如何将它传递给函数时展开PowerShell的数组 [英] How to expand a PowerShell array when passing it to a function

问题描述

我有两个PowerShell函数，其中第一个调用第二个。他们都取N参数，其中一人被定义为简单地添加标志和调用其他。这里有例子的定义：

I have two PowerShell functions, the first of which invokes the second. They both take N arguments, and one of them is defined to simply add a flag and invoke the other. Here are example definitions:

function inner
{
  foreach( $arg in $args )
    {
      # do some stuff
    }
}

function outer
{
  inner --flag $args
}

使用将是这个样子：

Usage would look something like this:

inner foo bar baz

或本

outer wibble wobble wubble

的目标是为后者的例子为等同于

The goal is for the latter example to be equivalent to

inner --flag wibble wobble wubble

问题：如这里所界定，后者实际上导致传递给两个参数内：第一个是--flag和第二个是包含数组维布勒，摆动和wubble。我要的是内来接受四个参数：标记和三个原始参数

The Problem: As defined here, the latter actually results in two arguments being passed to inner: the first is "--flag", and the second is an array containing "wibble", "wobble", and "wubble". What I want is for inner to receive four arguments: the flag and the three original arguments.

所以，我想知道是如何说服PowerShell的将它传递给之前扩大$ args数组内，将它作为N个元素，而不是一个单一的阵列。我相信你可以用泼洒运算符（*字符），为此在Ruby和我pretty一定的PowerShell能做到这一点，但我不记得如何。

So what I'm wondering is how to convince powershell to expand the $args array before passing it to inner, passing it as N elements rather than a single array. I believe you can do this in Ruby with the splatting operator (the * character), and I'm pretty sure PowerShell can do it, but I don't recall how.

推荐答案

有没有一个很好的解决方案，以在PowerShell中V1这个问题。在V2我们增加泼洒（尽管由于各种原因，我们用@代替*为此目的）。这里是什么样子：

There isn't a good solution to this problem in PowerSHell V1. In V2 we added splatting (though for various reasons, we use @ instead of * for this purpose). Here's what it looks like:

PS（STA-ISS）（2）>函数foo（$ X，$ Y，$ z）{X：$ X Y：$ Y Z：$ Z}

PS (STA-ISS) (2) > function foo ($x,$y,$z) { "x:$x y:$y z:$z" }

PS（STA-ISS）（3）> $ a = 1,2,3

PS (STA-ISS) (3) > $a = 1,2,3

PS（STA-ISS）（4）>富美元，单ARG通过了＃

PS (STA-ISS) (4) > foo $a # passed as single arg

X：1 2 3 Y：Z：

x:1 2 3 y: z:

PS（STA-ISS）（5）>富@a＃splatted

PS (STA-ISS) (5) > foo @a # splatted

X：1 Y：2 Z：3

x:1 y:2 z:3

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