Cmdlet fails when using pipeline

PowerShell Help
1

I’m making a module for my company, where we doing common task with PowerShell. One of the things is to set mailbox permissions and AD permissions on a shared mailbox with just one cmdlet.

My cmdlet is called 

Add-NxMailboxPermission
and takes the 3 parameters $Identity, $User and $AutoMapping and accepts pipeline input on $Identity

If I call the cmdlet as follows:

Add-NxMailboxPermission -Identity (Get-Mailbox -Identity ) -User

it works fine.

If I use pipeline as follows:

Get-Mailbox -Identity  | Add-NxMailboxPermission -User

only the 

Add-ADPermission
part of the cmdlet is executed. No error is generated, but no Mailbox Permission is set.

I think that maybe its param $Identity that I defined as [string] but Add-MailboxPermission accepts mailboxidparameter as its Identity parameter.

My cmdlet look likes this:

function Add-NxMailboxPermission {
    [CmdletBinding(SupportsShouldProcess, ConfirmImpact='Medium')]
    param(
       [Parameter(Mandatory, ValueFromPipelineByPropertyName)]
       [string[]] $Identity,

       [Parameter(Mandatory)]
       [string]   $User,

       [ValidateNotNullOrEmpty()]
       [switch]   $AutoMapping = $true
    )

    process {
        foreach ($i in $identity) {
            if ($PSCmdlet.ShouldProcess("$i for $user", "Setting mailbox permission ('FullAccess')")) {
                try {
                    Write-Verbose "Setting mailbox permission on $i for $user"
                    Add-MailboxPermission -Identity $i -User $User -AccessRights FullAccess -AutoMapping:$AutoMapping -Confirm:$false -ErrorAction Stop

                    Write-Verbose "Setting ADPermission on $i for $user"
                    Add-ADPermission -Identity $i -User $User -Extendedrights "Send As" -Confirm:$false -ErrorAction Stop
                } catch {
                    Write-Warning "Can not set permission on $i for $user"
                }
            }
        }
    }
}

If I change line 5 to:

[Microsoft.Exchange.Configuration.Tasks.MailboxIdParameter[]] $Identity

As the same type as 

Get-MailBox
return, then I get this error:

Unable to find type [Microsoft.Exchange.Configuration.Tasks.MailboxIdParameter].
At line:8 char:14
+ ...             [Microsoft.Exchange.Configuration.Tasks.MailboxIdParamete ...
+                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (Microsoft.Excha...lboxIdParameter:TypeName) [], RuntimeException
    + FullyQualifiedErrorId : TypeNotFound

Can anyone telle me what is wrong?

Best regards

Benny

2

When you specify “ValueFromPipelineByPropertyName” the output property provided by the cmdlet should have the same name like your input parameter. I would recommend to specify an alias like “sAMAccountName” or “Name”.

BTW: What’s the difference between Identity and User? I thought that’s pretty much the same?