PowerShell 7.3 - Difficulty with Parallel Processing in ForEach-Object Using -Parallel
I'm dealing with I'm trying to speed up a script that processes a large number of files by leveraging the `ForEach-Object -Parallel` feature introduced in PowerShell 7. However, I'm working with issues with variable scope. My script reads multiple JSON files from a directory, processes each file to extract certain attributes, and then writes the results to a new file. When I try to use `-Parallel`, the processed data appears to be inconsistent or sometimes empty, and I'm not sure how to properly handle shared variables. Here’s my current code: ```powershell $results = @() $path = 'C:\Data\JSONFiles\*json' Get-ChildItem -Path $path | ForEach-Object -Parallel { $content = Get-Content -Path $_.FullName | ConvertFrom-Json $processed = [PSCustomObject]@{ Name = $content.Name Value = $content.Value } # Attempting to add to the shared results array $using:results += $processed } -ThrottleLimit 4 $results | Export-Csv -Path 'C:\Data\ProcessedResults.csv' -NoTypeInformation ``` When I run this code, I often get an empty results file or only partial data. I'm aware that variables declared outside the `-Parallel` script block are not directly accessible, but I thought that using `$using:` would allow me to reference them correctly. I’ve also tried using a synchronous `ForEach-Object` loop, and it worked fine, but it’s way too slow for my needs. The behavior messages I see are often related to variable assignments being null or not propagating properly. How can I resolve the scope issues while still achieving the performance benefits of parallel processing? This is part of a larger web app I'm building. Hoping someone can shed some light on this.