引用同一个 PSCustomObject 的另一个属性 [英] Reference another property of the same PSCustomObject

问题描述

我声明了一个 PSCustomObject 并且它有多个成员.其中一些需要相互引用.例如

I have a PSCustomObject declared and it has multiple members. Some of them need to reference each other. E.g.

$data = [PSCustomObject]@{
    a = "x"
    b = "y"
    c = "z"
    d = "$a - $b - $c"
}

我期望的是 $data.d 返回:

x - y - z

我尝试通过以下方式引用其他属性:

I've tried referencing the other properties by:

• $a
• $this.a
• $_.a
• $data.a

但这些似乎都不起作用，$data.d 的输出是:

But none of these seem to work and the output of $data.d is:

 -  -

注意:如果我们第二次运行脚本 $data.a 可能会引用上一次运行中的 $data 变量，所以我们需要确保在运行之前清除变量.

Note: if we run the script for the second time $data.a might reference the $data variable from the previous run, so we need to make sure that the variables are cleaned before running.

推荐答案

我问你是否真的在寻找 ScriptProperty:

I quess you actually looking for a ScriptProperty:

$data = [PSCustomObject]@{
    a = "x"
    b = "y"
    c = "z"
}

$data | Add-Member ScriptProperty d {"$($this.a) - $($this.b) - $($this.c)"}

$data

a b c d
- - - -
x y z x - y - z

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