jun 28 '13 at 02:12

2

Remove the = after ID:

 var  node = doc.SelectSingleNode("/Offers/Offer/ID=[text()='1']");

becomes:

 var  node = doc.SelectSingleNode("/Offers/Offer/ID[text()='1']");

answered Jun 28 '13 at 02:12

Gauthier Boaglio

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ok if I want to change the Name node in here how to do that? by using the ID key – user603007 Jun 28 '13 at 02:40
1

`doc.SelectSingleNode("/Offers/Offer/ID[text()='1']").NextSibling.InnerText = "new text";` - should do the job. – Gauthier Boaglio Jun 28 '13 at 02:52
1

`doc.SelectSingleNode("/Offers/Offer/ID[text()='1']").ParentNode.SelectSingleNode("Name").InnerText = "new text";` – Gauthier Boaglio Jun 28 '13 at 03:07

xml error:System.Xml.XPath.XPathException: Expression must evaluate to a node-set

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