Why ForEach-Object doesn't work for AzureRM cmdlet

Question

I am trying to execute a very simple cmdlet but it doesn't work

$resources = Get-AzureRMResourceGroup | % { Get-AzureRMResource -ResourceGroupName $_.ResourceGroupName}

$resources

The error message being thrown is as follows

Get-AzureRmResource : Parameter set cannot be resolved using the
specified named parameters. At line:1 char:45
+ ... Group | % { Get-AzureRMResource -ResourceGroupName $_.ResourceGroupNa ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (:) [Get-AzureRmResource], Para meterBindingException
+ FullyQualifiedErrorId : AmbiguousParameterSet,Microsoft.Azure.Commands.R
esourceManager.Cmdlets.Implementation.GetAzureResourceCmdlet

Answer 1

-ResourceGroupName is part of a parameter set which means that if used it must be included along with the other mandatory parameters that belong to its set.

Documentation here shows two parameter sets with that parameter is used.

#Parameter Set: Get resource by name and group
Get-AzureRmResource [-ApiVersion <System.String> ] [-ExpandProperties] [-ExtensionResourceName <System.String> ] [-ExtensionResourceType <System.String> ] [-IsCollection] [-ODataQuery <System.String> ] [-Pre] [-ResourceGroupName <System.String> ] [-ResourceName <System.String> ] [ <CommonParameters>]

#Parameter Set: Get resource by name, group and type
Get-AzureRmResource -ResourceGroupName <System.String> -ResourceName <System.String> -ResourceType <System.String> [-ApiVersion <System.String> ] [-ExpandProperties] [-ExtensionResourceName <System.String> ] [-ExtensionResourceType <System.String> ] [-ODataQuery <System.String> ] [-Pre] [ <CommonParameters>]

Based on the parameters used in your script it cannot determine which set to use.

Either Add more parameters to your command to narrow down which set to use.

Example 1: Get a resource

This command gets a resource of the type microsoft.web/sites, named ContosoWebsite under ResourceGroup11.

Windows PowerShell

PS C:\> Get-AzureRmResource -ResourceType "microsoft.web/sites" -ResourceGroupName "ResourceGroup11" -ResourceName "ContosoWebsite"

OR

use a set that takes parameters where the scope is narrower

For example:

Get-AzureRmResourceGroup returns an object like this

PS C:\> Get-AzureRmResourceGroup

ResourceGroupName : xxxxxxxxxxxxxxxxx
Location          : xxxxxxxxxxxx
ProvisioningState : Succeeded
Tags              : 
ResourceId        : /subscriptions/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/resourceGroups/xxxxxxxxxxxxxxxxxxx

You could try passing the ResourceId to the next cmdlet.

#Parameter Set: Get a single resource by its Id.
Get-AzureRmResource -ResourceId <String> [-ApiVersion <System.String> ] [-ExpandProperties] [-ODataQuery <System.String> ] [-Pre] [ <CommonParameters>]

You command would then look like this:

$resources = Get-AzureRMResourceGroup | % { Get-AzureRMResource -ResourceId $_.ResourceId}

$resources