xml - Powershell HasChildNodes是否适用于文本？

Question

在Powershell中使用XML对象时，如果元素只是具有文本数据而不是另一个元素，则HasChildNodes是否应返回true？有没有办法识别下面没有任何实际元素的元素？

给定下面的示例，我希望元素Parameter_Section对于有子元素将返回true，但是我不希望内部的元素在有数据的情况下也返回true。例如，SCM_Included，SendToApp和WF_Start都返回true，因为它们具有文本。定义为“获取一个值，该值指示此节点是否具有任何子节点”。这是否意味着文本或数据被视为子节点？

我正在解析一堆InfoPath XML文件，希望能够忽略诸如Parameter_Section之类的父元素，这些父元素仅用于组织(InfoPath称其为“节”)实际存储数据的子元素(InfoPath中的字段) )。

function ReadAllNodes ($node) {
foreach ($childnode in $node.ChildNodes)
{
    [string] $path = Get-XPath($childnode)
    [string] $nt = $childnode.NodeType
    [string] $hc = $childnode.HasChildNodes
    [string] $name = $childnode.Name
    [string] $val = $childnode.Value
    [string] $txt = $childnode.'#text'

    Write-Host (“Name={0}, path={1}, type={2}, hc={3}, val={4}, txt={5}” -f $name, $path, $nt, $hc,$val,$txt)
}

foreach ($cn in $childnode) {
    ReadAllNodes $cn
    }
}

$Xml = @"
<?xml version="1.0" encoding="utf-8"?>
<myFields>
    <Parameter_Section>
        <Approval_Mode />
        <SCM_Included>n</SCM_Included>
        <ApprovalCompleteDateTime />
        <ApprovalCompleteDateStr />
        <SendToApp>No</SendToApp>
        <WF_Start>0</WF_Start>
        <QuoteAttachCount>0</QuoteAttachCount>
        <TestEmail />
        <TestMessage />
        <IsCurrentUserRequestor>true</IsCurrentUserRequestor>
        <CanCurrentUserApprove>Approve</CanCurrentUserApprove>
    </Parameter_Section>
</myFields>
"@

$content = New-Object -TypeName XML
$content.LoadXml($Xml)
[System.Xml.XmlElement] $root = $content.get_DocumentElement()

ReadAllNodes $root





    Name=Parameter_Section, path=/myFields/Parameter_Section, type=Element, hc=True, val=, txt=
Name=Approval_Mode, path=/myFields/Parameter_Section/Approval_Mode, type=Element, hc=False, val=, txt=
Name=SCM_Included, path=/myFields/Parameter_Section/SCM_Included, type=Element, hc=True, val=, txt=n
Name=ApprovalCompleteDateTime, path=/myFields/Parameter_Section/ApprovalCompleteDateTime, type=Element, hc=False, val=, txt=
Name=ApprovalCompleteDateStr, path=/myFields/Parameter_Section/ApprovalCompleteDateStr, type=Element, hc=False, val=, txt=
Name=SendToApp, path=/myFields/Parameter_Section/SendToApp, type=Element, hc=True, val=, txt=No
Name=WF_Start, path=/myFields/Parameter_Section/WF_Start, type=Element, hc=True, val=, txt=0
Name=QuoteAttachCount, path=/myFields/Parameter_Section/QuoteAttachCount, type=Element, hc=True, val=, txt=0
Name=TestEmail, path=/myFields/Parameter_Section/TestEmail, type=Element, hc=False, val=, txt=
Name=TestMessage, path=/myFields/Parameter_Section/TestMessage, type=Element, hc=False, val=, txt=
Name=IsCurrentUserRequestor, path=/myFields/Parameter_Section/IsCurrentUserRequestor, type=Element, hc=True, val=, txt=true
Name=CanCurrentUserApprove, path=/myFields/Parameter_Section/CanCurrentUserApprove, type=Element, hc=True, val=, txt=Approve
Name=#text, path=/myFields/Parameter_Section/CanCurrentUserApprove/#text, type=Text, hc=False, val=Approve, txt=

Answer 1

Does that mean text or data is considered a child node?

是的，确实如此。
<CanCurrentUserApprove>节点内的字符串“Approve”本身就是 XmlText节点。如您所料，可以通过 ChildNodes属性访问文本节点。

请尝试以下示例:

$content.SelectNodes('//CanCurrentUserApprove')[0].ChildNodes[0]