PowerShell: Output provider results from multiple Azure subscriptions into one .txt file - via arrayList - azure

Question

I am trying to get the registered providers for multiple subscriptions and output everything into one file.
For that, i am getting the subscriptions from a folder full of *.yaml files that contain information about the subscriptions, including their name.
What i cannot achieve is get the result for each subscriptions into an array and output that array into a text file. The script also allows the use of only one item from the folder in case that is the case.
Here is a sample code of a subscription and the code for it:
subscription1.yaml
name: subscription1
emailContact: email.address#domain.com
tags:
- key: "key1"
value: "Value1"
subscription2.yaml
name: subscription2
emailContact: email.address#domain.com
tags:
- key: "key1"
value: "Value1"
Folder structure where the yaml files is: ./landingZones/landingzone1/settings/dev/*.yaml
script:
param (
[Parameter(Mandatory = $false)]
[string]$Environment = 'dev',
[Parameter(Mandatory = $false)]
[string]$LandingZoneType = 'landingzone1',
[Parameter(Mandatory = $false)]
[string]$SingleSubscription
)
$scriptPath = Split-Path -parent $PSCommandPath
$subscriptionsEnvironmentDirectory = Get-ChildItem -Directory $scriptPath -Recurse -Filter "*$Environment*" | Where-Object { $_.parent.parent.Name -eq $LandingZoneType }
$subscriptions = Get-ChildItem -Path $($subscriptionsEnvironmentDirectory.FullName)
foreach ($subscription in ($subscriptions | Where-Object { ([System.String]::IsNullOrEmpty($SingleSubscription)) -or ($_.Name -replace "\.[^\.]+$", '') -eq $SingleSubscription })) {
$landingZone = Get-Content -Path $subscription.FullName | ConvertFrom-Yaml
# Set subscriptionName variable
$subscriptionName = $landingZone.name
$providers = az provider list --subscription $subscriptionName | ConvertFrom-Json
$defaultRegisteredProviders = 'Microsoft.ADHybridHealthService|Microsoft.Authorization|Microsoft.Billing|Microsoft.ClassicSubscription|Microsoft.Commerce|Microsoft.Consumption|Microsoft.CostManagement|Microsoft.Features|Microsoft.MarketplaceOrdering'
$registeredProviders = $providers | Where-Object { ($_.registrationState -eq 'Registered') -and ($_.namespace -notmatch $defaultRegisteredProviders) }
# Outputting result into txt file in the same directory where the command was executed
Write-Host ('{1}# Registered providers for subscription [{0}]' -f $subscriptionName, "`n")
$list = New-Object -TypeName 'System.Collections.ArrayList'
$sortedObjects = $registeredProviders | Sort-Object namespace | `
Format-Table `
#{l = 'Namespace'; e = { $_.namespace } }, `
#{l = "Subscription Id [$subscriptionName]"; e = { $_.id } }, `
#{l = 'Registration State'; e = { $_.registrationState } }, `
#{l = 'Registration Policy'; e = { $_.registrationPolicy } }
foreach ($i in $sortedObjects) {
$list.Add($i) | Out-Null
}
# Alternative to add into array:
# #($sortedObjects).foreach({$list.Add($_)}) | Out-Null
}
$list.Count
$list | Out-File .\registered_providers.txt -Force
The result is a file called 'registered_providers.txt' that contains only the registered providers for the first subscription in the foreach loop. I cannot get the contents of the second, third and so on in the same file, just a replaced text from the $sortedObjects
How do i create the array to contain all the info from all the subscriptions called?
Thanks

Answer 1

$list | Out-File Should be inside the for loop so that all the data you are fetching will be stored in the specified file.
Out-File cmdlet has -append parameter that appends the output to the existing file for every for loop happens. Otherwise, it will clean up the information/value stored in that output file.
Thanks to #jdweng for pointing the user to the right solution.
Refer to this MS Doc on Out-File -Append Parameter usage.