By default, a PowerShell Custom Object cannot be added to another. This would be the error on each attempt:
PS C:\Windows\system32> $object1+$object2 Method invocation failed because [System.Management.Automation.PSObject] does not contain a method named 'op_Addition'. At line:1 char:1 $object1+$object2~~~~~ CategoryInfo : InvalidOperation: (op_Addition:String) [], RuntimeException FullyQualifiedErrorId : MethodNotFound --OR-- Method invocation failed because [Microsoft.PowerShell.Commands.MemberDefinition] does not contain a method named 'op_Addition'. At line:5 char:13 $combinedMembers+=get-member -InputObject $object -Member … CategoryInfo : InvalidOperation: (op_Addition:String) [], RuntimeException FullyQualifiedErrorId : MethodNotFound
Here’s a function to work around that problem:
function combineObjects($objects,$verbose=$false){
$combinedMembers=@()
foreach($object in $objects){
if($object.gettype().BaseType.Name -eq 'Object'){
$combinedMembers+=get-member -InputObject $object -MemberType NoteProperty
}else{
write-warning "This item is NOT an object:`r`n$object"
}
}
$newObject=New-Object -TypeName PSObject
foreach($property in $combinedMembers){
$propertyName=$property.Name
$value=$property.Definition -replace '^.*='
$propertyExists=$propertyName -in ($newobject|get-member).Name
if(!$propertyExists){
Add-Member -InputObject $newObject -MemberType NoteProperty -Name $propertyName -Value $value -Force
}elseif($verbose){
$previousValue=($newobject|get-member|?{$_.Name -eq $propertyName}).Definition -replace '^.*='
write-warning "$propertyName value of previous value of $previousValue has NOT been replaced with $value"
}
}
return $newObject
}
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