Workflow error "unexpected Token" - powershell

Question

I have the workflow below and I ge the error whenever I try to put it inside a workflow.
If I take it out of a workflow it works, I was wondering if there's some incorrect syntax I'm missing or even if this is not allowed n a workflow.
Apologies but my knowledge on workflows is limited (as you can probably tell). I'm ultimately trying to get the VMs to boot up in parallel.
workflow Set-AzureRmTags-and-Start {
[CmdletBinding()]
Param(
[Parameter(Mandatory=$True)]
[string]$VmRG
)
$Start = Get-Date
Write-Output "Time is" $Start
$VmRGs = Get-AzureRmResourceGroup | Where-Object { $_.ResourceGroupName -like "*$VmRG*" }
foreach ($VmRG in $VmRGs) {
$VMs = Get-AzureRmVM -ResourceGroupName $VmRG.ResourceGroupName
ForEach ($vm in $vms) {
$tags2 = $_.Tags
$tags2 ['ShutdownSchedule_AllowStop'] = "$False";
}
Set-AzureRmResource -ResourceName $vm.Name -ResourceGroupName $vm.ResourceGroupName -ResourceType "Microsoft.Compute/virtualMachines" -Tag $tags2 -Force -Verbose
}
$Middle = Get-Date
Write-Output "Time Taken To Assign Tags" ($Middle - $Start).Minutes "Minutes"
ForEach -Parallel ($vm in $vms) {
Start-AzureRmVM -Name $vm.Name -ResourceGroupName $vm.ResourceGroupName -Verbose -Confirm:$false
}
$End = Get-Date
Write-Output "Time Taken To Start VMs" ($End - $Middle).Minutes "Minutes"
Write-Output "Total Time Taken" ($End - $Start).Minutes "Minutes"
}
The error is around ['ShutdownSchedule_AllowStop'] = "$False"; } Error "Unexpected Token in Expression or Statement".
Any ideas how I could correct this?
Thanks in advance.

Answer 1

$VmRGs = Get-AzureRmResourceGroup | Where-Object { $_.ResourceGroupName -like "*$VmRG*" }
foreach ($VmRG in $VmRGs) {
$VMs = Get-AzureRmVM -ResourceGroupName $VmRG.ResourceGroupName
ForEach ($vm in $vms) {
$tags2 = $_.Tags
$tags2 ['ShutdownSchedule_AllowStop'] = "$False";
}
Set-AzureRmResource -ResourceName $vm.Name -ResourceGroupName $vm.ResourceGroupName -ResourceType "Microsoft.Compute/virtualMachines" -Tag $tags2 -Force -Verbose
}
The line $tags2 = $_.Tags does not makes sense. There is no $_ at this point.
I don't have any experience in Azure tags, but the documentation here contains sample code that your code should more closely emulate. Setting tags in their samples always seems to use a HashTable construct, like #{ShutdownSchedule_AllowStop=$false}
This section seems relevant to what you're trying to accomplish:
To add tags to a resource group that has existing tags, retrieve the
existing tags, add the new tag, and reapply the tags:
$tags = (Get-AzureRmResourceGroup -Name examplegroup).Tags
$tags += #{Status="Approved"}
Set-AzureRmResourceGroup -Tag $tags -Name examplegroup
Up until now, I've never looked into workflows. After a little testing and a bit of research, it seems the 'unexpected Token' error is due the code existing in a workflow:
function Test-ArraySubscriptFn {
$tags2 = #{}
$tags2['asdf'] = $false
}
workflow Test-ArraySubscriptWf {
$tags2 = #{}
$tags2['asdf'] = $false # error: Only variable names may be used as the target of an assignment statement
$tags2.Add('asdf',$false) # error: Method invocation is not supported in a Windows Powershell Workflow...
$tags2 += #{'asdf'=$false} # no error
}
This is consistent with google search results. I guess we both need to do a bit of research on how workflows differ from 'regular' powershell scripts.