将参数传递给powershell中的脚本块

lnlaulya  于 2023-02-12  发布在  Shell
关注(0)|答案(8)|浏览(135)

我想你不能这么做

$servicePath = $args[0]

  if(Test-Path -path $servicePath) <-- does not throw in here

  $block = {

        write-host $servicePath -foreground "magenta"

        if((Test-Path -path $servicePath)) { <-- throws here.

              dowork 
        }
  }

那么我如何将变量传递给scriptblock $block呢?

lfapxunr

lfapxunr1#

Keith's answer也适用于Invoke-Command,但有一个限制,即不能使用命名参数。参数应该使用-ArgumentList参数设置,并且应该用逗号分隔。

$sb = {
    param($p1,$p2)
    $OFS=','
    "p1 is $p1, p2 is $p2, rest of args: $args"
}
Invoke-Command $sb -ArgumentList 1,2,3,4

另请参见herehere

hpcdzsge

hpcdzsge2#

脚本块只是一个匿名函数,例如,您可以在脚本块中使用$args,也可以声明一个参数块

$sb = {
  param($p1, $p2)
  $OFS = ','
  "p1 is $p1, p2 is $p2, rest of args: $args"
}
& $sb 1 2 3 4
& $sb -p2 2 -p1 1 3 4
hgtggwj0

hgtggwj03#

顺便说一句,如果使用脚本块在单独的线程(多线程)中运行:

$ScriptBlock = {
    param($AAA,$BBB) 
    return "AAA is $($AAA) and BBB is $($BBB)"
}

$AAA = "AAA"
$BBB = "BBB1234"    
$null = Start-Job $ScriptBlock -ArgumentList $AAA,$BBB

则产生:

$null = Start-Job $ScriptBlock -ArgumentList $AAA,$BBB    
Get-Job | Receive-Job
AAA is AAA and BBB is BBB1234
cmssoen2

cmssoen24#

对于任何想在远程会话脚本块中使用局部变量的阅读,从Powershell 3.0开始,您可以使用“$Using”作用域修饰符直接在脚本块中使用局部变量。

$MyLocalVariable = "C:\some_random_path\"
acl = Invoke-Command -ComputerName REMOTEPC -ScriptBlock {Get-Acl $Using:MyLocalVariable}

可在https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/invoke-command?view=powershell-7的示例9中找到

gopyfrb3

gopyfrb35#

默认情况下,PowerShell不会捕获ScriptBlock的变量。但是,您可以通过在其上调用GetNewClosure()来显式捕获变量:

$servicePath = $args[0]

if(Test-Path -path $servicePath) <-- does not throw in here

$block = {

    write-host $servicePath -foreground "magenta"

    if((Test-Path -path $servicePath)) { <-- no longer throws here.

          dowork 
    }
}.GetNewClosure() <-- this makes it work
dwthyt8l

dwthyt8l6#

三个示例语法:

$a ={ 
  param($p1, $p2)
  "p1 is $p1"
  "p2 is $p2"
  "rest of args: $args"
}
//Syntax 1:
Invoke-Command $a -ArgumentList 1,2,3,4 //PS> "p1 is 1, p2 is 2, rest of args: 3 4"
//Syntax 2:
&$a -p2 2 -p1 1 3      //PS> "p1 is 1, p2 is 2, rest of args: 3"
//Syntax 3:
&$a 2 1 3              //PS> "p1 is 2, p2 is 1, rest of args: 3"
7gcisfzg

7gcisfzg7#

我知道这篇文章有点过时了,但是我想把它作为一个可能的替代品扔掉。只是以前答案的一个微小的变化。

$foo = {
    param($arg)

    Write-Host "Hello $arg from Foo ScriptBlock" -ForegroundColor Yellow
}

$foo2 = {
    param($arg)

    Write-Host "Hello $arg from Foo2 ScriptBlock" -ForegroundColor Red
}

function Run-Foo([ScriptBlock] $cb, $fooArg){

    #fake getting the args to pass into callback... or it could be passed in...
    if(-not $fooArg) {
        $fooArg = "World" 
    }
    #invoke the callback function
    $cb.Invoke($fooArg);

    #rest of function code....
}

Clear-Host

Run-Foo -cb $foo 
Run-Foo -cb $foo 

Run-Foo -cb $foo2
Run-Foo -cb $foo2 -fooArg "Tim"
wgmfuz8q

wgmfuz8q8#

其他可能性:

$a ={ 
    param($p1, $p2)
    "p1 is $p1"
    "p2 is $p2"
    "rest of args: $args"
};
$a.invoke(1,2,3,4,5)

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