xpath where子句返回0个节点

Question

我在这个xpath表达式中的where子句不起作用并且总是返回0.我无法弄清楚出了什么问题。代码在这里。 currentRelationship变量的值是＆＃39; testentity_relname。＆＃39;;

var entity = doc.SelectNodes(string.Format("//Settings/Entity[RelationshipName={0}]", currentRelationship)).Cast<XmlNode>().ToList();

XML文档看起来像这样;

<Settings>
  <AccessRightTypes>
    <AccessRightType>WriteAccess</AccessRightType>
    <AccessRightType>ShareAccess</AccessRightType>
    <AccessRightType>ReadAccess</AccessRightType>
    <AccessRightType>NoneAccess</AccessRightType>
    <AccessRightType>DeleteAccess</AccessRightType>
    <AccessRightType>CreateAccess</AccessRightType>
    <AccessRightType>AssignAccess</AccessRightType>
    <AccessRightType>AppendToAccess</AccessRightType>
    <AccessRightType>AppendAccess</AccessRightType>
  </AccessRightTypes>
  <Entity>
    <RelationshipName>testentity_relname.</RelationshipName>
    <AccessRight>ReadAccess</AccessRight>
    <AccessRight>WriteAccess</AccessRight>
  </Entity>
</Settings>

如果我使用＆＃34; //设置/实体＆＃34;的xpath表达式我确实得到了单个Entity节点。但同样，where子句不起作用。并且非常感谢信息。

Answer 1

看起来你在xpath格式字符串中的参数周围缺少单引号。

var entity = doc.SelectNodes(string.Format("//Settings/Entity[RelationshipName='{0}']", currentRelationship)).Cast<XmlNode>().ToList();