Powershell: get DHCP status with Get-NetIPConfiguration? - windows

Question

I'm a powershell newbie.
If I run Get-NetIPConfiguration -Detailed I can see the IPv4 DHCP status. This is a good start - took me a lot of googling to get this far:
PS C:\Windows\system32> Get-NetIPConfiguration -Detailed
ComputerName : VM-172-26-39-24
InterfaceAlias : Ethernet
InterfaceIndex : 6
InterfaceDescription : Red Hat VirtIO Ethernet Adapter
NetCompartment.CompartmentId : 1
NetCompartment.CompartmentDescription : Default Compartment
NetAdapter.LinkLayerAddress : FA-16-3E-FF-0D-60
NetAdapter.Status : Up
NetProfile.Name : Network
NetProfile.NetworkCategory : Public
NetProfile.IPv6Connectivity : NoTraffic
NetProfile.IPv4Connectivity : Internet
IPv6LinkLocalAddress : fe80::x:x:x:x
IPv4Address : 172.26.39.249
IPv6DefaultGateway :
IPv4DefaultGateway : 172.26.36.1
NetIPv6Interface.NlMTU : 9000
NetIPv4Interface.NlMTU : 9000
NetIPv6Interface.DHCP : Enabled
NetIPv4Interface.DHCP : Disabled
DNSServer : x.x.x.x
x.x.x.x
But if I run something like
Get-NetIPConfiguration -Detailed | select InterfaceAlias,NetIPv4Interface.DHCP
I get an empty field?
PS C:\Windows\system32> Get-NetIPConfiguration -Detailed | `
select InterfaceAlias, NetIPv4Interface.DHCP
InterfaceAlias NetIPv4Interface.DHCP
-------------- ---------------------
Ethernet
Am I doing something wrong?
If I remove the trailing .DHCP ("what's in there?") I see nothing recognisable
PS C:\Windows\system32> Get-NetIPConfiguration -Detailed | select InterfaceAlias, NetIPv4Interface
InterfaceAlias NetIPv4Interface
-------------- ----------------
Ethernet MSFT_NetIPInterface (Name = "#55?55;", CreationClassName = "", SystemCreationClassName = "", SystemName = "")

Answer 1

You need to calculate the sub property when used in a Select statement:
Get-NetIPConfiguration -Detailed | `
select InterfaceAlias, #{N="DHCP";E={$_.NetIPv4Interface.DHCP}}
Or try this:
Get-NetIPConfiguration | Select -ExpandProperty NetIPv4Interface | Select InterfaceAlias,DHCP
...or you could just retrieve the config, put it in a variable then get the desired sub-properties:
$Config = Get-NetIPConfiguration
$Config | forEach {
[pscustomobject]#{InterFaceAlias=$_.InterFaceAlias;DHCP=$_.NetIPv4Interface.DHCP}
}