Get virtual machine names in powershell via C# (hyper-V)

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C#

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PowerShell

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I am trying to get the list of virtual machine names, from a local Hyper-V server, with the following code:

C#

string _scr = ("Get-VM | Select -ExpandProperty Name");
var _ps = PowerShell.Create();
_ps.AddScript(_scr);
Collection<PSObject> _cObj = _ps.Invoke();
foreach (PSObject _vm in _cObj)
{
    Console.WriteLine(_vm);
}

The Get-VM cmdlet should return values in string format already, but I don't get any output.

What I have tried:

I would like to get a result like the following output we get in PowerShell:

PowerShell

PS C:\> Get-VM | Select -ExpandProperty Name
VM-Name1
VM-Name2
VM-Name3
VM-Name4
PS C:\>

Can anyone help me with this please?

Thanks a million.

Ada

Posted 13-Nov-21 18:08pm

Member 14992347

Updated 17-Dec-21 4:30am

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Empty Coder · Answer 1 · 2021-12-17T04:30:00

Get-VM only works in a PowerShell session run as administrator. When I try your C# code run as an administrator it does print VM names.

When I try it without administrator rights I get no output, same as you - but there is an error reported if you check _ps.HadErrors it's true. Try this version of your code:

PowerShell

string _scr = ("Get-VM | Select -ExpandProperty Name");
var _ps = PowerShell.Create();
_ps.AddScript(_scr);
Collection<PSObject> _cObj = _ps.Invoke();

if (_ps.HadErrors) {
    Console.WriteLine(_ps.Streams.Error[0].ToString());
}

foreach (PSObject _vm in _cObj)
{
    Console.WriteLine(_vm);
}

I get "You do not have the required permission to complete this task. Contact the administrator of the authorization policy for the computer {name}", you may get another error which gives you an idea what is going wrong.

(Another consideration, if the Hyper-V module is not being autoloaded you may need Import Hyper-V; at the beginning of your PowerShell code).