powershell - Write to external array inside a running powershell job

Question

I am trying to write data to external array while running a powershell job-

This is my code sample that I' m trying-

$datafromJob = @()
$wmijobs = @()
foreach ($c in $computers) {
    $wmijobs += Start-Job -Name WMIInventory -ScriptBlock {
        $jobdata = get-wmiobject -ComputerName $args[0] -Class win32_computersystem -Credential $Cred -ErrorVariable Err -ErrorAction SilentlyContinue
        if ($Err.length) {
            Add-content -Path D:\InventoryError.log -Force -Value $Err
            $details = @{
                Domain       = "Error"
                Manufacturer = "Error"
                Computer     = $args[0]
                Name         = "Error"
            }
            $args[3] += New-Object PSObject -Property $details
        }
        if ($jobdata.length) {
            $details = @{
                Domain       = $jobdata.Domain
                Manufacturer = $jobdata.Manufacturer
                Computer     = $args[2]
                Name         = $jobdata.Name
            }
            $args[3] += New-Object PSObject -Property $details
        }
        -ArgumentList $c, $Cred, "Test", $datafromJob
    }
}

Expecting Output in $datafromJob Variable, but the end of job and loop variable is empty, M not getting how it will work, anyhelp,

Do let me know if any queries on this question

标签： powershellparallel-processingbackground-processget-wmiobjectpowershell-jobs

Answer 1

线程作业在技术上是可行的，但在您的情况下可能效果不佳。数组不是线程安全的。

$a = 1,2,3
start-threadjob { $b = $using:a; $b[0] = 2 } | receive-job -wait -auto
$a

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3

嗯，从这里底部的字典集合的线程安全更新：https ://devblogs.microsoft.com/powershell/powershell-foreach-object-parallel-feature/

$threadSafeDictionary =
[System.Collections.Concurrent.ConcurrentDictionary[string,object]]::new()

Get-Process | ForEach-Object -Parallel {
    $dict = $using:threadSafeDictionary
    $dict.TryAdd($_.ProcessName, $_)
}

$threadSafeDictionary["pwsh"]

“并发包”：

$threadSafeArray =
[System.Collections.Concurrent.ConcurrentBag[object]]::new()

1..10 | foreach-object -parallel { 
    $array = $using:threadSafeArray
    $array.Add($_)
} 

$threadSafeArray

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