How to iterate through an array of objects in Powershell

Question

I'm doing some basic validation on form fields. What's the correct way to iterate through an array of objects to validate them? When I try the below I get

The property 'BackColor' cannot be found on this object. Verify that the property exists and can be set.

I guess what I'm missing is a way of telling Powershell these are references to other variables, rather than variables themselves.

$MandatoryFields = @(
    'txtUsername',
    'txtFirst',
    'txtLast',
    'txtEmail',
    'ComboLicense'
)

ForEach ($Field in $MandatoryFields) {
    If ([string]::IsNullOrWhitespace($Field.text)) {
        $Validation = "failed"
        $Field.BackColor = "red"
    }
}

EDIT: Okay, what I needed was the actual variables in the array, like so:

$MandatoryFields = @(
    $txtUsername,
    $txtFirst,
    $txtLast,
    $txtEmail,
    $ComboLicense
)

Answer 1

Try adding your objects to an array like below

$objects = [System.Collections.ArrayList]@()

$myObject = [PSCustomObject]@{
    Name     = 'Kevin'
    Language = 'PowerShell'
    State    = 'Texas'
}


$objects.add($myObject)

$myObject1= [PSCustomObject]@{
    Name     = 'Kevin'
    Language = 'PowerShell'
    State    = 'Texas'
}


  $objects.add($myObject1)

foreach($obj in $objects){

$obj.firstname

}