Powershell Invoke-Expression A parameter cannot be found that matches parameter name = ""

Question

Im trying to invoke a Ps script from antoher script. The scripts are both in the same path. Also the script I'm trying to invoke takes 4 parameters.

Whem i execute that file from powershell with the parameters, then it works without errors.

But invoking it with the Invoke-Expression Command does not work. Keep getting the error :

'A parameter cannot be found that matches parameter name'

Script with the Paramters :

        param ([Parameter(Mandatory = $true)]
        [string] $Samname,
        [string] $Fullname,
        [string] $Password,
        [string] $Groups
    )    

$securePassword = ConvertTo-SecureString $Password -AsPlainText -Force

New-localuser -name $Samname -FullName $Fullname -password $securePassword -PasswordNeverExpires -UserMayNotChangePassword

#Add the User to the Groups

$localGroups = Get-LocalGroup
[string[]]$GroupArray = $Groups.Split(' ')
    foreach ($localgroup in $localGroups){

        foreach ($group in $GroupArray){

            $group = $group.Replace(';', '') 
 
        if ($group.toString().Equals($localgroup.toString())){
            Add-LocalGroupMember -Group $localgroup -Member $samname
        }
    }
}

Script with Invoke-Expression command :

$XmlDocument = 'C:\SomeFile\toPs\TmpUser.config'
[XML]$XmlFile = Get-Content $XmlDocument

[string] $Samname = $XmlFile.User.Username
[string] $Fullname = $XmlFile.User.Fullname
[string] $Password = $XmlFile.User.Password
[string] $Groups = $XmlFile.User.Groups 

$script = ".\CreateUser.ps1" 

Invoke-Expression $script "-Samname $Samname -Fullname $Fullname -Password $Password -Groups $Groups"

I'm not that sure if I'm using the params the right way, when I invoke the script.

Thanks for your help :)

Why are you using `Invoke-Expression` in the first place? Just do `& $script -Samname $Samname -Fullname $Fullname -Password $Password -Groups $Groups` — Mathias R. Jessen, Aug 12 '21 at 09:46
I don't know, i read it on google :') Now it works, thanks @MathiasR.Jessen :) — Subscaper, Aug 12 '21 at 09:51

Mathias R. Jessen · Accepted Answer · 2021-08-12T11:13:33.577

3

It's hard to tell exactly what's tripping up Invoke-Expression without the full extent of the error message, but the good news is that you don't need Invoke-Expression at all!

Use the invocation operator (also known as the "call operator", &) instead, it natively supports parameter binding:

$XmlDocument = 'C:\SomeFile\toPs\TmpUser.config'
[XML]$XmlFile = Get-Content $XmlDocument

[string] $Samname = $XmlFile.User.Username
[string] $Fullname = $XmlFile.User.Fullname
[string] $Password = $XmlFile.User.Password
[string] $Groups = $XmlFile.User.Groups 

$script = ".\CreateUser.ps1" 

& $script -Samname $Samname -Fullname $Fullname -Password $Password -Groups $Groups

edited Aug 12 '21 at 11:13

answered Aug 12 '21 at 10:19

Mathias R. Jessen

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Thx man, i didn't knowabout the invocation operator (&). I'm new to Powershell. Anway Big Thanks :) – Subscaper Aug 12 '21 at 11:05
@Subscaper Initial learning curve can be a bit steep, I suggest checking out the `about_*` help files in the documentation, specifically `about_Operators`, I've updated the answer with a link. Good luck on your PowerShell journey! :) – Mathias R. Jessen Aug 12 '21 at 11:14
Thx mate, appreciate it :) – Subscaper Aug 12 '21 at 11:23

Powershell Invoke-Expression A parameter cannot be found that matches parameter name = ""

1 Answers1