如何在 PowerShell 中为 XML 添加子元素 [英] How to add a child element for XML in PowerShell
问题描述
我正在尝试为此 xml 创建一个子 XML 元素:
I'm trying to create a child XML element for this xml:
<?xml version="1.0" encoding="utf-8"?>
<configuration>
</configuration>
我使用这个 PowerShell 脚本:
I use this PowerShell script:
[xml] $doc = Get-Content($filePath)
$child = $doc.CreateElement("newElement")
$doc.configuration.AppendChild($child)
我有一个错误:方法调用失败,因为 [System.String] 不包含名为的方法'AppendChild'.
推荐答案
如果您使用点表示法来导航 XML 文件(例如 $doc.configuration
),Powershell 会尝试巧妙地了解它的内容返回.
If you use dot notation to navigate an XML file (e.g. $doc.configuration
), Powershell tries to be clever about what it returns.
- 如果目标元素为空或只包含一个文本节点,PS 将返回一个
String
. - 如果目标元素包含文本节点以外的子节点,它将返回一个
XmlElement
. - 如果存在多个目标元素,它将返回一个
Object[]
,其中每个单独的数组元素再次受这些规则的约束,例如取决于其内容,它将是String
或XmlElement
. - 如果目标元素不存在,PS返回
$null
.
- If the target element is empty or only contains a single text node, PS will return a
String
. - If the target element contains child nodes other than text nodes, it will return an
XmlElement
. - If multiple target elements exist, it will return an
Object[]
, where each individual array element is again subject to these rules, e.g. it will either be aString
or anXmlElement
depending on its contents. - If the target element does not exist, PS returns
$null
.
就您而言,这很容易,因为您想将节点附加到文档元素:
In your case it's easy since you want to append nodes to the document element:
$doc = New-Object System.Xml.XmlDocument
$doc.Load($filePath)
$child = $doc.CreateElement("newElement")
$doc.DocumentElement.AppendChild($child)
但您可以使用 $doc.SelectNodes()
或 $doc.SelectSingleNode()
来浏览 XML 文档并始终返回一个节点/节点列表.
but you could use $doc.SelectNodes()
or $doc.SelectSingleNode()
to navigate around the XML document and always have a node/node list returned.
人们可能会争论这种行为的敏感性,但事实上,它使使用(结构合理的)XML 变得非常简单——例如,从配置文件或 API 响应中读取值等任务.这就是这个简单语法的目的.
One could argue about the sensibility of this behavior, but as a matter of fact it makes consuming (sanely structured) XML quite straight-forward - for example tasks such as reading values from a config file, or from an API response. That's the purpose of this simple syntax.
它不是用于创建 XML 的好工具,这是一项更复杂的任务.从一开始就使用 DOM API 方法是这里更好的方法.
It's not a good tool for creating XML, which is a more complex task. Using DOM API methods from the start is the better approach here.
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