ForEach-Object -Parallel 看不到已定义的 cmdlet

Question

我正在为 powershell 苦苦挣扎（第一次在这个 evn 中工作）。并发现当我尝试使用具有并行选项的 ForEach 时，循环看不到几行后定义的 cmdlet。你能给我指出任何可以帮助我解决这个问题的文档吗？在我的测试脚本和输出下面

1..10 | ForEach-Object -Parallel {
    hi $_
    sleep 2
}

function hi {
    [CmdletBinding()]
    Param (
        [Parameter(Mandatory=$true)]
        [String]$name
    )

    Begin {
        function sayHi {
            param (
                [Parameter(Position=0)]
                $name
            )

            Write-Host ">>>>"
            Write-Host "Say hi $($name)"
            Write-Host ">>>>"
        }
    }

    Process {
        hi $name
    }
    End{}
}

输出：

Desktop> .\test_paralell.ps1
hi: 
Line |
   2 |      hi $_
     |      ~~
     | The term 'hi' is not recognized as a name of a cmdlet, function, script file, or executable program.
Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
hi: 
Line |
   2 |      hi $_
     |      ~~
     | The term 'hi' is not recognized as a name of a cmdlet, function, script file, or executable program.
Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
hi:

Answer 1

当您使用 -parallel 时，幕后发生的事情是 Powershell 正在创建另一个 'namespace'，这意味着您定义的函数在此范围内不可用。你不是第一个提出这个问题的人 -> 请在这里查看示例：

ForEach-Object -Parallel 看不到已定义的 cmdlet

ForEach-Object -Parallel can't see defined cmdlet

parallel-processing

powershell

foreach