XML解析器，多个根 [英] XML parser, multiple roots

问题描述

这是输入字符串的一部分，我不能修改它，它总是以这种方式（通过共享内存）来实现，但是我当然可以在将其放入字符串后进行修改：

This is part of the input string, i can't modify it, it will always come in this way(via shared memory), but i can modify after i have put it into a string of course:

<sys><id>SCPUCLK</id><label>CPU Clock</label><value>2930</value></sys><sys><id>SCPUMUL</id><label>CPU Multiplier</label><value>11.0</value></sys><sys><id>SCPUFSB</id><label>CPU FSB</label><value>266</value></sys>

我同时阅读了以下内容：

i've read it with both:

        String.Concat(
            XElement.Parse(encoding.GetString(bytes))
                .Descendants("value")
                .Select(v => v.Value));

和：

    XmlDocument document = new XmlDocument();
    document.LoadXml(encoding.GetString(bytes));
    XmlNode node = document.DocumentElement.SelectSingleNode("//value");
    Console.WriteLine("node = " + node);

，但是它们在运行时都有错误；输入有多个根（有多个根元素引用），我不想拆分字符串。

but they both have an error when run; that the input has multiple roots(There are multiple root elements quote), i don't want to have to split the string.

它们是读取字符串的任何方式是否在< value> 和< / value> 之间的值不将字符串吐入多个输入？ p>

Is their any way to read the string take the value between <value> and </value> without spiting the string into multiple inputs?

推荐答案

这不是格式正确的XML文档，因此大多数XML工具将无法对其进行处理。

That's not a well-formed XML document, so most XML tools won't be able to process it.

XmlReader 是一个例外。查找 XmlReaderSettings.ConformanceLevel 在MSDN中。如果将其设置为 ConformanceLevel.Fragment ，则可以使用这些设置创建 XmlReader 并使用它从中读取元素

An exception is the XmlReader. Look up XmlReaderSettings.ConformanceLevel in MSDN. If you set it to ConformanceLevel.Fragment, you can create an XmlReader with those settings and use it to read elements from a stream that has no top-level element.

您必须编写使用 XmlReader.Read（）的代码为此，您不能仅将其提供给 XmlDocument （确实需要有一个顶级元素）。

You have to write code that uses XmlReader.Read() to do this - you can't just feed it to an XmlDocument (which does require that there be a single top-level element).

例如

var readerSettings = new XmlReaderSettings { ConformanceLevel = ConformanceLevel.Fragment };
using (var reader = XmlReader.Create(stream, readerSettings))
{
    while (reader.Read())
    {
        using (var fragmentReader = reader.ReadSubtree())
        {
            if (fragmentReader.Read())
            {
                var fragment = XNode.ReadFrom(fragmentReader) as XElement;

                // do something with fragment
            }
        }
    }
}

这篇关于XML解析器，多个根的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！