如何在PowerShell上为每个循环并行运行

Question

我下面有一个Powershell脚本，该脚本在多个远程服务器上运行计划的任务：

Workflow Invoke-ParallelWorkflow
{
    $ListFile='server_list.txt'
    $ServerList = (get-content $ListFile) -match '^[^#\r\n].*'

    ForEach ($Server in $ServerList)
    {
        InlineScript{ Invoke-Command -ComputerName $Server -ScriptBlock { schtasks /run  /tn MM\fileOSclean }}
    }
}

Invoke-ParallelWorkflow

pause

问题是它没有读取$ Server变量的值

Invoke-Command : Cannot validate argument on parameter 'ComputerName'. The argument is null or empty. Provide an
argument that is not null or empty, and then try the command again.
At Invoke-ParallelWorkflow:15 char:15
+
    + CategoryInfo          : InvalidData: (:) [Invoke-Command], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationError,Microsoft.PowerShell.Commands.InvokeCommandCommand
    + PSComputerName        : [localhost]

如果我删除ForEach并对该服务器名称进行硬编码，则脚本将起作用：

Workflow Invoke-ParallelWorkflow
{
    parallel
    {
        InlineScript{ Invoke-Command -ComputerName ServerName1 -ScriptBlock { schtasks /run  /tn myScheduleTask }}
        InlineScript{ Invoke-Command -ComputerName ServerName2 -ScriptBlock { schtasks /run  /tn myScheduleTask }}
        InlineScript{ Invoke-Command -ComputerName ServerName3 -ScriptBlock { schtasks /run  /tn myScheduleTask }}
    }
}

Invoke-ParallelWorkflow

pause

server_list.txt具有有效的内容，我可以在ForEach命令中运行write-host $Server时将其输出