Incrementing variables in powershell - powershell

Question

I'm new to PowerShell and am trying to create a script that goes through a csv file (simple name,value csv) and loads each new line in it as a variable and then runs a function against that set of variables.
I've had success at getting it to work for 1 variable by using the following code snippet:
Import-Csv -Path C:\something\mylist.csv | ForEach-Object {
New-Variable -Name $_.Name -Value $_.Value -Force
}
My csv looks like this:
name,value
RegKey1,"Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\LanmanWorkstation"
Basically it's a list of registry keys each named as RegKey# and then the path of that reg key is the intended value of the variable.
I'm currently playing around with the "Test-Path" cmdlet that just prints out true/false if the passed reg-key exists and then just prints out some text based on if it found the reg key or not.
That snippet looks like so:
Test-Path $RegKey1
IF ($LASTEXITCODE=0) {
Write-Output "It worked"
}
else {
Write-Output "It didn't work"
}
This works fine however what I'm trying to achieve is for powershell to run this cmdlet against each of the lines in the csv file - basically checking each reg key in it and then doing whatever specified to it.
What I'm trying to avoid is declaring hundreds of variables for every regkey I plan on using but instead have this one function that just runs through the csv and every time it runs, it increments the number next to the variable's name - RegKey1,RegKey2,RegKey3 etc.
Let me know if there's a way to do this in powershell or a better way of approaching this altogether. I also apologize in advance if I've not provided enough info, please do let me know.

Answer 1

You need to place your if statement in the Foreach-Object loop. This will also only work, if your variable all get the same name of $RegKey. To incriment, you may use the for loop.
Import-Csv -Path C:\something\mylist.csv | ForEach-Object {
New-Variable -Name $_.Name -Value $_.Value -Force
IF (Test-Path $RegKey1) {
Write-Output "It worked"
}
else {
Write-Output "It didn't work"
}
}
The if statement returns a boolean value of $true, or $false. So theres no need to use $LastExitCode by placing the Test-Path as the condition to evaluate for.
Alternatively, you can use the Foreach loop to accomplish the same thing here:
$CSV = Import-Csv -Path C:\something\mylist.csv
Foreach($Key in $CSV.Value){
$PathTest = Test-Path -Path $Key
if($PathTest) {
Write-Output "It worked"
} else {
Write-Output "It didn't work"
}
}
By iterating(reading through the list 1 at a time) through the csv only selecting the value(Reg Path), we can test against that value by assigning its value to the $PathTest Variable, to be evaluated in your if statement just like above; theres also no need to assign it to a variable and we can just use the Test-Path in your if statement like we did above as well for the same results.