Not able to Get the Last node of an xml node properly - powershell

Question

I am having 2 diffrent xml file with. Currently im trying to get the Last xml node. In the 1st ouput im getting because empty or Null value since i have a commented line. Please help how to handle in this case.
#Below line Run firstfile.xml
$xmlfile = 'C:\Programs\MyTasks\TCPROD-29658\Test_1309\D_SimulationTest\firstfile.xml'
#Below line to Run secondfile.xml
#$xmlfile = 'C:\Programs\MyTasks\TCPROD-29658\Test_1309\D_SimulationTest\secondfile.xml'
$xmllastsitenode = [xml]::new()
$xmllastsitenode.Load($xmlFile)
$lastsite_id = $xmllastsitenode.fccconfig.fccdefaults.LastChild.id
write-host 'Print1'
write-host $lastsite_id
if (!$lastsite_id) { Write-Host "variable is null" }
if ($lastsite_id) { Write-Host "variable is NOT null" }
write-host 'Print2'
Below is the xml files im trying to run
1st XML file
<?xml version="1.0" encoding="UTF-8"?>
<fccconfig version="1.3.2">
<fccdefaults>
<property name="CacheLocation" value="C:/Users/Public/" overridable="true"/>
<site id="-1940805554" overridable="true">
<parentfsc address="http://abcdefgh:1234/" priority="0" />
</site>
<!--__ANT_MARK__-->
</fccdefaults>
<!-- default parentfsc - this is a marker that will be overwritten by the installer -->
<parentfsc address="xyzlmnopq:10010" priority="0" transport="lan"/>
</fccconfig>
Output:-
Print1
variable is null
Print2
2nd XML file
<?xml version="1.0" encoding="UTF-8"?>
<fccconfig version="1.3.2">
<fccdefaults>
<property name="CacheLocation" value="C:/Users/Public/" overridable="true"/>
<site id="-1940805554" overridable="true">
<parentfsc address="http://abcdefgh:1234/" priority="0" />
</site>
</fccdefaults>
<!-- default parentfsc - this is a marker that will be overwritten by the installer -->
<parentfsc address="xyzlmnopq:10010" priority="0" transport="lan"/>
</fccconfig>
Output:-
Print1
-1940805554
variable is NOT null
Print2
Latest Code which have tried meantime
#Below line Run firstfile.xml
$xmlfile = 'C:\Programs\MyTasks\TCPROD-29658\Test_1309\D_SimulationTest\firstfile.xml'
#Below line to Run secondfile.xml
#$xmlfile = 'C:\Programs\MyTasks\TCPROD-29658\Test_1309\D_SimulationTest\secondfile.xml'
$xmllastsitenode = [xml]::new()
$xmllastsitenode.Load($xmlFile)
$lastsite_id = $xmllastsitenode.fccconfig.fccdefaults.LastChild.id
write-host 'Print1'
write-host $lastsite_id
if (!$lastsite_id)
{
Write-Host "variable is null"
# New logic to handle firt xml file cases
#$somesitetag ---> Having some xml tag content here
$newSiteNode = $xmlcontent.ImportNode($somesitetag, $true)
$antmarkline = (Get-Content $xmlfile) | select-string -Pattern $antmark
$xmlcontent.fccconfig.fccdefaults.InsertAfter($newSiteNode,$antmarkline)
}
if ($lastsite_id)
{
Write-Host "variable is NOT null"
#Insterting some new nodes
#This Working as second file conetent works here
}
write-host 'Print2'

Answer 1

You need to ignore the comments. Check the output of this for the first XML file.
$settings = [System.Xml.XmlReaderSettings]::new()
$settings.IgnoreComments = $true
$xmlreader = [System.Xml.XmlReader]::Create('./Desktop/Test.xml', $settings)
$xmldoc = [System.Xml.XmlDocument]::new()
$xmldoc.Load($xmlreader)
$xmldoc.fccconfig.fccdefaults.LastChild