在C#中获取具有特定属性值的xml元素 [英] Get a xml element with specific attribute value in c#

问题描述

我需要获取一个SubTopic元素的值，该元素具有一个名为名称"的属性，具有特定值.我是这样做的；

I need to get a value of a SubTopic element which has an attribute called "Name" with specific value. I do it this way;

 IEnumerable<XElement> list =
        (from el in xdoc.Elements()
         where (string)el.Attribute("Name") == "creatingTests"
         select el);

该集合具有零个元素.

我尝试放置 xdoc.Elements("SubTopic")而不是空参数，但是没有成功.

I tried putting xdoc.Elements("SubTopic") instead of empty parameter, but with no success.

我的XML文件结构；

My XML file structure;

<?xml version="1.0" encoding="windows-1250" ?>
   <Help Title="TestTool - tematy pomocy">
     <Topic Name="creatingTests" Title="Tworzenie testów">
       <SubTopic Name="saveload" Title="Zapis i odczyt z pliku">
          Content
       </SubTopic>
     </Topic>
   </Help>

如何获得Help/Topic(Name ="creatingTests")的值?

How can I get that value of Help/Topic(Name="creatingTests")?

xdoc 当然是带有已加载xml的 XDocument 对象，它确实具有我文件的内容.

xdoc is of course XDocument object with loaded xml and it does have the content of my file.

推荐答案

xdoc.Elements()仅返回一个元素-XML树的根(它是< Help> 元素在您的示例中.

xdoc.Elements() returns only one element - the Root of XML tree (it's <Help> element in your example.

将查询更改为:

IEnumerable<XElement> list =
    (from el in xdoc.Root.Elements()
     where (string)el.Attribute("Name") == "creatingTests"
     select el);

它返回一个元素的集合.使用 First 或 FirstOrDefault 将其作为单个项目而不是集合获取:

It returns collection with one element. Use First or FirstOrDefault to get it as single item, not a collection:

XElement item = (from el in xdoc.Root.Elements()
                 where (string)el.Attribute("Name") == "creatingTests"
                 select el).FirstOrDefault();

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