SSRS report using PowerShell Start-Job - powershell

Question

I have a PowerShell GUI that is pulling some values from a SSRS report using an String array input. However, as this would freeze the GUI, I decided to use Start-Job to start a job that pulls the SSRS report while a ProgressBar keeps running in the GUI.
The SSRS report has only one input parameter. When I use Start-Job to Render the report using multiple values, I get the result of only the first record irrespective of the number of input values.
The same function works smoothly when called natively without Start-Job returning the records for all the input values.
This is the code:
$GetSSRSData = {
param([string[]]$InputArray)
$reportServerURI = "https://<SERVER>/ReportServer/ReportExecution2005.asmx?wsdl"
$RS = New-WebServiceProxy -Class 'RS' -NameSpace 'RS' -Uri $reportServerURI -UseDefaultCredential
$RS.Url = $reportServerURI
$deviceInfo = "<DeviceInfo><NoHeader>True</NoHeader></DeviceInfo>"
$extension = ""
$mimeType = ""
$encoding = ""
$warnings = $null
$streamIDs = $null
$reportPath = "/Folder/Report"
$Report = $RS.GetType().GetMethod("LoadReport").Invoke($RS, #($reportPath, $null))
# Report parameters are handled by creating an array of ParameterValue objects.
$parameters = #()
for($i = 0; $i -lt $InputArray.Count; $i++){
$parameters += New-Object RS.ParameterValue
$parameters[$i].Name = "ParameterName"
$parameters[$i].Value = "$($InputArray[$i])"
}
# Add the parameter array to the service. Note that this returns some
# information about the report that is about to be executed.
$RS.SetExecutionParameters($parameters, "en-us") > $null
# Render the report to a byte array. The first argument is the report format.
$RenderOutput = $RS.Render('CSV',
$deviceInfo,
[ref] $extension,
[ref] $mimeType,
[ref] $encoding,
[ref] $warnings,
[ref] $streamIDs
)
$output = [System.Text.Encoding]::ASCII.GetString($RenderOutput)
return $output
}
$InputArray = #('XXXXXX', 'YYYYYY', 'ZZZZZZ', 'ABCDEF')
<#
# The below code works perfectly
$Data = GetSSRSData -InputArray $InputArray
ConvertFrom-Csv -InputObject $Data
#>
$job = Start-Job -ScriptBlock $GetSSRSData -ArgumentList $InputArray
do { [System.Windows.Forms.Application]::DoEvents() } until ($job.State -ne "Running")
$Data = Receive-Job -Job $job
Write-Host $Data # returns only the first record
When I change the bottom part as shown below, I am able to verify that the job ends after the first record is output.
$RenderOutput = $RS.Render('CSV',
$deviceInfo,
[ref] $extension,
[ref] $mimeType,
[ref] $encoding,
[ref] $warnings,
[ref] $streamIDs
)
Write-Output $RenderOutput
}
$InputArray = #('XXXXXX', 'YYYYYY', 'ZZZZZZ', 'ABCDEF')
$job = Start-Job -ScriptBlock $GetSSRSData -ArgumentList $InputArray
do {[System.Text.Encoding]::ASCII.GetString($job.ChildJobs[0].Output)} until ($job.State -ne "Running")
I also tried adding a sleep function of 5 seconds after the Render function, but it did not make any difference.
Please note that repeatedly calling the Start-Job for each input is not an option as each function call is costing a lot of time and hence the report needs to be pulled in a single call.
Why is the Render function behaving differently when started as a job? Is the function ending prematurely before it can render the other records as well?
Is there any other way such as a Runspace or a Start-ThreadJob that can solve this problem?
Ref: https://stackoverflow.com/a/63253699/4137016

Answer 1

Answer is here: ArgumentList parameter in Invoke-Command don't send all array
Probably better answer here: How do I pass an array as a parameter to another script?
Change -ArgumentList $InputArray to -ArgumentList (,$InputArray)
$InputArray = #('XXXXXX', 'YYYYYY', 'ZZZZZZ', 'ABCDEF')
$job = Start-Job -ScriptBlock $GetSSRSData -ArgumentList (,$InputArray)