powershell workflow and parallel not giving output - powershell

Question

I'm using the following script and it creates the out file correctly, but it's empty. I'm not sure what it's missing exactly. This is my first attempt with using workflows.
workflow DisableIISParallel
{
$ScriptPath = "C:\Scripts\Server_Lists"
$OLD = "Legacy-Servers"
$OldList = Get-Content "$ScriptPath\$OLD.txt"
$objHost=$Records.Length
function DisableIIS ($appName) {
$objHostStr = [System.Net.Dns]::GetHostEntry([string]$objHost).HostName
Invoke-Command -ComputerName $objHostStr { iisreset /stop }
Set-Service -Name W3SVC -StartupType Disabled -Status Stopped -ComputerName $objHostStr
Get-WmiObject -Class win32_service -ComputerName $objHostStr |
where { $_.name -eq "W3SVC" } |
Format-Table -Property #{Expression={$_.PSComputerName};Label="Server";width=18},
#{Expression={$_.Name};Label="Service";width=45},
#{Expression={$_.StartMode};Label="Mode";width=10},
#{Expression={$_.State};Label="State";width=10},
#{Expression={$_.Status};Label="Status";width=10} |
Format-List | out-string -s | ? {$_} | Out-File C:\Scripts\Output\$appName.log -Append
Write-Output "" | Out-File C:\Scripts\Output\$appName.log -Append
}
foreach -parallel($objHost in $OldList)
{
$appName = $OLD
DisableIIS $appName
}
}
DisableIISParallel

Answer 1

This bit is not right:
Get-WmiObject -Class win32_service -ComputerName $objHostStr |
where { $_.name -eq "W3SVC" } |
Format-Table -Property #{Expression={$_.PSComputerName};Label="Server";width=18},
#{Expression={$_.Name};Label="Service";width=45},
#{Expression={$_.StartMode};Label="Mode";width=10},
#{Expression={$_.State};Label="State";width=10},
#{Expression={$_.Status};Label="Status";width=10} |
Format-List | out-string -s | ? {$_} | Out-File C:\Scripts\Output\$appName.log -Append
You should not run the output of one format command (Format-Table) into another format command (Format-List).
Try this (assuming you want tabular format - if not, change the Format-Table to Format-List):
Get-WmiObject -Class win32_service -ComputerName $objHostStr |
where { $_.name -eq "W3SVC" } |
Format-Table #{Expression={$_.PSComputerName};Label="Server";width=18},
#{Expression={$_.Name};Label="Service";width=45},
#{Expression={$_.StartMode};Label="Mode";width=10},
#{Expression={$_.State};Label="State";width=10},
#{Expression={$_.Status};Label="Status";width=10} >> C:\Scripts\Output\$appName.log
And pass in all the variables required to the function e.g.:
function DisableIIS ($appName, $objHost) {
...
}
foreach -parallel($objHost in $OldList)
{
$appName = $OLD
DisableIIS $appName $objHost
}