Unable to load and utilize dll function in powershell script

Question

I want to delete all the files under an Azure data lake folder, and I am writing the following Powershell script to do it.

$tenantid = "xxxx-xxxxx-xxxxxxx-xxx"

$serviceprincipalid = "xxxx-xxxxxx-xxxxxxx-xxx"
$serviceprincipalkey = ConvertTo-SecureString "xxxxxxxxxxxxx" -AsPlainText -Force
$psCred = New-Object System.Management.Automation.PSCredential($serviceprincipalid,$serviceprincipalkey)

$adlspath = "/Demo/"
$accountname = "testserv01"

Login-AzureRmAccount -Credential $psCred -TenantId $tenantid -ServicePrincipal

$AllFiles = New-Object Collections.Generic.List[Microsoft.Azure.Commands.DataLakeStore.Models.DataLakeStoreItem];

$AllFiles = Get-AzureRmDataLakeStoreChildItem -AccountName $accountname -Path $adlspath

foreach($DelFiles in $AllFiles)
{
$delfilepath = $adlspath + $DelFiles.Name

Remove-AzureRmDataLakeStoreItem -AccountName $accountname -Paths $delfilepath -Force:$true
}

NOTE: I have masked certain values for security reason.

However, I am getting the following error while doing so:

$AllFiles = New-Object "System.Collections.Generic.List``1[Microsoft.Azure.Commands.DataLakeStore.Models.DataLakeStoreItem]"
New-Object : Cannot find type [System.Collections.Generic.List`1[Microsoft.Azure.Commands.DataLakeStore.Models.DataLakeStoreItem]]: make sure the assembly containing this type is loaded.

I don't see you adding the type anywhere in your code.

Maximilian Burszley
– Maximilian Burszley

2018-07-29 20:42:02 +00:00
Commented Jul 29, 2018 at 20:42 — Maximilian Burszley
– Maximilian Burszley, Commented Jul 29, 2018 at 20:42

Adam · Accepted Answer · 2018-07-29 21:39:47Z

I see a bunch of posts where folks are running the code you've got. It looks like something happened between the version of AzureRM they used and what you're using now.

On a virgin Windows 10 system, I downloaded the AzureRM module...

Install-Module -Name AzureRM
Import-Module -Name AzureRM

Then I tried to run the offending line.

New-Object Collections.Generic.List[Microsoft.Azure.Commands.DataLakeStore.Models.DataLakeStoreItem]

And, I got the following.

New-Object : Cannot find type
[Collections.Generic.List[Microsoft.Azure.Commands.DataLakeStore.Models.DataLakeStoreItem]]: verify that the assembly
containing this type is loaded.
At line:1 char:1
+ New-Object Collections.Generic.List[Microsoft.Azure.Commands.DataLake ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidType: (:) [New-Object], PSArgumentException
    + FullyQualifiedErrorId : TypeNotFound,Microsoft.PowerShell.Commands.NewObjectCommand

If I loaded the 4.2.1 AzureRM module...

Install-Module -Name AzureRM -RequiredVersion 4.2.1
Import-Module -Name AzureRM

Then I try the offending command, I don't get an error.

You have to dig a little deeper to see what changed, but as a quick and dirty fix, use an older version. Target the version of AzureRM around when the post with the code you're running was created.

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