powershell - 嵌套变量问题

Question

该脚本是不言自明的，但我不知道如何使其工作。我想弄清楚如何将变量$ComputerPath传递给函数，并在该脚本中设置$ComputerPath

Function CheckPath {
    While (!$args[0]) {
        Write-Host "`nVariable Undefined"
        $Args[0] = Read-Host "Enter Valid Path"
    } 
    while (!(test-path $Args[0])) {
        Write-Host "Unable To Location Files, Please Check Again."
        $args[0] = Read-Host "Enter Valid Path"
    }
}

$ComputersPath = "missingfile.txt"

$ComputersPath
CheckPath $ComputersPath
$ComputersPath

我的结果

PS Z:\Powershell Scripting\Test Lab> .\TestFunction.ps1
missingfile.txt
Unable To Location Files, Please Check Again.
Enter Valid Path: log.txt
missingfile.txt
PS Z:\Powershell Scripting\Test Lab>

Answer 1

尝试将变量传递给这样的函数:

CheckPath $ComputersPath

Powershell将单引号中的 $视为文字“美元符号”，而不是变量限定符

并更改这些行:

$args[0] = Read-Host "Enter Valid Path"
CheckPath

在

CheckPath (Read-Host "Enter Valid Path")

编辑:

试试这个:

Function CheckPath {    
    IF (!$args[0]) {    
        Write-Host
        Write-Host "Variable Undefined"
        $args[0] = Read-Host "Enter Valid Path"
    }
    else
    {
      "Found"
      $global:ComputersPath  = $args[0]
    }

IF (!(Test-Path ($Args[0]))) {
    Write-Host
    Write-Host "Unable To Location Files, Please Check Again."
    CheckPath (Read-Host "Enter Valid Path")
}

}

编辑:

要设置您在函数中使用的任何变量，我举一个例子:

function test 
{   
    $myvar = $MyInvocation.line.split(' ')[1].replace('$','')    
    "`$$myvar value now is $($args[0])"

    Invoke-Expression  "`$global:$myvar = 'yahoo'"    

    "{0} value now is {1}" -f "`$$myvar", (invoke-expression "`$$myvar")
}

在您可以尝试以下方法之后:

PS C:\ps> $a="google" #or whatever variable you want...
PS C:\ps> test $a
$a value now is google
$a value now is yahoo
PS C:\ps> $a
yahoo

现在，您可以在此函数中使用代码，并根据目标逻辑输入 CheckPath function