Using PowerShell Add-Member Fails

Question

Why does the following error appear below the script?

"Add-Member: it is not possible to process the command because of one or several missing
required parameters: InputObject.
+ $ Obj = Add-Member <<<-MemberType NoteProperty -Name ComputerName -Value $ Computer_name
    + CategoryInfo: InvalidArgument: (:) [Add -Member], ParameterBindingException
    + FullyQualifiedErrorId: MissingMandatoryParameter, Microsoft.PowerShell.Commands.AddMemberCommand "

Script

# Receives the computer name and stores the required results in $obj.
Function WorkerNetworkAdaptMacAddress {
    Param($ComputerName)

    $colItems = GWMI -cl "Win32_NetworkAdapterConfiguration" -name "root\CimV2" -comp $ComputerName -filter "IpEnabled = TRUE"
    $obj = New-Object -TypeName PSobject
    ForEach ($objItem in $colItems)
    {
        $obj = Add-Member -MemberType NoteProperty -Name ComputerName -Value $ComputerName
        $obj = Add-Member -MemberType NoteProperty -Name MacAddress -Value $objItem.MacAddress
        $obj = Add-Member -MemberType NoteProperty -Name IPAdress -Value $objitem.IpAddress
    }
    Write-Output $obj
}

# Receives the computer name and passes it to WorkerNetworkAdaptMacAddress.

Function Get-NetworkAdaptMacAddress {
    begin {}
    process{
        WorkerNetworkAdaptMacAddress -computername $_
    }
    end {}
}

# Passes a computer name to get-networkAdaptMacAddress
'tbh00363' | Get-NetworkAdaptMacAddress

Answer 1

Try it like this:

$objcol = @()
ForEach ($objItem in $colItems)
{
    $obj = New-Object System.Object
    $obj | Add-Member -MemberType NoteProperty -Name ComputerName -Value $ComputerName
    $obj | Add-Member -MemberType NoteProperty -Name MacAddress -Value $objItem.MacAddress
    $obj | Add-Member -MemberType NoteProperty -Name IPAdress -Value $objitem.IpAddress
    $objcol += $obj
}
Write-Output $objcol

Answer 2

PSObject . , .

-, Add-Member, . , InputObject. , , PassThru Add-Member:

ForEach ($objItem in $colItems)
{
    $obj = New-Object -TypeName PSobject
    Add-Member -InputObject $obj -MemberType NoteProperty -Name ComputerName -Value $ComputerName
    Add-Member -InputObject $obj -MemberType NoteProperty -Name MacAddress -Value $objItem.MacAddress
    Add-Member -InputObject $obj -MemberType NoteProperty -Name IPAddress -Value $objitem.IpAddress -PassThru
}

New-Object's -Property :

Get-WmiObject Win32_NetworkAdapterConfiguration -ComputerName $ComputerName -Filter "IpEnabled=TRUE" | Foreach-Object {
    New-Object -TypeName PSobject -Property @{
        ComputerName=$ComputerName
        MacAddress=$_.MacAddress
        IPAddress=$_.IpAddress
    }
}

Select-Object:

Get-WmiObject ... | Select-Object @{n='ComputerName';e={$_.__SERVER}},MacAddress,IpAddress

Answer 3

, , Add-Member.
, , , -PassThru:

PassThru, Add-Member . .

script:

$obj = $objItem | Add-Member -MemberType NoteProperty -Name ComputerName -Value $ComputerName -PassThru

, , :

$obj | Add-Member -MemberType NoteProperty -Name ComputerName -Value $ComputerName

Answer 4

Enrico, Shay Christian, , Add-Member, Add-Member, InputObject. , Add-Member, PassThru, InputObject .

ForEach ($objItem in $colItems) {
  $obj = New-Object PSobject
  $obj | Add-Member -MemberType NoteProperty -Name ComputerName -Value $ComputerName -PassThru ` 
       | Add-Member -MemberType NoteProperty -Name MacAddress -Value $objItem.MacAddress -PassThru `
       | Add-Member -MemberType NoteProperty -Name IPAdress -Value $objitem.IpAddress -PassThru
}

Answer 5

You assign the result to a Add-Membervariable without adding it to the collection of properties within $obj.

Instead

$obj = Add-Member -MemberType NoteProperty -Name ComputerName -Value $ComputerName

Try the following:

Add-Member -MemberType NoteProperty -Name ComputerName -Value $ComputerName -inputObject $obj