Ouput of script shows extra comma - powershell

Question

I have a script where the script check NIC binding order.
$result = Invoke-Command -ComputerName $ComputerName -ScriptBlock {
function Get-BindOrder {
$Binding = (Get-ItemProperty "HKLM:\SYSTEM\CurrentControlSet\Services\Tcpip\Linkage").Bind
$Return = New-Object PSobject
$BindingOrder = #()
foreach ($Bind in $Binding) {
$DeviceId = $Bind.Split("\")[2]
$Adapter = (Get-WmiObject Win32_Networkadapter | Where {$_.GUID -eq $DeviceId }).NetConnectionId
$BindingOrder += $Adapter
}
$BindingOrder
} #EndFunction
CLS
Get-BindOrder
}
$adapteresult = $result -join (",")
when I echo this $adapteresult = $result, I am getting an output as below
PS C:\> $adapteresult
vEthernet (10.211.14.0_20)
storage
Ethernet 5
Ethernet 4
Ethernet 2
Ethernet 6
The same variable when I added $adapteresult = $result -join (","), I am getting out put with extra command in between.
vEthernet (10.241.24.0_21),storage,Ethernet 5,,Ethernet 4,Ethernet 2,Ethernet 6,,
I do not want any extra comma in output. Expecting output like below:
vEthernet (10.241.24.0_21),storage,Ethernet 5,Ethernet 4,Ethernet 2,Ethernet 6,

Answer 1

(Get-WmiObject Win32_Networkadapter | Where {$_.GUID -eq $guid}).NetConnectionId appears to be returning $nulls that you are capturing in $BindingOrder. Displayed on the screen they take up no space but they are there regardless. Running a condensed version of your code locally on my machine ...
$results = ((Get-ItemProperty "HKLM:\SYSTEM\CurrentControlSet\Services\Tcpip\Linkage").Bind | Foreach-Object {
$guid = $_.split("\")[2]
(Get-WmiObject Win32_Networkadapter | Where {$_.GUID -eq $guid}).NetConnectionId
})
Using that lets look at $results:
$results
$results.Count
$results -contains $null
Local Area Connection
6
True
On my machine I only have one match for Local Area Connection. However the $results have stored 6 items at least one of which is a $null. You need to filter out these results it seems in your query.
$Adapter = (Get-WmiObject Win32_Networkadapter | Where {$_.GUID -eq $DeviceId }).NetConnectionId
if($Adapter){
$BindingOrder += $Adapter
}
Should do it. if $adapter is null or empty string then it won't be added to $bindingorder

Answer 2

I have corrected myself and its working fine now
$a = (Get-ItemProperty "HKLM:\SYSTEM\CurrentControlSet\Services\Tcpip\Linkage").Bind | ForEach-Object {
$guid = ($_ -split '\\')[2]
Get-WmiObject -Query "SELECT * FROM Win32_NetworkAdapter WHERE GUID='$guid'" |
Select-Object -ExpandProperty NetConnectionID
}
$b = $a -join","