在powershell中，如何从“剩余"构建字符串数组.从命令行传递参数? [英] In powershell, how to build String arrays from "remaining" arguments passed from command line?

问题描述

当函数需要String数组时，在命令行上键入("arg0"，"arg1"，"arg2")是不方便的.像本例一样:

It is inconvenient to type ("arg0", "arg1", "arg2") on the command line when a function needs a String array. Like in this example:

function Exec-GradleScript(
    [Parameter(Mandatory)]String] $ScriptName
    [Parameter(Mandatory)][String[]] $ArgList
    ){
    & "$ScriptName" $ArgList
}

... -ScriptName之后的所有参数都必须使用显式数组语法.如何避免这种情况，以便我可以输入

... all the arguments after -ScriptName need to be in the explicit array syntax. How can I avoid this, so that I can type

Exec-GradleScript foo.gradle arg0 arg1 arg2

还有$ ArgList值传递给可执行文件吗?

And still have an $ArgList value to pass to the executable?

推荐答案

注意:

• 该解决方案由此答案提供，其中显示了如何使用 ValueFromRemainingArguments parameter属性，以在单个数组参数中收集所有单独的未绑定位置参数.

• The solution is provided by this answer, which shows how to use the ValueFromRemainingArguments parameter property to collect all individual unbound positional arguments in a single array parameter.

我认为您的功能已简化；如所写，在链接的答案中实现解决方案实质上使该功能变得不必要-您可以简单地调用
foo.gradle arg0 arg1 arg2 直接(假设 foo.gradle 是直接可执行的，这就是您的函数所建议的).

I presume your function is simplified; as written, implementing the solution in the linked answer essentially makes the function unnecessary - you can simply call
foo.gradle arg0 arg1 arg2 directly (assuming foo.gradle is directly executable, which is what your function suggests).

顺便说一句:使用 $ ScriptName 而不是"$ ScriptName" 就足够了，因为-与POSIX类似的外壳不同-PowerShell使您能够使用变量 unquoted ，即使它们的值包含空格或其他shell元字符(不执行所谓的shell扩展).

As an aside: It's sufficient to use $ScriptName rather than "$ScriptName", because - unlike POSIX-like shells - PowerShell allows you to use variables unquoted, even if their value contains spaces or other shell metacharacters (no so-called shell expansions are performed).

至:

当函数需要String数组时，在命令行上键入("arg0&"，"arg1"，"arg2")是不方便的.

It is inconvenient to type ("arg0", "arg1", "arg2") on the command line when a function needs a String array.

繁琐的语法("arg0&"，"arg1"，"arg2")仅在 expression 解析模式下需要.

The cumbersome syntax ("arg0", "arg1", "arg2") is only needed in expression parsing mode.

在参数解析模式下-当您将参数传递给命令时-可以使用传递数组语法-不带括号且不带引号(除非元素是包含空格或PowerShell元字符的 literal ，例如'arg 0'):

In argument parsing mode - when you pass arguments to a command - arrays can be passed using much looser syntax - without parentheses and without quoting (unless the elements are literals that contain whitespace or PowerShell metacharacters, e.g., 'arg 0'):

# No parentheses around the array, elements unquoted.
Exec-GradleScript foo.gradle  arg0, arg1, arg2

有关PowerShell的两种基本解析模式的更多信息，请参见此答案.

For more information about PowerShell's two fundamental parsing modes, see this answer.

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