Determine XML Node Exists

The easiest way I can think of is to try to write the node value to a variable, and then to see if that variable is null. Here's an example with the standard bookstore xml file.

[xml]$bookstore = Get-Content .\bookstore.xmlforeach ($book in $bookstore.bookstore.book | Where-Object {$_.Type -match "novel"}) { $NodeExists = $book.author if($NodeExists){  Write-Host $book.author } else{  Write-Host 'No Author' }} 

So for your script, I would think it might be

$NodeExists = $nullforeach ($vendor in $xml.Vendors.Vendor| Where-Object  {$_.Type -match "Send"}) { $NodeExists = $vendor.EncKey if ($NodeExists) {  # Do something } else {  # something else  }}

It appears that I was using the wrong syntax for SelectSingleNode. Here is a working example.

[xml]$xml = @'<?xml version="1.0" encoding="UTF-8"?>    <!-- Vendors we will send and retreive files from Get-Send means we will get a file and send them a file Send means we will only send them a file-->    <Vendors>        <Vendor Type="Get-Send">            <Name>Vendor1</Name>                        <RemotePath>/Remote/Path1/</RemotePath>            <EncKey>pgpenc.key</EncKey>        </Vendor>        <Vendor Type="Send">            <Name>Vendor2</Name>                        <RemotePath>/Remote/Path2/</RemotePath>             <!-- This one has no EncKey -->                 </Vendor>    </Vendors>'@foreach ($vendor in $xml.Vendors.Vendor| Where-Object  {$_.Type -match "Send"}) {    $NodeExists = $vendor.SelectSingleNode("./EncKey")    if ($NodeExists -ne $null) {        write-host "EncKey is null"    }    else {       write-host "EncKey is not null"    }   }EncKey is nullEncKey is not null

Thanks everyone for your help.

Use XPath to select matching nodes. InnerText is searchable by text(). You can use where-object, or ? too; behaviour is a bit different. Without sample XML it's hard to be more precise. Use XPath like so,

[xml]$doc = @'<root><Vendors><Vendor><Type>Send</Type></Vendor><Vendor><Type>Receive</Type></Vendor></Vendors></root>'@# Xpath query will return a NodeList, even if no match is found$node1 = $doc.SelectNodes("//Vendor/Type[text() = 'Send']")$node2 = $doc.SelectNodes("//Vendor/Type[text() = 'Sent']")$node1.Count1$node2.Count0# where-object will return $null if no match is found$node1 = $doc.SelectNodes("//Vendor/Type") | ? { $_.InnerText -eq "Send" }$node2 = $doc.SelectNodes("//Vendor/Type") | ? { $_.InnerText -eq "Sent" }$node1 -eq $nullFalse$node2 -eq $nullTrue