PowerShell - 如何添加私人成员? [英] PowerShell - how to add private members?

问题描述

在 PowerShell (v2) 中，如何向 PSObject 添加私有成员?

In PowerShell (v2), how do you add private members to a PSObject?

也就是说，只能在 ScriptProperty 或 ScriptMethod 中通过 $this 访问的成员.

That is, members that can only be accessed via $this from within a ScriptProperty or ScriptMethod.

推荐答案

在引入 类 在 5.0 版中，PowerShell 扩展类型系统 (ETS) 没有与底层类型系统 (.NET/CTS) 相同的访问修饰符概念.

Prior to the introduction of classes in version 5.0, the PowerShell extended type system (ETS) doesn't have the same concept of access modifiers as the underlying type system (.NET/CTS) has.

向用户暗示不要直接使用它"的一种方法是为内部"属性添加前缀，例如 __(双下划线):

One way of hinting at "don't use this directly" to users, would be to have a prefix for "internal" properties, like __ (double underscore):

$object = New-Object psobject -Property @{
    Public    = 4
    __private = 9
} |Add-Member -MemberType ScriptProperty -Name Private -Value {
    $this.__private 
  } -SecondValue { 
    param([int]$newValue) 

    if(($newValue % 3) -ne 0){
      Write-Warning "Only multiples of 3 allowed"
    } else {
      $this.__private = $newValue
    }
} -PassThru

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