如何自动更新在powershell中运行的后台作业的数量？

我在 powershell 中运行的后台作业很少，我正在尝试找到一种方法来获取作业“正在运行”和“已完成”的计数，一旦作业完成，该计数就会自动更新。

function jobDetails {
    $d = Get-Job | Measure-Object -Property Name
    Write-Output "Total Number of Jobs = " $d.Count
    $d = (Get-Job -State Running)
    Write-Output "Number of Jobs Running = " $d.count
    $d = (Get-Job -State Completed)
    Write-Output "Number of Jobs Completed = " $d.count
}

请帮助我，因为我是编码新手

这里有一些简单的东西供你实验，有很多方法可以做到。

# How many Jobs?
$testJobs = 5

[System.Collections.ArrayList] $jobs = 1..$testJobs | ForEach-Object {
    Start-Job {
        'Hello from Job {0}' -f [runspace]::DefaultRunspace.InstanceId
        # Set a Random timer between 5 and 10 seconds
        Start-Sleep ([random]::new().Next(5, 10))
    }
}

$total = $running = $jobs.Count
$completed = 0

$results = while($jobs) {
    $id = [System.Threading.WaitHandle]::WaitAny($jobs.Finished, 200)
    if($id -ne [System.Threading.WaitHandle]::WaitTimeout) {
        $jobs[$id] | Receive-Job -Wait -AutoRemoveJob
        $jobs.RemoveAt($id)
        $running = $total - ++$completed
    }

    Clear-Host

    @(
        'Total Jobs'.PadRight(15) + ': ' + $total
        'Jobs Running'.PadRight(15) + ': ' + $running
        'Jobs Completed'.PadRight(15) + ': ' + $completed
    ) | Write-Host
}

$results | Format-Table

你也可以使用Write-Progress:

$total = $running = $jobs.Count
$completed = 0

$results = while($jobs) {
    $id = [System.Threading.WaitHandle]::WaitAny($jobs.Finished, 200)
    if($id -ne [System.Threading.WaitHandle]::WaitTimeout) {
        $jobs[$id] | Receive-Job -Wait -AutoRemoveJob
        $jobs.RemoveAt($id)
        $running = $total - ++$completed
    }

    $progress = @{
        Activity = 'Waiting for Jobs'
        Status   = 'Remaining Jobs {0} of {1}' -f $running, $total
        PercentComplete = $completed / $total * 100
    }
    Write-Progress @progress
}

$results | Format-Table

这个答案显示出类似的，更发达的替代方案，使用一个函数来等待有进度的作业和一个可选的TimeOut范围。