surpress output of get-azureaddomain - powershell

Question

using below snippet :
#loop until we have found the newly added domain
$Stop=''
while (-not $Stop)
{
$stop = Get-AzureADDomain -Name $direct_routing_domain -ErrorAction Ignore | Out-Null
if (!$stop)
{
Write-Host "Domain is not provisioned yet - retrying in 60 seconds..." -ForegroundColor Yellow
Start-Sleep -Seconds 60
}
}
Write-Host "Domain is provisioned " -ForegroundColor Green
The output gives an error on stdout:
Get-AzureADDomain : Error occurred while executing GetDomain
Code: Request_ResourceNotFound
...
So here comes the question: how can I surpress this output ? I believe that | out-null should be enough. Or is this a bug in AzureAd 2.0.0 module ?

Answer 1

Out-Null does not ignore errors. Out-Null redirects stdout (known as stream #1) to null. You can try doing a try catch (catch provides easy exceptions handling)
try {}
catch {}
doc. https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_try_catch_finally?view=powershell-5.1
or redirect an error stream to void
Write-Error "ASD" 2>$null
doc. https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_redirection?view=powershell-5.1

Answer 2

You can use this:
$stop = $true
try {Get-AzureADDomain -Name $direct_routing_domain}
catch {
$stop = $false
}
OR
$stop = $true
$domain = Get-AzureADDomain | Where-Object {$_.Name -eq $direct_routing_domain}
if ($null -eq $domain) {
$stop = $false
}

Answer 3

You can use a try{}..catch{} on this, but remember to add -ErrorAction Stop (not 'Ignore') to the cmdlet to ensure also non-terminating exceptions are caught in the catch block:
# loop until we have found the newly added domain
$isProvisioned = $false
while (-not $isProvisioned) {
try {
$isProvisioned = [bool](Get-AzureADDomain -Name $direct_routing_domain -ErrorAction Stop)
}
catch { $isProvisioned = $false }
if (!$isProvisioned) {
Write-Host "Domain is not provisioned yet - retrying in 60 seconds..." -ForegroundColor Yellow
Start-Sleep -Seconds 60
}
}
Write-Host "Domain is provisioned " -ForegroundColor Green