Why does my script ignore values in variable only some of the time?

Question

Hello,
I'm a beginner at Powershell and am writing a script to gather the deployment details on all Azure Cloud Services attached to a Azure Subscription, including the info for any service that does not have a deployment.  
I understand that the way I'm going about this may be wrong and I am NOT looking for any help creating a final script.  Some of my script is written specifically so that I can better understand what it's doing (for learning purposes).
What I am looking for is help understand why my current script behaves the way it does.
Here's my current script:
#Create a report that shows the created date and latest deployment date for all
#hosted services (cloud services)deployments in MyAzureSubscription
Select-AzureSubscription MyAzureSubscription
$ServiceNames = Get-azureservice
foreach ($service in $ServiceNames){
$ServiceName = $service | select -ExpandProperty ServiceName
$ServiceDateModified = $service | select -ExpandProperty DateModified
$service |
get-azuredeployment -ErrorAction SilentlyContinue -ErrorVariable NoDeployment |
Select @{Name="ServiceName";Expression={$ServiceName}}, DeploymentName, Status, CreatedTime, LastModifiedTime, @{Name="ServiceDateModified";Expression={$ServiecDateModified}}, @{Name="NoDeployment";Expression={$NoDeployment}} |
Sort-Object -Propert DeploymentName |
export-csv "outputfile.csv" -notypeinformation -append
#Test statements below
#Write-Host "NoDeployment Below:"
#$Service | select ServiceName | Write-Host
#Write-Error $NoDeployment
Write-Host $ServiceName
The output file only contains a list of servicenames and deployment details for services that do have a deployment.  None of the services that have no deployments are added/exported to the csv file.  However, the "write-host $ServiceName"
writes ALL the service names in the powershell window, regardless of whether there's a deployment or not.
What I don't understand is why the Select @{Name="ServiceName";Expression={$ServiceName}} only outputs the service names of services that have deployments instead of ALL service names regardless of whether they have a deployment or not.
I've already proven that the variable $ServiceName does, at some point, save the ServiceName into the $ServiceName variable by writing it to host on each iteration of the foreach loop.  So why is it ignoring some ServiceNames when outputting/exporting
to the csv file?
Thanks!

Answer 1

Hi Landshrkk,
The script only outputs the names of the services that have deployments, because the get-azuredeployment cmdlet encounter error and didn't pass the result to select cmdlet, please try the script below:
$output=@()
Select-AzureSubscription MyAzureSubscription
$ServiceNames = Get-azureservice
foreach ($service in $ServiceNames){
$ServiceName = $service | select -ExpandProperty ServiceName
$ServiceDateModified = $service | select -ExpandProperty DateModified
$s=$service |get-azuredeployment -ErrorAction SilentlyContinue -ErrorVariable NoDeployment
$output += New-Object PSObject -Property @{
ServiceName = $ServiceName
DeploymentName = $s.DeploymentName
Status = $s.Status
CreatedTime = $s.CreatedTime
LastModifiedTime = $s.LastModifiedTime
ServiceDateModified = $ServiecDateModified
NoDeployment = $NoDeployment}
$output|Sort-Object -Propert DeploymentName |export-csv "outputfile.csv" -notypeinformation
If there is anything else regarding this issue, please feel free to post back.
Best Regards,
Anna Wang
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