Powershell function for modifying the ContentType of an object in Azure blob storage - azure

Question

I'm trying to write a function in Powershell that sets blobs in a specific container to a certain type, as they are always written with the type application/octet-stream which causes issues with downstream applications. I have written the below function but it returns the error 'ContentType' is a ReadOnly property.
I was wondering if there was any way around this? I know the property can be set manually in Azure Storage Explorer, however this is a daily task.
Function:
Function Set-ContentType {
Param (
[string]$accountName,
[string]$accessKey,
[string]$storageContainer
)
# Connect to blob storage and get blobs
$context = New-AzureStorageContext -StorageAccountName $accountName -StorageAccountKey $accessKey
$blobs = Get-AzureStorageBlob -Container $storageContainer -Context $context -Blob $fileMask
foreach ($blob in $blobs) {
if ($blob.ContentType -eq $genericMIME) {
$blob.ContentType = $targetMIME
}
}
}

Answer 1

So based on the link from the comments, please give this solution a try.
Function Set-ContentType {
Param (
[string]$accountName,
[string]$accessKey,
[string]$storageContainer
)
# Connect to blob storage and get blobs
$context = New-AzureStorageContext -StorageAccountName $accountName -StorageAccountKey $accessKey
$blobs = Get-AzureStorageBlob -Container $storageContainer -Context $context -Blob $fileMask
foreach ($blob in $blobs) {
if ($blob.ContentType -eq $genericMIME) {
$blob.Properties.ContentType = $targetMIME
$blob.SetProperties()
}
}
}

Answer 2

I have solved my own issue by writing an alternative upload script that defines the ContentType at the time of writing the blob:
Function UploadFile {
Param (
[string]$accountName,
[string]$accessKey
)
$context = New-AzureStorageContext -StorageAccountName $accountName -StorageAccountKey $accessKey
$files = Get-ChildItem $workingDir -Filter $fileMask
foreach ($file in $files) {
Set-AzureStorageBlobContent -File $file.FullName -Container $container -Properties #{"ContentType" = "$targetMIME"} -Context $context -Force
}
}