需要参数之一的组参数(设置?) [英] Group parameter (set?) requiring one of the parameters

问题描述

我正在尝试设置需要三组参数之一的参数，并包括一个整数和一个冒号；

I'm trying to set up parameters where one of three set of parameters are required and include an integer followed by a colon;

-year:n  
-month:n  
-day:n

通过Microsoft Docs无法完全了解参数集，请在设置方面需要帮助.

Can't quite wrap my head around parameter sets via Microsoft Docs and need help setting this up, please.

最后，该参数将用于Robocopy的MinAge参数，如果使用-month:2，我将剔除2，乘以30.4167(月平均天数)并插入作为Robocopy参数.我有最后一部分，只是没有参数部分.

In the end the parameter will be used for Robocopy's MinAge parameter where if -month:2 is used, I'll strip out the 2, multiply by 30.4167 (average day in month) and insert /MinAge:60.8334 as the Robocopy parameter. I have the last part down, just not the parameter part.

推荐答案

我认为这可以解释一下.下面的函数使用三个参数，所有参数均具有不同的参数集名称.

I think this can explain a bit. The function below uses three parameters, all having a different parmeter set name.

function Get-MinAge {
    [CmdletBinding(DefaultParameterSetName = 'ByDays')]
    param (
        [Parameter(Mandatory = $true, ParameterSetName = 'ByYears', Position = 0)]
        [int]$Years,
        [Parameter(Mandatory = $true, ParameterSetName = 'ByMonths', Position = 0)]
        [int]$Months,
        [Parameter(Mandatory = $true, ParameterSetName = 'ByDays', Position = 0)]
        [int]$Days
    )

    switch ($PSCmdlet.ParameterSetName) {
        'ByYears'  { $minage = $Years * 365.2422 ; break}  # average year length
        'ByMonths' { $minage = $Months * 30.4167 ; break } # average month length
        'ByDays'   { $minage = $Days }
    }
    # return the parameter for robocopy
    # wrapping inside quotes makes sure your Windows locale does not change the decimal point
    '/MinAge:{0}' -f "$minage"
}

在ISE编辑器中使用此选项将仅允许使用三个参数之一. 该函数还具有DefaultParameterSetName，这意味着如果您未指定参数名称，则将使用默认设置(在本例中为"ByDays"设置).

Using this within the ISE editor will allow for only one of the three parameters. The function also has a DefaultParameterSetName, meaning that if you dont specify the parameter name, the defauld set is used (in this case the 'ByDays' set).

像这样使用它:

Get-MinAge -Years 2   --> "/MinAge:730.4844"
Get-MinAge -Months 2  --> "/MinAge:60.8334"
Get-MinAge -Days 2    --> "/MinAge:2"
Get-MinAge 2          --> "/MinAge:2"

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