将值传递给PowerShell。退出事件操作

Question

I'm new to powershell scripting so maybe I've just missed something. The script log changes in file system to file and also starting & finishing script.

$logPath = "C:\temp\watcher.log"
Register-EngineEvent -SourceIdentifier PowerShell.Exiting -MessageData $logPath -Action {
    $timeStamp = $Event.TimeGenerated.ToString("s")
    Out-File -FilePath $Event.MessageData -Append -InputObject "$timeStamp    Finished"
}

Passing values in IO.FileSystemWatcher events works great. But value in PowerShell.Exiting event doesn't pass. What's wrong?

Answer 1

This doesn't directly answer your question but may serve as a work-around. This is how I do this:

$historyPath = Join-Path (split-path $profile) "history-$(Get-Date -f o).clixml"
Register-EngineEvent -SourceIdentifier powershell.exiting -SupportEvent -Action {
    Get-History | Export-Clixml $historyPath
}.GetNewClosure()

Using GetNewClosure() the scriptblock can capture the value of the external $historyPath variable