XElement添加一个xmlns [英] XElement adds an xmlns

问题描述

我正在使用Linq to XML创建一个新的XML文件.我从现有的XML文件中获取文件的某些部分.我为此使用以下代码.

I'm using Linq to XML to create a new XML file. Some part of the file do I get from an existing XML file. I use the following code for this.

var v2 = new XDocument(
  new XDeclaration("1.0", "utf-16", ""),
  new XComment(string.Format("Converted from version 1. Date: {0}", DateTime.Now)),
  new XElement(ns + "keyem",
    new XAttribute(XNamespace.Xmlns + "xsd", xsd.NamespaceName),
    new XAttribute(XNamespace.Xmlns + "xsi", xsi.NamespaceName),
    new XAttribute(xsi + "schemaLocation", schemaLocation.NamespaceName),
    new XAttribute("version", "2"),
    new XAttribute("description", description),
    new XElement(ns + "layout",
      new XAttribute("type", type),
      new XAttribute("height", height),
      new XAttribute("width", width),
      settings.Root)       // XML from an existing file

问题是它在现有文件的第一个元素中添加了xmlns =".

The problem is that it adds xmlns = "" the first element from the existing file.

结果是:

<?xml version="1.0" encoding="utf-16"?>
<foo 
  xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://tempuri.org/KeyEmFileSchema.xsd KeyEmFileSchema.xsd"
  xmlns="http://tempuri.org/KeyEmFileSchema.xsd">
  <settings xmlns="">
      ...
  </settings>
</foo>

我正在读取的XML文件如下所示，但是我可以根据需要对其进行更改

The XML file I'm reading from looks like this, but I can change it if needed

<?xml version="1.0" encoding="utf-16"?>
<settings>
  <colormaps>
    <colormap color="Gray"     textcolor="Black"/>
    <colormap color="DarkGray" textcolor="White"/>
    <colormap color="Black"    textcolor="White"/>
    <colormap color="Cyan"     textcolor="Black"/>
  </colormaps>
  <macromaps>
    <macromap pattern="^@([0-9A-F]{2})\|([0-9A-F]{2})$"  replace="{ESC}$1{ESC}$2{MOUSERESET}"/>
    <macromap pattern="^\$([0-9A-F]{2})\|([0-9A-F]{2})$" replace="{USERCLICK}{ESC}$1{ESC}$2{MOUSERESET}"/>
    <macromap pattern="^\$([0-9A-F]{2})$"                replace="{USERCLICK}{ESC}$1"/>
  </macromaps>
  <keydefault color="Cyan"/>
  <groupdefault color="DarkGray"/>
</settings>

推荐答案

您正在看到此信息，因为settings元素(可能来自您的文档)不在此命名空间中.它位于default/null-uri命名空间中.

You're seeing this because the settings element (presumably coming from your document) does not live in this namespace. It lives in the default/null-uri namespace.

您需要转换输入文档以更改其名称空间.

You would need to transform your input document in order to change it's namespace.

这个经过简化的示例将您的xml文件放入另一个文档中，但是在这样做之前，它会将该xml文件中每个元素的命名空间更改为目标文档的命名空间...

This somewhat simplified example take your xml file and places it into another document but, before it does so, it changes the namespace of every element in that xml file to that of your target document...

    static void ProcessXmlFile()
    {
        XNamespace ns = "http://tempuri.org/KeyEmFileSchema.xsd/";

        // load the xml document
        XElement settings = XElement.Load("data.xml");

        // shift ALL elements in the settings document into the target namespace
        foreach (XElement e in settings.DescendantsAndSelf())
        {
            e.Name = ns + e.Name.LocalName;
        }

        // write the output document
        var file = new XDocument(new XElement(ns + "foo",
                                        settings));

        Console.Write(file.ToString());            
    }

此结果...

<foo xmlns="http://tempuri.org/KeyEmFileSchema.xsd/">
  <settings>
    <colormaps>
      <colormap color="Gray" textcolor="Black" />
      <colormap color="DarkGray" textcolor="White" />
      <colormap color="Black" textcolor="White" />
      <colormap color="Cyan" textcolor="Black" />
    </colormaps>
    <macromaps>
      <macromap pattern="^@([0-9A-F]{2})\|([0-9A-F]{2})$" replace="{ESC}$1{ESC}$2{MOUSERESET}" />
      <macromap pattern="^\$([0-9A-F]{2})\|([0-9A-F]{2})$" replace="{USERCLICK}{ESC}$1{ESC}$2{MOUSERESET}" />
      <macromap pattern="^\$([0-9A-F]{2})$" replace="{USERCLICK}{ESC}$1" />
    </macromaps>
    <keydefault color="Cyan" />
    <groupdefault color="DarkGray" />
  </settings>
</foo>

如您所见，settings元素现在与foo元素位于相同的名称空间中.这本质上是一种快速而肮脏的xml转换，显然，它不尊重您要导入的xml文档中的任何名称空间.但这可能是您所追求的，或者至少可以构成更强大的基础.

As you can see, the settings element is now in the same namespace as the foo element. This is essentially a quick and dirty xml transform, and clearly it doesn't respect any namespaces in the xml doc you're importing. But this might be what you're after, or might at least form the basis of something more robust.

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