How do you add more property values to a custom object

Question

If I do this

$account = New-Object -TypeName psobject -Property @{User="Jimbo"; Password="1234"}

How do I add additional User and Password values to $account without overwriting the existing one?

I cannot pre-populate $account from a hashtable. I don't know all the users and passwords at runtime.

Answer 1

The -Property parameter of New-Object takes a hashtable as argument. You can have the properties added in a particular order if you make the hashtable ordered. If you need to expand the list of properties at creation time just add more entries to the hashtable:

$ht = [ordered]@{
  'Foo' = 23
  'Bar' = 'Some value'
  'Other Property' = $true
  ...
}

$o = New-Object -Type PSObject -Property $ht

If you need to add more properties after the object was created, you can do so via the Add-Member cmdlet:

$o | Add-Member -Name 'New Property' -Type NoteProperty -Value 23
$o | Add-Member -Name 'something' -Type NoteProperty -Value $false
...

or via calculated properties:

$o = $o | Select-Object *, @{n='New Property';e={23}}, @{n='something';e={$false}}