C#如何使用xpath从xml文件的dom获取文本值

C#通过xpath从dom获取文本值

using System.Xml;
  using System.Xml.XPath;
  ...
  //create initial DOM
  XmlDocument xmlDocument = new XmlDocument();
    ///   <TextDefinitions>
    ///     <TextDefinition name="DefaultDemographicText">
    ///        <Text lang="en-UK">Thanks for taking our survey.</Text>
    ///        <Text lang="fr-FR">Merci pour prendre notre apercu.</Text>
    ///     </TextDefinition>
    ///     <TextDefinition name="ExitText">
    ///        <Text lang="en-UK">Goodbye</Text>
    ///        <Text lang="fr-FR">Au revoir </Text>
    ///     </TextDefinition>
    ///   </TextDefinitions>
  xmlDocument.LoadXml("<TextDefinitions>  <TextDefinition name='DefaultDemographicText'>      <Text lang='en-UK'>Thanks for taking our survey.</Text>       <Text lang='fr-FR'>Merci pour prendre notre apercu.</Text>   </TextDefinition>   <TextDefinition name='ExitText'>       <Text lang='en-UK'>Goodbye</Text>       <Text lang='fr-FR'>Au revoir </Text>   </TextDefinition></TextDefinitions>");
  XPathNavigator xPathNavigator = xmlDocument.CreateNavigator();
  ...
   private string GetTextFromDOM(string textName,string lang) {
         string query = "string(/TextDefinitions/TextDefinition[@name='"+textName+"']/Text[@lang = '"+lang+"'])";
         string text = (string) xPathNavigator.Evaluate(query);
         if(verbose) { Util.write("GetTextFromDOM(\""+textName+"\", \""+lang+"\"): \""+text+"\""); }
         return text;
      }
   }