Validate 2 Powershell Parameters

Question

I have a PowerShell function that moves files and folders from one directory to another. I want to be able to make sure neither value for $fromFolder or $toFolder is empty or null. Not sure how it would work with two parameters.

function Move-Folders {
    gci $fromFolder -Recurse | ForEach-Object { Move-Item $_.FullName $toFolder }
    ii $toFolder
}

You create a function that does exactly the same as Move-Item. There's no need to browse with gci as you move everything without filtering so just use Move-Item, it will be more accurate. However I have provided an answer with how to validate your parameters. — Manu
– Manu, Commented Nov 10, 2017 at 14:10
Possible duplicate of Find if PowerShell argument is an empty string and prompt for input — G42
– G42, Commented Nov 10, 2017 at 14:41

Manu · Accepted Answer · 2017-11-10 14:44:53Z

2

Declare the parameters with validation attributes : about_Functions_Advanced_Parameters

function Move-Folders {
    Param
    (
        [parameter(Mandatory=$true)]
        [ValidateNotNullOrEmpty()]
        [String]
        $fromFolder,

        [parameter(Mandatory=$true)]
        [ValidateNotNullOrEmpty()]
        [String]
        $toFolder
    )

    gci $fromFolder -Recurse | ForEach-Object { Move-Item $_.FullName $toFolder }
    ii $toFolder
}

edited Nov 10, 2017 at 14:44

answered Nov 10, 2017 at 13:57

Manu

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2 Comments

Maximilian Burszley Over a year ago

For reference: they're called attributes. Also, as a code style point, I'd recommend putting each attribute above the [Type]$Declaration on its own line for readability. In some scripts I've written, I've used [ValidateScript()] or have multiple attributes where your method quickly becomes unruly.

Manu Over a year ago

I agree with you, I did one-liner because of the ValidateNotNullOrEmpty() that is simple. I edit to follow the good practice rules.

Ranadip Dutta · Accepted Answer · 2017-11-10 13:58:17Z

0

This should do your work with mandatory parameters:

function Move-Folders {
Param(
   [Parameter(Mandatory=$true)]
   $fromFolder,
   [Parameter(Mandatory=$true)]
   $toFolder

) #end param

gci $fromFolder -Recurse | ForEach-Object { Move-Item $_.FullName $toFolder }

ii $toFolder
}

answered Nov 10, 2017 at 13:58

Ranadip Dutta

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