[英]Linq to XML query returns null
I have the following XML file:我有以下 XML 文件:
<?xml version="1.0" encoding="utf-8"?>
<tmx version="1.4">
<header/>
<body>
<tu>
<tuv lang="en">
<seg>Hello?</seg>
</tuv>
<tuv lang="es">
<seg>¿Diga?</seg>
</tuv>
</tu>
</body>
</tmx>
And I'm trying to use this code to retrieve the content of the first <seg>
tag:我正在尝试使用此代码来检索第一个
<seg>
标记的内容:
root.Elements("tuv")
.Where(e => e.Attribute("lang").Value.Equals("en"))
.Select(e => e.Elements("seg"))
.SingleOrDefault()
.Where(d => d.Value.Equals(originalText))
.SingleOrDefault()
.Value;
originaltext
equals "Hello?" originaltext
等于“你好?” in this case.在这种情况下。 However, the result given is null.
但是,给出的结果为空。 I assume my linq query is wrong.
我假设我的 linq 查询是错误的。 Could anyone give me a hint on how to write this query properly?
谁能给我一个关于如何正确编写此查询的提示? Thank you very much!
非常感谢!
The Elements
function returns a collection of the direct child elements of the root
. Elements
函数返回root
的直接子元素的集合。 You should use the Descendants
method that return the collection of all descendant elements.您应该使用返回所有后代元素集合的
Descendants
方法。
root.Descendants("tuv").Where(e => e.Attribute("lang").Value == "en")
.Select(e => e.Elements("seg")).SingleOrDefault()
.Where(d => d.Value == originalText).SingleOrDefault().Value
If you want to select the first "seg" element, do this如果要选择第一个“seg”元素,请执行此操作
var xDoc = XDocument.Parse(File.ReadAllText(@"C:\YourDirectory\sample.xml"));
var firstSeg = xDoc.Descendants("seg").First();
Code to satisfy OP's requirement in comment满足OP在评论中要求的代码
var seg = xDoc.Descendants("tuv")
.First(tuv => tuv.Attribute("lang").Value == "en")
.Element("seg")
.Value;
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