Issue with multiple values in Powershell variable

Question

Hello All.

I'm currently facing an issue while running a DNS PS cmdlet trying to extract the current two dns servers set for an specific nic card and comparing them to a variable

Here's the variable:

$Variable1 = "10.99.1.4","10.99.1.3"

And here's the little piece of code:

Variable2 = (Get-DnsClientServerAddress -AddressFamily IPv4 | where "InterfaceAlias" -match "Main")

For variable2, I'm getting the following:

$Variable2.ServerAddresses

10.99.1.4
10.99.1.3

for variable1 within the script, I get the same results:

$Variable1

10.99.1.4
10.99.1.3

When I compare the two variables with the following code, I'm getting that they are different and I cannot find why (I should be getting an "OK" output):

If ($Variable2.ServerAddresses -eq $Variable1) {Write-Output "Main NIC DNS ORDER --> OK!"} else {Write-Output "Main NIC DNS ORDER --> FAILED (x)"}

MAIN NIC DNS ORDER --> FAILED (x)

I've already tried the following:

setting variable1 as a system string as the following:

[string []] $Variable1 = "10.99.1.4","10.99.1.3"

Spliting with commas :

$Variable1'10.99.1.4,10.99.1.3' -split ','

using -match instead of -eq

but no luck so far.

Any ideas??

Thx a lot

Answer 1

Arrays are not strings. :-)

$Variable1 = "10.99.1.4","10.99.1.3"  
$Variable2 = [PSCustomObject]@{ServerAddresses = @('10.99.1.4','10.99.1.3')}    # array elements in the same order as $Variable1  
$Variable3 = [PSCustomObject]@{ServerAddresses = @('10.99.1.3','10.99.1.4')}    # array elements in a dufferent order to $Variable1  
  
# Compare variables 1 and 2  
if ($null -eq (Compare-Object -ReferenceObject $Variable1 -DifferenceObject $Variable2.ServerAddresses -IncludeEqual | Where-Object {$_.SideIndicator -ne '=='})){  
    "The two arrays are equal"  
}  
else{  
    "The two arrays are not equal"  
}  
  
# Compare variables 1 and 3  
if ($null -eq (Compare-Object -ReferenceObject $Variable1 -DifferenceObject $Variable3.ServerAddresses -IncludeEqual | Where-Object {$_.SideIndicator -ne '=='})){  
    "The two arrays are equal"  
}  
else{  
    "The two arrays are not equal"  
}  
  

Answer 2

Try this:

$Control = "10.99.1.4","10.99.1.3"  
$Variables = @( [PSCustomObject]@{ServerAddresses = @('10.99.1.4','10.99.1.3')},                # array elements in the same order as $Control  
                [PSCustomObject]@{ServerAddresses = @('10.99.1.3','10.99.1.4')},                # array elements in a different order to $Control  
                [PSCustomObject]@{ServerAddresses = @('10.99.1.3','10.99.1.9')},                # array elements different to $Control  
                [PSCustomObject]@{ServerAddresses = @('10.99.1.3','10.99.1.4','10.99.1.9')}     # different number of array elements to $Control  
              )  
  
$ControlCount = 0  
if ($Control -is [array]){  
    $ControlCount = $Control.Count  
}  
else{  
    Throw "`$Control is not an array"  
}  
  
foreach ($v in $Variables){  
    if ($v.ServerAddresses -is [Array]){  
            if ($v.ServerAddresses.Count -ne $ControlCount){  
                Write-Warning "Different array sizes"  
                Continue  
            }  
    }  
    for ($i=0; $i -le ($ControlCount - 1); $i++){  
        if ($Control[$i] -ne $v.ServerAddresses[$i]){  
            Write-Warning "Array elements differ, or array element orders are different"  
            Break  
        }  
    }  
}