Empty powershell collection being returned from Pipeline.Invoke() in C#

[kvprasoon]

On Windows 10, in C# I am trying to call a powershell script via Pipeline.Invoke() to retrieve all the disks on a network server, for each server on a network. But can’t get it to return the data to C# when there are multiple disks on a server.

I have the following C# code:

PowerShell

foreach (var server in _collServers) { Pipeline pipeline2 = runspace.CreatePipeline(); pipeline2 = runspace.CreatePipeline(); scriptCommand = new Command(@"C:\DEV\Monitor\Monitor\bin\scripts\GetDisks.ps1"); CommandParameter commandParm = new CommandParameter("$server", server); scriptCommand.Parameters.Add(commandParm); pipeline2.Commands.Add(scriptCommand); var collDisks = pipeline2.Invoke(); foreach (var item in collDisks) { var s = item.ToString(); } }

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

foreach (var server in _collServers) { Pipeline pipeline2 = runspace.CreatePipeline(); pipeline2 = runspace.CreatePipeline(); scriptCommand = new Command(@"C:\DEV\Monitor\Monitor\bin\scripts\GetDisks.ps1"); CommandParameter commandParm = new CommandParameter("$server", server); scriptCommand.Parameters.Add(commandParm); pipeline2.Commands.Add(scriptCommand); var collDisks = pipeline2.Invoke();   foreach (var item in collDisks) { var s = item.ToString(); } }

 

which executes the following powershell script (GetDisks.ps1), with ComputerName hardcoded to a specific server for now:

PowerShell

$disks = Get-CimInstance -ClassName CIM_LogicalDisk -ComputerName SERVER01 | Where-Object { ($_.DeviceID -ge 'C') -and ($_.DriveType -eq 3)} | Select-Object DeviceID, VolumeName, Size, Freespace $disksout = [System.Collections.Generic.List[PSObject]]::New() ForEach($d in $disks) { $disk = [PSObject] @{ 'DeviceID' = $d.DeviceID 'VolumeName' = $d.VolumeName 'Size' = $d.Size 'Freespace' = $d.Freespace } $disksout.Add($disk) } $disksout

1 2 3 4 5 6 7 8 9 10 11 12 13 14

$disks = Get-CimInstance -ClassName CIM_LogicalDisk -ComputerName SERVER01 | Where-Object { ($_.DeviceID -ge 'C') -and ($_.DriveType -eq 3)} | Select-Object DeviceID, VolumeName, Size, Freespace   $disksout = [System.Collections.Generic.List[PSObject]]::New() ForEach($d in $disks) { $disk = [PSObject] @{ 'DeviceID' = $d.DeviceID 'VolumeName' = $d.VolumeName 'Size' = $d.Size 'Freespace' = $d.Freespace } $disksout.Add($disk) } $disksout

but it doesnt return a PSObjects collection into collDisks.

 

It works in the ISE (and every re-arrangement I try seems to work there).

It works if I run it for my local machine by removing -ComputerName SERVER01

PowerShell

$disks = Get-CimInstance -ClassName CIM_LogicalDisk | Where-Object { ($_.DeviceID -ge 'C') -and ($_.DriveType -eq 3)} | Select-Object DeviceID, VolumeName, Size, Freespace

1	$disks = Get-CimInstance -ClassName CIM_LogicalDisk | Where-Object { ($_.DeviceID -ge 'C') -and ($_.DriveType -eq 3)} | Select-Object DeviceID, VolumeName, Size, Freespace

It doesnt make any difference if I try using PSCustomObject instead, or creating the object collection different ways.

 

• This topic was modified 1 month, 2 weeks ago by kvprasoon. Reason: code formatting
• This topic was modified 1 month, 2 weeks ago by kvprasoon. Reason: code formatting to handle single quotes

[kvprasoon Senior Moderator Topics: 9 Replies: 1449 Points: 5,428Rank: Community MVP]

Is there any error that you can capture from pipeline2 ?

[madaw82 Participant Topics: 1 Replies: 1 Points: 11Rank: Member]

No. I checked through and couldn’t see any errors.

[Author]

Posts