根据C#中的元素值比较两个xml文档中的元素

问题描述

我试图基于相同的元素连接两个XML，但是我的代码未返回任何内容. var结果为空.有人可以帮忙解决这个问题吗?提前非常感谢！

I am trying to Join two XML based on the same elements, but my code doesn't return anything. The var result is empty. Can someone please help to sovle the problem? Many thanks in advance!

文件一:

<bookstore>
   <book>
     <bookID>100</bookID>
     <name> The cat in the hat </name>
   </book>
   <book>
    <bookID>90</bookID>
    <name> another book </name>
   </book>
   <book>
      <bookID>103</bookID>
      <name> a new book </name>
  </book>
</bookstore>

提交两个

<bookstore>
  <book>
    <bookID>100</bookID>
    <content> story </content>
  </book>
  <book>
    <bookID>90</bookID>
    <content> fiction </content>
  </book>
  <book>
    <bookID>103</bookID>
    <content> bio </content>
  </book>
 </bookstore>

我正在寻找的结果是这样的:

the result I'm looking for is something like:

<result>
    <bookInfo>
       <bookID>103</bookID>
       <name> a new book </name>
       <content> bio </content>
    <bookInfo>
 </result>

我当前使用的(错误)代码是:

The (wrong) code I am currently using is:

var reslut =
                from a in fileone.Descendants("bookstore")
                join b in filetwo.Descendants("bookstore")

            on (string)fileone.Descendants("bookID").First() equals (string)filetwo.Descendants(""bookID"").First()
            select new XElement("bookInfo", a, b);

推荐答案

您要在<bookID>子值上加入<book>元素，然后返回包含bookID，name和content元素:

You want to join <book> elements on <bookID> child value, and then return<bookInfo> elements containing bookID, name, and content elements :

var bookInfos =
        from a in fileone.Descendants("book")
        join b in filetwo.Descendants("book")
            on (string)a.Element("bookID") equals (string)b.Element("bookID")
        select new XElement("bookInfo",
                                a.Element("bookID"),
                                a.Element("name"),
                                b.Element("content")
                            );
var result = new XElement("result", bookInfos);
Console.WriteLine(result.ToString());

输出:

<result>
  <bookInfo>
    <bookID>100</bookID>
    <name> The cat in the hat </name>
    <content> story </content>
  </bookInfo>
  <bookInfo>
    <bookID>90</bookID>
    <name> another book </name>
    <content> fiction </content>
  </bookInfo>
  <bookInfo>
    <bookID>103</bookID>
    <name> a new book </name>
    <content> bio </content>
  </bookInfo>
</result>

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