如何创建自定义Powershell运算符? [英] How to create a custom Powershell operator?

问题描述

是否可以在Powershell中创建自定义运算符?而且，我该怎么做?我已经搜索过Google，但没有任何反应.

Is it possible to create a custom operator in Powershell? And, how would I do that? I've searched Google but nothing is coming up.

我指的是一个中缀运算符:

I'm referring to specifically an infix operator:

$ ExampleList -包含元素"

$ExampleList -contains "element"

我已经创建了cmdlet(使用Powershell和C#)，模块等，因此我只需要简单的笔触.

I've created cmdlets (with Powershell and C#), modules, etc., so I just need the broad strokes.

推荐答案

您可以创建前缀运算符，但不能创建前缀或后缀运算符，例如:

You can create a prefix operator but not an in-fix or post-fix operator e.g.:

Set-Alias ?: Invoke-Ternary
function Invoke-Ternary {
param(
    [Parameter(Mandatory, Position=0)]
    [scriptblock]
    $Condition,

    [Parameter(Mandatory, Position=1)]
    [scriptblock]
    $TrueBlock,

    [Parameter(Mandatory, Position=2)]
    [scriptblock]
    $FalseBlock,

    [Parameter(ValueFromPipeline, ParameterSetName='InputObject')]
    [psobject]
    $InputObject
)

Process {
    if ($pscmdlet.ParameterSetName -eq 'InputObject') {
        Foreach-Object $Condition -input $InputObject | Foreach {
            if ($_) {
                Foreach-Object $TrueBlock -InputObject $InputObject
            }
            else {
                Foreach-Object $FalseBlock -InputObject $InputObject
            }
        }
    }
    elseif (&$Condition) {
        &$TrueBlock
    }
    else {
        &$FalseBlock
    }
}

使用方式如下:

$toolPath = ?: {[IntPtr]::Size -eq 4} {"$env:ProgramFiles(x86)\Tools"} {"$env:ProgramFiles\Tools"}}

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