PowerShell目前没有一个本地内联If(或三元If)，但你可以考虑使用自定义cmdlet:

IIf <condition> <condition-is-true> <condition-is-false>

参见:PowerShell内联If (IIf)

根据这篇PowerShell博客文章，你可以创建一个别名来定义?:operator:

set-alias ?: Invoke-Ternary -Option AllScope -Description "PSCX filter alias"
filter Invoke-Ternary ([scriptblock]$decider, [scriptblock]$ifTrue, [scriptblock]$ifFalse) 
{
   if (&$decider) { 
      &$ifTrue
   } else { 
      &$ifFalse 
   }
}

像这样使用它:

$total = ($quantity * $price ) * (?:  {$quantity -le 10} {.9} {.75})

下面是另一种自定义函数方法:

function Test-TernaryOperatorCondition {
    [CmdletBinding()]
    param (
        [Parameter(ValueFromPipeline = $true, Mandatory = $true)]
        [bool]$ConditionResult
        ,
        [Parameter(Mandatory = $true, Position = 0)]
        [PSObject]$ValueIfTrue
        ,
        [Parameter(Mandatory = $true, Position = 1)]
        [ValidateSet(':')]
        [char]$Colon
        ,
        [Parameter(Mandatory = $true, Position = 2)]
        [PSObject]$ValueIfFalse
    )
    process {
        if ($ConditionResult) {
            $ValueIfTrue
        }
        else {
            $ValueIfFalse
        }
    }
}
set-alias -Name '???' -Value 'Test-TernaryOperatorCondition'

例子

1 -eq 1 |??? 'match' : 'nomatch'
1 -eq 2 |??? 'match' : 'nomatch'

差异的解释

Why is it 3 question marks instead of 1? The ? character is already an alias for Where-Object. ?? is used in other languages as a null coalescing operator, and I wanted to avoid confusion. Why do we need the pipe before the command? Since I'm utilising the pipeline to evaluate this, we still need this character to pipe the condition into our function What happens if I pass in an array? We get a result for each value; i.e. -2..2 |??? 'match' : 'nomatch' gives: match, match, nomatch, match, match (i.e. since any non-zero int evaluates to true; whilst zero evaluates to false). If you don't want that, convert the array to a bool; ([bool](-2..2)) |??? 'match' : 'nomatch' (or simply: [bool](-2..2) |??? 'match' : 'nomatch')

PowerShell中的三元运算符是在PowerShell version7.0中引入的。

[Condition] ? (output if True) : (output if False)

例01

$a = 5; $b = 6
($a -gt $b) ? "True" : "False"

输出

False

例子02

($a -gt $b) ? ("$a is greater than $b") : ("$a is less than $b")

输出

5 is less than 6

更多的信息 https://www.tutorialspoint.com/how-ternary-operator-in-powershell-works

尝试powershell的switch语句作为替代，特别是对于变量赋值-多行，但可读。

的例子,

$WinVer = switch ( Test-Path -Path "$Env:windir\SysWOW64" ) {
  $true    { "64-bit" }
  $false   { "32-bit" }
}
"This version of Windows is $WinVer"

我能够想出的最接近PowerShell的构造是:

@({'condition is false'},{'condition is true'})[$condition]