How to validate PowerShell Function Parameters allowing empty arrays?

Question

I have a problem similar to THIS ONE

I'm passing to a function 3 arrays and I validate object type this way

function _TEST {
[CmdletBinding()]
param (
    [parameter(mandatory=$true)]
    [array]$Path,
    [parameter(mandatory=$true)]
    [array]$RW,
    [parameter(mandatory=$true)]
    [array]$RO
)
process {
    # my code
}

It works unless I pass to function array without elements, in that case it returns this error _TEST : Cannot bind argument to parameter 'Path' because it is an empty collection.

Is there a way to solve the problem similar to [AllowEmptyString()] in linked question or do I have to write custom code to test input variable?

Richard · Accepted Answer · 2013-06-20 10:58:28Z

38

Try this:

param (
    [parameter(mandatory=$true)]
    [AllowEmptyCollection()]
    [array]$Path
)

Link:

Parameter Validation Attributes

answered Jun 20, 2013 at 10:58

Richard

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1 Comment

Naigel Over a year ago

Using this code it allows also objects different from array: _TEST @() --> no errors ; _TEST "string" --> no errors

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