在Powershell中访问XMLAttribute的#text属性 [英] access #text property of XMLAttribute in powershell

问题描述

我有一个格式如下的xml文档:

I have an xml document formated like this:

<root>
<obj>
   <indexlist>
      <index name="NUMD" value="val1" />
      <index name="DATE" value="val2" />
   </indexlist>
</obj>
</root>

现在，我想更改将名称设置为"DATE"的索引元素的value属性.我得到这样的属性:

now I'd like to change the value attribute of the index element where name is set to "DATE". I get the attribute like this:

$attr = $xml.selectnodes("//obj/indexlist/index[@name='DATE']/@value")

我可以通过键入以下内容来查看值:

I can view the value by typing this:

$attr.'#text'

但我无法更改:

$attr.'#text' = 'foo'
The property '#text' cannot be found on this object. Verify that the property exists and can be set.
At line:1 char:1
+ $n.'#text' = 'foo'
+ ~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : PropertyAssignmentException

如何更改XMLAttribute的值?

如果可能的话，我也想坚持使用XPath直接返回属性，因为该脚本的最终用户将使用XPath在配置文件中定义要更改的元素和属性. 还将XPath用作属性时，用户只需提供两个参数即可更改属性和future-value:XPath和value.

I'd also like to stick with XPath returning the attribute directly if that's possible because the end-user of that script will define the elements and attributes to change in a config file using XPath.
While using XPath for the attributes as well the user can simply provide the attribute to change and the future-value with just two arguments: the XPath and the value.

推荐答案

除了#text，您还可以通过Value属性访问XmlAttribute的值:

Besides #text, you can also access XmlAttribute's value via Value property :

$attr = $xml.SelectSingleNode("//obj/indexlist/index[@name='DATE']/@value")

#print old value
$attr.Value

#update attribute value 
$attr.Value = "new value"

#print new value
$attr.Value

请注意，$attr.Value中的Value是XmlAttribute的属性名称.它不受XML中名为value的属性的影响.

Note that Value in $attr.Value is property name of XmlAttribute. It doesn't affected by the fact that the attribute in your XML named value.

这篇关于在Powershell中访问XMLAttribute的#text属性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！