Using property names from a CSV in foreach - powershell

Question

I am trying to import a CSV containing information on a large amount of users and computers. I am using this CSV to build my Active Directory. I am trying to build the computers and am having an issue with the foreach loops and I believe I may be misunderstanding them. Here is the relevant section of my code:
$adusercsv = Import-CSV .\tst.csv
foreach ($_.computername in $adusercsv)
{
if ($_.city -eq "Vancouver")
{
New-ADComputer -Name $_.computername -Path OU=Computers,OU=Vancouver,DC=VANDC
}
if ($_.city -eq "Calgary")
{
New-ADComputer -Name $_.computername -Path OU=Computers,OU=Calgary,DC=InternalCAL
}
}
This code throws the syntax error:
At line:21 char:12
+ foreach ($_.computername in $adusercsv)
+ ~
Missing 'in' after variable in foreach loop.
At line:21 char:39
+ foreach ($_.computername in $adusercsv)
+ ~
Unexpected token ')' in expression or statement.
+ CategoryInfo : ParserError: (:) [], ParentContainsErrorRecordException
+ FullyQualifiedErrorId : MissingInInForeach
How do I read each line from the array?

Answer 1

First off, the $_ is the default variable representing the current object in the pipeline. You are trying to assign the current computer to the computername property of an undefined variable... try this instead
$OUs = #{
Vancouver = 'OU=Computers,OU=Vancouver,DC=VANDC'
Calgary = 'OU=Computers,OU=Calgary,DC=InternalCal'
}
$aduserscsv = Import-CSV .\tst.csv
foreach ($row in $aduserscsv) {
New-ADComputer -Name $row.Computername -path $OUs.($row.city)
}
This has no error checking in, which would be advisable, but it demonstrates how you use the foreach (){} loop and how you don't need to check the property of the city if your values are in your source data

Answer 2

$_ is used for the current value in the pipeline. In this case, you should not use it.
Try this out:
adusercsv = Import-CSV .\tst.csv
foreach ($computer in $adusercsv)
{
if ($computer.city -eq "Vancouver")
{
New-ADComputer -Name $computer.computername -Path OU=Computers,OU=Vancouver,DC=VANDC
}
if ($computer.city -eq "Calgary")
{
New-ADComputer -Name $computer.computername -Path OU=Computers,OU=Calgary,DC=InternalCAL
}
}

Answer 3

Have a look on this page for an example.
You can try like this :
$adusercsv = Import-CSV .\tst.csv
foreach ($pc in $adusercsv)
{
if ($pc.city -eq "Vancouver")
{
New-ADComputer -Name $pc.computername -Path OU=Computers,OU=Vancouver,DC=VANDC
}
if ($pc.city -eq "Calgary")
{
New-ADComputer -Name $pc.computername -Path OU=Computers,OU=Calgary,DC=InternalCAL
}
}