Set Environment per Runspace - vb.net

Question

I am currently working on an application that pulls tasks from a SQL table and exeutes PowerShell scripts. I want to run a SetUP.ps1 in the beginning to set variables like working dir and so on, and a tearDown.ps1 in the end just for clean up.
Currently I am using:
Using myRunSpace = RunspaceFactory.CreateRunspace
myRunSpace.Open()
Using ps = PowerShell.Create
ps.Runspace = myRunSpace
ps.AddScript("Set-ExecutionPolicy -Scope Process RemoteSigned")
ps.Invoke()
End Using
Using ps = PowerShell.Create
ps.Runspace = myRunSpace
ps.AddScript(Application.StartupPath & "\SetUp.ps1")
ps.Invoke()
End Using
Using ps = PowerShell.Create
ps.Runspace = myRunSpace
ps.AddScript(task.Script)
ReturnValue = PSSerializer.Serialize(ps.Invoke())
End Using
Using ps = PowerShell.Create
ps.Runspace = myRunSpace
ps.AddScript(Application.StartupPath & "\TearDown.ps1")
ps.Invoke()
End Using
End Using
In Setup.ps1 I a currently doing:
$env:test = Get-Random
When I now run the code above multithreaded with the snippet as code:
Start-Sleep 10; $env:test
Then all runs give me the same value. the $env:test is the same in each run. Is there a way how I can limit the scope of the $env:test to simply this one runspace?

Answer 1

I think this is what you want to accomplish: Have one thread write the random value to an environment variable, and the other thread reading it?
Remove-Item c:\test.out -force
Remove-Item Env:\test
$testfile = "c:\test.out"
$myRunSpace = [RunspaceFactory]::CreateRunspace()
$myRunSpace.Open()
$ps1 = [PowerShell]::Create()
$ps1.Runspace = $myRunSpace
$ps1.AddScript("`$env:test = Get-Random")
$ps1.Invoke()
$ps2 = [PowerShell]::Create()
$ps2.Runspace = $myRunSpace
$ps2.AddScript("Start-Sleep -Seconds 1")
$ps2.AddScript("`$env:test | Out-File $testfile")
$ps2.Invoke()
start-sleep 2
"variable set to: $env:test"
"file reads: " + (Get-Content $testfile)