powershell - How to loop through arrays in hash table - passing parameters based on values read from a CSV file -

curious how loop through hash table each value array. example:

 $test = @{  = "a","1";  b = "b","2";  c = "c","3";  } 

then like:

foreach ($t in $test) { write-output $t } 

expected result like:

name value    b    b c    c    1 b    2 c    3 

that's not happens , use case pass hash of parameters function in loop. approach might wrong, figured ask , see if anyone's tried this?

edit** bit more clarification. i'm trying pass lot of array values function , loop through in hash table prior passing nested function. example:

first like:

$parameters = import-csv .\newcomputers.csv 

then like

 $parameters | new-labvm 

lab vm code below:

function new-labvm  {  [cmdletbinding()] param (     # param1 description     [parameter(mandatory=$true,                position=0,                valuefrompipeline=$true,                valuefrompipelinebypropertyname=$true)]     [alias("p1")]      [string[]]$servername,      # param2 description     [parameter(position = 1)]     [int[]]$ram = 2gb,      # param3 description     [parameter(position=2)]     [int[]]$serverharddrivesize = 40gb,      # parameter description     [parameter(position=3)]     [int[]]$vmrootpath = "d:\virtualmachines",     [parameter(position=4)]     [int[]]$networkswitch = "vm switch 1",     [parameter(position=4)]     [int[]]$iso = "d:\iso\win2k12.iso"   )   process   {  new-item -path $vmrootpath\$servername -itemtype directory  $arguments = @{  name = $servername;  memorystartupbytes = $ram;  newvhdpath = "$vmrootpath\$servername\$servername.vhdx";  newvhdsizebytes = $serverharddrivesize  switchname = $networkswitch;}  foreach ($argument in $arguments){     # create virtual machines new-vm @arguments  # configure virtual machines set-vmdvddrive -vmname $servername -path $iso start-vm $servername } # create virtual machines new-vm @arguments  } } 

what you're looking parameter splatting.

the robust way via hashtables, must convert custom-object instances output import-csv hashtables:

import-csv .\newcomputers.csv | foreach-object {    # convert custom object @ hand hashtable.    $htparams = @{}    $_.psobject.properties | foreach-object { $htparams[$_.name] = $_.value }     # pass hashtable via splatting (@) target function.    new-labvm @htparams } 

note since parameter binding via splatting key-based (the hashtable keys matched against parameter names), fine use regular hashtable unpredictable key ordering (no need ordered hashtable ([ordered] @{ ... }) in case).