Method invocation failed because [System.Object[]] does not contain a method named 'op_Division'.

Question

Hi,

sometimes I run this script that I need to expand disks.
On Windows server 2019 I get this error:

****Method invocation failed because [System.Object[]] does not contain a method named 'op_Division'.****

+ CategoryInfo          : InvalidOperation: (op_Division:String) [], RuntimeException

+ FullyQualifiedErrorId : MethodNotFound

+ PSComputerName        : XXXX

$hdLetter="D:"
$server="XXXX"
$user = Read-Host "Enter domain\user name"
$pass = Read-Host -AsSecureString -Prompt "Enter password"
$cred = New-Object -TypeName System.Management.Automation.PSCredential -ArgumentList $user, $pass
$guestLogicalDiskNumberPartition ="Disk #1, Partition #0"

Invoke-Command -ComputerName $server -Credential $cred -ScriptBlock {

$diskNumber = $($Using:guestLogicalDiskNumberPartition).Substring($($Using:guestLogicalDiskNumberPartition).IndexOf("Disk #")+6, $($Using:guestLogicalDiskNumberPartition).IndexOf(", Partition #")-6)

Update-Disk -Number $diskNumber

$timeOut = 0

# aspetta che la configurazione sia ok

do {

    $size = Get-PartitionSupportedSize -DriveLetter $Using:hdLetter

    $sizeGB = [math]::Round($size.SizeMax / 1024 / 1024 / 1024)

    Write-Host "." -NoNewline

    $timeOut += 300

    Start-Sleep -Milliseconds 300

} until ($sizeGB -eq $Using:capacityGB -or $timeOut -gt 20000)

Resize-Partition -DriveLetter $Using:hdLetter -Size $size.SizeMax

Write-Host "!"

Write-Host "Disco espanso a: $sizeGB GB" -ForegroundColor Green

}

can someone give me some help?

Big thanks!
Regards
Faye

Answer 1

The only place I see that you use division is after the Get-SupportedPartitionSize cmdlet. The variable $size, however, shouldn't be an array.

I've added error handling to your script, and replaced the multiple "Substring" operation with a regex (it makes what you're trying to do less difficult to figure out!). I've also redirected the error stream from the Invoke-Command so it will be returned. The results of the Invoke-Command are placed into the variable $result. You should verify at the completion of the Invoke-Command that no error objects are present in that variable.

$hdLetter = "D:"
$server = "XXXX"
$user = Read-Host "Enter domain\user name"
$pass = Read-Host -AsSecureString -Prompt "Enter password"
$cred = New-Object -TypeName System.Management.Automation.PSCredential -ArgumentList $user, $pass
$guestLogicalDiskNumberPartition = "Disk #1, Partition #0"

$result = Invoke-Command -ComputerName $server -Credential $cred -ScriptBlock {
    if ($diskNumber = $Using:guestLogicalDiskNumberPartition -match "^Disk #([0-9]+?),"){ 
        $disknumber = $matches[1]
        Try{
            Update-Disk -Number $diskNumber -ErrorAction Stop
        }
        Catch{
            Throw $_      # just return the error object
        }
        $timeOut = 0
        # aspetta che la configurazione sia ok
        do {
            Try{
                $size = Get-PartitionSupportedSize -DriveLetter $Using:hdLetter -ErrorAction STOP
                if ($size -is [array]){
                    Throw "Get-PartitionSupportedSize returned multiple results!"
                }
                if (($size.SizeMax) -is [array]){
                    Throw ("Logical Disk $($Using:hdletter) has multiple partitions!")
                }
                $sizeGB = [math]::Round($size.SizeMax / 1024 / 1024 / 1024)
            }
            Catch{
                Throw $_  # just return the error object
            }
            Write-Host "." -NoNewline
            $timeOut += 300
            Start-Sleep -Milliseconds 300
        } until ($sizeGB -eq $Using:capacityGB -or $timeOut -gt 20000)      # NOTE: $capacityGB isn't defined!
        Try{
            Resize-Partition -DriveLetter $Using:hdLetter -Size $size.SizeMax -ErrorAction Stop
        }
        Catch{
            Throw $_  # just return the error object
        }
        Write-Host "!"
        Write-Host "Disco espanso a: $sizeGB GB" -ForegroundColor Green
        "Disco espanso a: $sizeGB GB"
    }
    else{
        Write-Host "Failed to find the disk number in $($Using:guestLogicalDiskNumberPartition)"
        "Failed to find the disk number in $($Using:guestLogicalDiskNumberPartition)"
    }
} 2>&1      # redirect the error stream so Invoke-Command returns not just stuff that works!
$result

Answer 2

Hi，

It seems the variable $size is an array. If what you posted is not the full script, the variable $hdLetter may be modified somewhere else. Please check if $Using:hdLetter contains multiple letters before the line $size = Get-PartitionSupportedSize -DriveLetter $Using:hdLetter.
Also the colon ":" has to be removed from $hdLetter because the DriveLetter property of the MSFT_Partition class contains only letters.

Best Regards,
Ian Xue

============================================

If the Answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.