如何从 XDocument 获取 XML 节点 [英] How to Get XML Node from XDocument

问题描述

如何使用 LINQ 从 XDocument 获取 XML 元素?

How to Get an XML Element from XDocument using LINQ ?

假设我有一个名为 XMLDoc 的 XDocument，如下所示:

Suppose I have an XDocument Named XMLDoc which is shown below:

<Contacts>
       <Node>
           <ID>123</ID>
           <Name>ABC</Name>
       </Node>
       <Node>
           <ID>124</ID>
           <Name>DEF</Name>
       </Node>
</Contacts>

XElement Contacts = from xml2 in XMLDoc.Elements("Contacts").Elements("Node")
                    where xml2.Element("ID").Value == variable
                    select xml2;

但我收到错误对象引用不是要设置......"

But I am getting Error "Object Reference is NOT to set....."

如何使用 LINQ 从 XML 文件中获取特定节点?我想更新该节点中的一些值?

How to get a particular Node from a XML file using LINQ ? And I want to update some values in that node ?

怎么可能??????

提前致谢........

Thanks in advance.........

推荐答案

test.xml:

<?xml version="1.0" encoding="utf-8"?>
<Contacts>
  <Node>
    <ID>123</ID>
    <Name>ABC</Name>
  </Node>
  <Node>
    <ID>124</ID>
    <Name>DEF</Name>
  </Node>
</Contacts>

选择单个节点:

XDocument XMLDoc = XDocument.Load("test.xml");
string id = "123"; // id to be selected

XElement Contact = (from xml2 in XMLDoc.Descendants("Node")
                    where xml2.Element("ID").Value == id
                    select xml2).FirstOrDefault();

Console.WriteLine(Contact.ToString());

删除单个节点:

XDocument XMLDoc = XDocument.Load("test.xml");
string id = "123";

var Contact = (from xml2 in XMLDoc.Descendants("Node")
               where xml2.Element("ID").Value == id
               select xml2).FirstOrDefault();

Contact.Remove();
XMLDoc.Save("test.xml");

添加新节点:

XDocument XMLDoc = XDocument.Load("test.xml");

XElement newNode = new XElement("Node",
    new XElement("ID", "500"),
    new XElement("Name", "Whatever")
);

XMLDoc.Element("Contacts").Add(newNode);
XMLDoc.Save("test.xml");

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