Need to create a foreach loop for a CSV file, using 2 variables, in Powershell

I am new to coding and most of my experience is with Python. I am working on a simple powershell script that runs a Test-NetConnection on IP address and ports in a CSV file.

Each IP needs to be tested with each Port

What I have so far is this, not sure if I need to create a new list with each IP/Port combination, and then run a foreach on them:

$csv_path = Read-Host -Prompt "Enter file path"

$csv = Import-Csv -Path "$csv_path"

foreach($item in $csv){
    "{0} = {1}" -f $item.IP,$item.Port
    Test-NetConnection -ComputerName "$item.IP" -Port "$item.Port" -InformationLevel Detailed
}

PowerShell has a handy feature called Member-Access Enumeration that you can use here.

In short, if you access a property or method on an array object (for example your $csv variable) it will invoke that property or method on all items in the array and return a new array with the all results in it.

For example with this test data:

PS> $csv = @"
IP,      Port
1.1.1.1, 22
1.1.1.2, 25
1.1.1.3, 80
1.1.1.4,
"@ | ConvertFrom-Csv

if you invoke $csv.IP you get an array of all the IP properties:

PS> $csv.IP
1.1.1.1
1.1.1.2
1.1.1.3
1.1.1.4

and the same for $csv.Port:

PS> $csv.Port
22
25
80

(note that the "Port" output has 4 items in it - there's a non-printing $null in the fourth index)

We can use this to do a nested loop over all the combinations of IP and Port like this:

# use member-access enumeration to get ip and port arrays,
# and filter out $null or empty string values
$ips   = $csv.IP | where-object { $_ }
$ports = $csv.Port | where-object { $_ }

foreach( $ip in $ips )
{
    foreach( $port in $ports )
    {

        "{0} = {1}" -f $ip, $port
        Test-NetConnection -ComputerName $ip -Port $port -InformationLevel Detailed

    }
}