Powershell. Accessing variable outside a Runspace instance - wpf

Question

I wrote a small application using WPF and Runspaces and ran into some difficulties.
$Runspace = [runspacefactory]::CreateRunspace()
$Runspace.ApartmentState = "STA"
$Runspace.ThreadOptions = "ReuseThread"
$Runspace.Open()
$code = {
#Build the GUI
[xml]$xaml = #"
$xaml_code
"#
$syncHash = [hashtable]::Synchronized(#{ })
$reader = (New-Object System.Xml.XmlNodeReader $xaml)
$syncHash.Window = [Windows.Markup.XamlReader]::Load($reader)
function RunspaceScript {
param($syncHash, $Servers, $TargetBox)
$syncHash.Host = $host
$Runspace = [runspacefactory]::CreateRunspace()
$Runspace.ApartmentState = "STA"
$Runspace.ThreadOptions = "ReuseThread"
$Runspace.Open()
$Runspace.SessionStateProxy.SetVariable("syncHash", $syncHash)
$Runspace.SessionStateProxy.SetVariable("Servers", $Servers)
$Runspace.SessionStateProxy.SetVariable("TargetBox", $TargetBox)
$code = {
Function Add-OutputBoxLine {
Param ([string]$Message,[string]$Color = "Black")
$syncHash.Window.Dispatcher.invoke(
[action]{
$RichTextRange = New-Object System.Windows.Documents.TextRange($syncHash.$TargetBox.Document.ContentEnd, $syncHash.$TargetBox.Document.ContentEnd)
$RichTextRange.Text = "$Message`r`n"
$RichTextRange.ApplyPropertyValue([System.Windows.Documents.TextElement]::ForegroundProperty, "$Color")
$syncHash.$TargetBox.ScrollToCaret()
}
)
}
$syncHash.Window.Dispatcher.invoke(
[action]{ $syncHash.$TargetBox.Clear(); $syncHash.Start_Switchover.IsEnabled = $False })
if (!$az_connection) {
$az_connection = Connect-AzAccount
}
}
$PSinstance = [powershell]::Create().AddScript($Code)
$PSinstance.Runspace = $Runspace
$PSinstance.Runspace.Name = "SwitchOver"
$job = $PSinstance.BeginInvoke()
}
# Click Actions
$syncHash.Start_Switchover.Add_Click(
{
RunspaceScript -syncHash $syncHash -Servers $syncHash.Servers.Text -TargetBox "Process_Output"
})
$syncHash.Window.ShowDialog()
$Runspace.Close()
$Runspace.Dispose()
}
$PSinstance1 = [powershell]::Create().AddScript($Code)
$PSinstance1.Runspace = $Runspace
$job = $PSinstance1.BeginInvoke()
I want to access variable $az_connection which is inside a runspace which is inside a function "RunspaceScript" from previous execution of that function.
Any ideas how it can be achieved?
P.S. I was forced to remove some lines from the script code here because of the rules, don't try to copy and run the code, it will not work.

Answer 1

Probably the easiest way is to add it to $syncHash - $syncHash.AzConnection = $az_connection. Otherwise you need to return it as output from your scriptblock and then pull the output once the AsyncResult completes.
function RunspaceScript {
param($syncHash, $Servers, $TargetBox)
$syncHash.Host = $host
$Runspace = [runspacefactory]::CreateRunspace()
$Runspace.ApartmentState = 'STA'
$Runspace.ThreadOptions = 'ReuseThread'
$Runspace.Open()
$Runspace.SessionStateProxy.SetVariable('syncHash', $syncHash)
$Runspace.SessionStateProxy.SetVariable('Servers', $Servers)
$Runspace.SessionStateProxy.SetVariable('TargetBox', $TargetBox)
$code = {
Function Add-OutputBoxLine {
Param ([string]$Message, [string]$Color = 'Black')
$syncHash.Window.Dispatcher.invoke(
[action] {
$RichTextRange = New-Object System.Windows.Documents.TextRange($syncHash.$TargetBox.Document.ContentEnd, $syncHash.$TargetBox.Document.ContentEnd)
$RichTextRange.Text = "$Message`r`n"
$RichTextRange.ApplyPropertyValue([System.Windows.Documents.TextElement]::ForegroundProperty, "$Color")
$syncHash.$TargetBox.ScrollToCaret()
}
)
}
$syncHash.Window.Dispatcher.invoke(
[action] { $syncHash.$TargetBox.Clear(); $syncHash.Start_Switchover.IsEnabled = $False })
if (!$az_connection) {
$az_connection = Connect-AzAccount
}
## Output the connection from your scriptblock ##
$az_connection
## OR just add it to your synchronized hashtable ##
$syncHash.AzConnection = $az_connection
}
$PSinstance = [powershell]::Create().AddScript($Code)
$PSinstance.Runspace = $Runspace
$PSinstance.Runspace.Name = 'SwitchOver'
$job = $PSinstance.BeginInvoke()
## Wait for the $code scriptblock to finish ##
While (-not $job.IsCompleted) {
Start-Sleep -Seconds 1
}
## Pass the job to EndInvoke() to receive the output ##
$az_connection = $PSinstance.EndInvoke($job)
## Or access it from your synchronized hashtable ##
$syncHash.AzConnection
}