在尝试获取值时，表达式必须评估为 Xpath 错误中设置的节点 [英] Expression must evaluate to node set in Xpath error while trying to get value

问题描述

我在尝试获取具有 Home 和 Auto 值的节点时出错.任何帮助表示赞赏.

I am getting error while trying to get nodes which has value of Home and Auto. Any help is appreciated.

XElement coverage = vehicle.XPathSelectElement("s0:VehicleCoverage/s0:Coverages/[CoverageLimitName=('Auto' |'Home')]", namespaceManager);

我喜欢获取

<Coverages>
  <Coverage>
    <CoverageLimitName>Home</CoverageLimitName>
    <OptionalCode1>WY</OptionalCode1>
    <OptionalCode2>Bodily Injury</OptionalCode2>
    </CoverageLimitValue>
    <Premium>166.00</Premium>
  </Coverage>
  <Coverage>
    <CoverageLimitName>Auto</CoverageLimitName>
    <CoverageLimitValue>
      <OptionalCode1>T</OptionalCode1>
      <OptionalCode2>Property Damage</OptionalCode2>
    </CoverageLimitValue>
    <Premium>88.00</Premium>
  </Coverage>
  <Coverage>
  </Coverage>
  ....
  </Coverage>
</Coverages>

我只想使用 xpath，并希望在 CoverageLimitName 为 home 和 auto 时获取整个覆盖率标签

I would like to use xpath only and would like to fetch entire coverage tag when it has CoverageLimitName as home and auto

推荐答案

我的猜测是您需要以下内容:

My educated guess is that you want the following:

/s0:VehicleCoverage/s0:Coverages/s0:Coverage[s0:CoverageLimitName = 'Auto' or s0:CoverageLimitName = 'Home']

对于您显示的文档，将返回两个 Coverage 元素.(假设命名空间得到了妥善处理.)

Which, for the document you show, would return both Coverage elements. (Given that the namespaces are properly dealt with.)

我们不得不猜测，因为您的示例 XML 文档缺少命名空间声明，而且您没有告诉我们您究竟要寻找什么.

We have to guess because your sample XML document lacks a namespace declaration and because you did not tell us what exactly you are looking for.

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