读取 XML(从字符串)并获取一些字段 - 读取 XML 时出现问题

问题描述

我有这个 XML(存储在一个名为 myXML 的 C# 字符串中)

I have this XML (stored in a C# string called myXML)

<?xml version="1.0" encoding="utf-16"?>
<myDataz xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <listS>
    <sog>
      <field1>123</field1>
      <field2>a</field2>
      <field3>b</field3>
    </sog>
    <sog>
      <field1>456</field1>
      <field2>c</field2>
      <field3>d</field3>
    </sog>
  </listS>
</myDataz>

我想浏览所有 <sog> 元素.对于他们每个人，我想打印孩子 <field1>.

and I'd like to browse all <sog> elements. For each of them, I'd like to print the child <field1>.

这是我的代码:

XmlDocument xmlDoc = new XmlDocument();
string myXML = "<?xml version="1.0" encoding="utf-16"?><myDataz xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><listS><sog><field1>123</field1><field2>a</field2><field3>b</field3></sog><sog><field1>456</field1><field2>c</field2><field3>d</field3></sog></listS></myDataz>"
xmlDoc.Load(myXML);
XmlNodeList parentNode = xmlDoc.GetElementsByTagName("listS");
foreach (XmlNode childrenNode in parentNode)
{
    HttpContext.Current.Response.Write(childrenNode.SelectSingleNode("//field1").Value);
}

但似乎我无法将字符串读取为 XML?我得到 System.ArgumentException

but seems I can't read a string as XML? I get System.ArgumentException

推荐答案

你应该使用 LoadXml 方法，而不是 Load:

You should use LoadXml method, not Load:

xmlDoc.LoadXml(myXML); 

Load 方法试图从文件中加载 xml 并从字符串中加载 LoadXml.你也可以使用 XPath:

Load method is trying to load xml from a file and LoadXml from a string. You could also use XPath:

XmlDocument xmlDoc = new XmlDocument();
xmlDoc.LoadXml(xml);

string xpath = "myDataz/listS/sog";
var nodes = xmlDoc.SelectNodes(xpath);

foreach (XmlNode childrenNode in nodes)
{
    HttpContext.Current.Response.Write(childrenNode.SelectSingleNode("//field1").Value);
} 

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