xml错误：System.Xml.XPath.XPathException：表达式必须计算为节点集

Question

我试图在我的xml文件中找到一个节点，但出现错误（请参见标题）？

 // 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>

Answer 1

删除ID后的= ：

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

变为：

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