Add content to csv with Add-Member - powershell

Question

I've got a csv export from Active Directory which looks like this:
Name,"GivenName","Surname","Department","LogonWorkstations"
jdoe,"John","Doe","Finance","pc1"
fbueller,"Ferris","Bueller","Sales","pc2"
Now I want to search on each Workstation, check if a folder exists and write that information back into the csv.
$input = Import-Csv "C:\Scripts\input.csv"
ForEach ($line in $input) {
$wst = $line.LogonWorkstations
If ($wst -ne "") {
If (Test-Connection $wst -Count 1 -Quiet -ErrorAction SilentlyContinue) {
If (Test-Path "\\$wst\c$\Program Files\xyz" -ErrorAction SilentlyContinue) {
Add-Member -InputObject $line -NotePropertyName "xyz" -NotePropertyValue "exists"
}
}
}
}
$input | Export-Csv "C:\Scripts\output.csv" -NoTypeInformation -Encoding Unicode
As you can see in the code, Add-Member adds the additional information to $input, however the information isn't available after exporting it to csv.

Answer 1

It works. The problem is with If conditions.
$input = Import-Csv "C:\Scripts\input.csv"
ForEach ($line in $input) {
Add-Member -InputObject $line -NotePropertyName "xyz" -NotePropertyValue "exists"
}
$input # here I get the information
$input | Export-Csv "C:\Scripts\output.csv" -NoTypeInformation -Encoding Unicode
I recommend to move Add-Member invocation as first command in the loop with default value (probably empty) then set the value in the condition.
ForEach ($line in $input)
{
Add-Member -InputObject $line -NotePropertyName "xyz" -NotePropertyValue $null
$wst = $line.LogonWorkstations
If ($wst -ne "")
{
If (Test-Connection $wst -Count 1 -Quiet -ErrorAction SilentlyContinue)
{
If (Test-Path "\\$wst\c$\Program Files\xyz" -ErrorAction SilentlyContinue)
{
$line.xyz = 'exists'
}
}
}
}

Answer 2

you add the new member to the variable $line and expect it is written back to $input .. which is not.
try this:
$input = Import-Csv "C:\Scripts\input.csv"
$counter=0
ForEach ($line in $input) {
$wst = $line.LogonWorkstations
If ($wst -ne "") {
If (-not ( Test-Connection $wst -Count 1 -Quiet -ErrorAction SilentlyContinue)) {
If (-not (Test-Path "\\$wst\c$\Program Files\xyz" -ErrorAction SilentlyContinue)) {
Add-Member -InputObject $input[$counter] -NotePropertyName "xyz" -NotePropertyValue "exists"
}
}
}
$counter++
}
$input # here I get the information
$input | Export-Csv "C:\Scripts\output.csv" -NoTypeInformation -Encoding Unicode
I changed the InputObject-Parameter to write the new member to the input variable.

Answer 3

I would recommend using a calculated property for this kind of modification:
Import-Csv "C:\Scripts\input.csv" |
Select-Object *, #{n='xyz';e={
$wst = $_.LogonWorkstations
if ($wst) {
if (Test-Connection $wst -Count 1 -Quiet -EA SilentlyContinue) {
$path = "\\$wst\c$\Program Files\xyz"
[bool](Test-Path $path -EA SilentlyContinue)
}
}
}} |
Export-Csv 'C:\Scripts\output.csv' -NoType -Encoding Unicode