Powershell参数字符串或文件 [英] Powershell parameters string or file

问题描述

我有一个脚本，希望用户能够输入字符串或使用脚本可以循环通过的文件(数组).

I have a script that i'd like the user to be able to enter a string or use a file(array) that my script can cycle through.

可以通过参数完成此操作吗?

Can this be done with a parameter?

我希望能够做这样的事情

I'd like to be able to do something like this

script.ps1 -file c:\users\joerod\desktop\listofusers.txt 

或

script.ps1 -name "john doe"

推荐答案

可以，但是您需要选择使用位置参数时要使用的默认参数集，因为这两个参数的类型都是字符串，例如:

Sure, but you will need to pick the default parameterset to use when a positional parameter is used since the type of both parameters is a string e.g.:

[CmdletBinding(DefaultParameterSetName="File")]
param(
    [Parameter(Position=0, ParameterSetName="File")]
    [string]
    $File,

    [Parameter(Position=0, ParameterSetName="Name")]
    [string]
    $Name
)

if ($psCmdlet.ParameterSetName -eq "File") {
    ... handle file case ...
}
else {
    ... must be name case ...
}

DefaultParameterSetName必不可少的地方是当有人指定此名称时:

Where the DefaultParameterSetName is essential is when someone specifies this:

myscript.ps1 foo.txt

如果指定了默认参数集名称，PowerShell将无法确定应该使用哪个参数集，因为两个位置0参数的类型均相同.没有办法消除将参数放入哪个参数的歧义.

If the default parametersetname specified, PowerShell can't tell which parameterset should be used since both position 0 parameters are the same type [string]. There is no way to disambiguate which parameter to place the argument in.

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