Object within a hashtable - object

Question

I'm trying to put objects in a hashtable. I'm not getting errors but cannot access the data.
$Level1Hashtable = #{}
$Level2Object = New-Object System.Object
$Level2Object | Add-Member -MemberType NoteProperty -Name Name -Value "abc"
$Level2Object | Add-Member -MemberType NoteProperty -Name IpAddress -Value "192.168.1.1"
$Level1Hashtable.Add("Test1",$Level2Object)
$Level2Object = New-Object System.Object
$Level2Object | Add-Member -MemberType NoteProperty -Name Name -Value "123"
$Level2Object | Add-Member -MemberType NoteProperty -Name IpAddress -Value "192.168.1.1"
$Level1Hashtable.Add("Test2",$Level2Object)
$Level1Hashtable.Test1.IpAddress

Answer 1

This kind of redundant instantiation doesn't really impress me, so I went a slightly different route:
$Servers =
#{
"DC1" = [pscustomobject]#{ FQDN = "dc1.ad.foobar.com"; IpAddress = "192.168.2.1"}
"DC2" = [pscustomobject]#{ FQDN = "dc2.ad.foobar.com"; IpAddress = "192.168.2.2"}
"STS" = [pscustomobject]#{ FQDN = "sts.ad.foobar.com"; IpAddress = "192.168.2.3"}
}
Then you can also access elements very easily:
Servers["DC1"].IpAddress = "192.168.2.4"
Tested on PowerShell Core (aka PowerShell 6), works like a charm. Cheers.

Answer 2

That works for me using V4. Running in V2 it doesn't work, but does if I switch from using System.Object to PSObject for the object type in the New-Object cmdlets.
$Level1Hashtable = #{}
$Level2Object = New-Object PSObject
$Level2Object | Add-Member -MemberType NoteProperty -Name Name -Value "abc"
$Level2Object | Add-Member -MemberType NoteProperty -Name IpAddress -Value "192.168.1.1"
$Level1Hashtable.Add("Test1",$Level2Object)
$Level2Object = New-Object PSObject
$Level2Object | Add-Member -MemberType NoteProperty -Name Name -Value "123"
$Level2Object | Add-Member -MemberType NoteProperty -Name IpAddress -Value "192.168.1.1"
$Level1Hashtable.Add("Test2",$Level2Object)
$Level1Hashtable.Test1.IpAddress

Answer 3

Depending on the version of PowerShell you're using Add-Member had an issue (v1 and maybe v2) where you had to use -PassThru and reassign to the original object e.g.:
$Level2Object = $Level2Object | Add-Member NoteProperty Name abc -PassThru
In V3 you can create this more simply like so:
$Level2Object = [pscustomobject]#{Name='abc';IpAddress='192.168.1.1'}
In V2 you can use the Property parameter on new-object to simplify as well:
$Level2Object = new-object psobject -property #{Name='abc';IpAddress='192.168.1.1'}