$StorageAccount = Get-AzureRmStorageAccount -ResourceGroupName $ResourceGroupName -Name $StorageAccountName

$blob = Get-AzureStorageBlob -Context $StorageAccount.Context -Container "Database name" -Blob "CreateNewPartition.xmla"

$file = $blob.ICloudBlob.DownloadText()
Invoke-ASCmd `
    -Database $AnalysisServiceDatabase `
    -InputFile $file `
    -server $AnalysisServiceServer

$memStream = New-Object System.IO.MemoryStream
$blob.ICloudBlob.DownloadToStream($memStream)
$readStream = New-Object System.IO.StreamReader($memStream, [System.Text.Encoding]::Unicode)
$memStream.Position = 0
$file = ($readStream.ReadToEnd() -replace "`0",'' | ConvertFrom-Json)

$byteArray = New-Object Byte[] $blob.Length
$file = $blob.ICloudBlob.DownloadToByteArray($byteArray, 0)