Cannot convert System.Object]

I have a simple function, it is block param is defined as follows:

param (

[parameter (Position0, =

Mandatory,=$true

ValueFromPipeline=$true

( HelpMessage="VMHost Object")]

[ValidateNotNullOrEmpty()]

[VMware.VimAutomation.ViCore.Impl.V1.Inventory.VMHostImpl] $VMHost )

The feature works as expected when it is called in this way:

Get-VMHost | Test-VMHostOverCommitment

Test-VMHostOverCommitment-VMHost (Get-VMHost MyHost)

$MyHost = get-VMHost MyHost

Test-VMHostOverCommitment-VMHost $MyHost

But fails when invking as follows:

Test-VMHostOverCommitment-VMHost (Get-VMHost)

$AllHosts = get-VMHost

Test-VMHostOverCommitment-VMHost $AllHosts

This is the error:

Test-VMHostOverCommitment: cannot process the transformation parameter argument '$vmhost '. Cannot convert value "System.Object []" type "System.Object []" type 'VMware.VimAutomation.ViCore.Impl.V1.Inventory.VMHostImpl '.

Whence the System.Object []? The output of Get-VMhost is VMHostImpl objects. I can change the type of input of object as a solution, but then I lose the type of automatic type detection. I'm doing something wrong?

See you soon,.

Mike

Hi Dimitar,

Welcome to the VMware communities.

Your explanation of the problem is right. I only would set it a little different. Like this:

function Output-VMHost {
  param (
    [parameter(Position=0,
       Mandatory=$true,
       ValueFromPipeline=$true,
       HelpMessage="VMHost Object")]
    [ValidateNotNullOrEmpty()]
    [VMware.VimAutomation.ViCore.Impl.V1.Inventory.VMHostImpl[]]$VMHost)

  process {
    foreach ($ThisVMHost in $VMHost) {
      Write-Output $ThisVMHost.Name
    }
  }
}

Best regards, Robert

Tags: VMware

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