convertCsvfileintoXmlonAzuredatalakestoreusingAzurePowershellrunbook

I want to convert CSV file into XML on Azure data lake store using Azure Powershell. I was using this code on Runbook of azure automation and it worked fine but No XML is being generated

$cred = Get-AutomationPSCredential -Name 'AutomationCred'
$subscriptionName = 'Pay-As-You-Go'
$null = Add-AzureRmAccount -Credential $cred
Select-AzureRmSubscription -SubscriptionName $subscriptionName | Out-Null 
$adla = "TestAzure"
$obj = Get-AzureRmDataLakeStoreItem -AccountName $adla -Path "/custom/logile/masters/Test/Test.csv" 
 $xmlobj = ConvertTo-Xml -InputObject $obj -As 'string' 
$xmlobj | Out-File -FilePath "/custom/logile/masters/Test/xmlOut.xml"

直到这里的“ $ obj = Get”，此代码才能正常工作，但是我无法写入Azure数据湖。有什么方法可以使用Object在Azure数据湖中写入文件。