如何删除非超级节点的xmlns属性在一个XDocument [英] How to remove xmlns attribute of a node other than root in an XDocument

问题描述

我用的XDocument ，试图在第一个删除的xmlns =属性内节点：

I'm using XDocument to try and remove an xmlns="" attribute on the first inner node:

<Root xmlns="http://my.namespace">
    <Firstelement xmlns="">
        <RestOfTheDocument />
    </Firstelement>
</Root>

所以，我想作为一个结果是：

So what I want as a result is:

<Root xmlns="http://my.namespace">
    <Firstelement>
        <RestOfTheDocument />
    </Firstelement>
</Root>

code

doc = XDocument.Load(XmlReader.Create(inStream));

XElement inner = doc.XPathSelectElement("/*/*[1]");
if (inner != null)
{
    inner.Attribute("xmlns").Remove();
}

MemoryStream outStream = new MemoryStream();
XmlWriter writer = XmlWriter.Create(outStream);
doc.Save(writer); // <--- Exception occurs here

问题

当试图保存文档时，我得到了以下异常：

Problem

Upon trying to save the document, I get the following exception:

在preFIX'''不能从重新定义'到' HTTP：//my.namespace 相同的开始元素标记内

The prefix '' cannot be redefined from '' to 'http://my.namespace' within the same start element tag.

这是什么意思，甚至我能做些什么来消除讨厌的的xmlns =？

What does this even mean and what can I do to remove that pesky xmlns=""?

• 我也想保持根节点的命名空间
• 我只想要那个特定的的xmlns 删除，不会再有其他的的xmlns 属性在文档中。

• I do want to keep the root node's namespace
• I only want that specific xmlns removed, there will be no other xmlns attributes in the document.

我用code的答案灵感在这个问题尝试：

I've tried using code inspired from answers on this question:

inner = new XElement(inner.Name.LocalName, inner.Elements());

在调试时，的xmlns 属性已经从它，但我得到了同样的异常。

When debugging, the xmlns attribute is gone from it but I get the same exception.

推荐答案

我觉得下面的code是你想要的。你需要把每一个元素到合适的命名空间，和的删除任何的xmlns =''属性受影响的元素。后一部分是必需的，否则的LINQ to XML基本上试图离开你的元素

I think the code below is what you want. You need to put each element into the right namespace, and remove any xmlns='' attributes for the affected elements. The latter part is required as otherwise LINQ to XML basically tries to leave you with an element of

<!-- This would be invalid -->
<Firstelement xmlns="" xmlns="http://my.namespace">

这里的code：

Here's the code:

using System;
using System.Xml.Linq;

class Test
{
    static void Main()
    {
        XDocument doc = XDocument.Load("test.xml");
        foreach (var node in doc.Root.Descendants())
        {
            // If we have an empty namespace...
            if (node.Name.NamespaceName == "")
            {
                // Remove the xmlns='' attribute. Note the use of
                // Attributes rather than Attribute, in case the
                // attribute doesn't exist (which it might not if we'd
                // created the document "manually" instead of loading
                // it from a file.)
                node.Attributes("xmlns").Remove();
                // Inherit the parent namespace instead
                node.Name = node.Parent.Name.Namespace + node.Name.LocalName;
            }
        }
        Console.WriteLine(doc); // Or doc.Save(...)
    }
}

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